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<h3>
Sebastian Graf pushed to branch wip/T17676
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/0cd21aef3a23de4ec0ae21e7fc8f9904758c7554">0cd21aef</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-03-19T16:02:23Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">A bunch of fixes involving the new Divergence lattice
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<h4>6 changed files:</h4>
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<li class="file-stats">
<a href="#11ffe98a94d798427bc600e4fcfe899407536346">
compiler/GHC/Core/SimpleOpt.hs
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<li class="file-stats">
<a href="#10828b99499a9ef1e9839b007762c68994bcb036">
compiler/basicTypes/Demand.hs
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<li class="file-stats">
<a href="#2c842f2f15e67826dc12cc363525b56acb7b7882">
compiler/basicTypes/Id.hs
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<li class="file-stats">
<a href="#32cfa1d436eed1ea5106ea7f4f67090c60a01ed1">
compiler/simplCore/SetLevels.hs
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<li class="file-stats">
<a href="#ea6c99f43a7d52025b4dfaf7a7822038a54a9a84">
compiler/stranal/DmdAnal.hs
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<li class="file-stats">
<a href="#fefba0bb63e2af077c91206052f9c20caa85d3c7">
compiler/stranal/WwLib.hs
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<h4>Changes:</h4>
<li id="11ffe98a94d798427bc600e4fcfe899407536346">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/0cd21aef3a23de4ec0ae21e7fc8f9904758c7554#11ffe98a94d798427bc600e4fcfe899407536346"><strong>compiler/GHC/Core/SimpleOpt.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -39,7 +39,7 @@ import Var ( isNonCoVarId )</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">VarSet</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">VarEnv</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</span></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Demand</span><span class="p">(</span> <span class="n" style="color: #333;">eta<span class="idiff left right">Expand</span>StrictSig</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Demand</span><span class="p">(</span> <span class="n" style="color: #333;">eta<span class="idiff left right">Convert</span>StrictSig</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion.Opt</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">optCoercion</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="k" style="font-weight: 600;">hiding</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">substTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendTvSubst</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendCvSubst</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendTvSubstList</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isInScope</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">substTyVarBndr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cloneTyVarBndr</span> <span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -764,7 +764,7 @@ joinPointBinding_maybe bndr rhs</td>
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764
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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">str_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"> <span class="n" style="color: #333;">str_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">bndrs</span> <span class="c1" style="color: #998; font-style: italic;">-- Strictness demands are for Ids only</span></span>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"> <span class="n" style="color: #333;">join_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">asJoinId</span><span class="p">`</span> <span class="n" style="color: #333;">join_arity</span></span>
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767
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<pre style="margin: 0;">-<span id="LC767" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdStrictness</span><span class="p">`</span> <span class="n" style="color: #333;">eta<span class="idiff left right">Expand</span>StrictSig</span> <span class="n" style="color: #333;">str_arity</span> <span class="n" style="color: #333;">str_sig</span></span>
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdStrictness</span><span class="p">`</span> <span class="n" style="color: #333;">eta<span class="idiff left right">Convert</span>StrictSig</span> <span class="n" style="color: #333;">str_arity</span> <span class="n" style="color: #333;">str_sig</span></span>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">join_bndr</span><span class="p">,</span> <span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/0cd21aef3a23de4ec0ae21e7fc8f9904758c7554#10828b99499a9ef1e9839b007762c68994bcb036"><strong>compiler/basicTypes/Demand.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -22,9 +22,8 @@ module Demand (</td>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addCaseBndrDmd</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">dmdTypeDepth</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lubDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bothDmdType</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emptyDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkDmdType</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addDemand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ensureArgs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BothDmdArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkBothDmdArg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toBothDmdArg</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emptyDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addDemand</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emptyDmdEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">peelFV</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findIdDemand</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -35,12 +34,13 @@ module Demand (</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emptySig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cprProdSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isTopSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hasDemandEnvSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitStrictSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">strictSigDmdEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">increaseStrictSigArity</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">etaExpand</span>StrictSig</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">prependArgsStrictSig</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">etaConvert</span>StrictSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">seqDemand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">seqDemandList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">seqDmdType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">seqStrictSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">evalDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cleanEvalDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cleanEvalProdDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isStrictDmd</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitDmdTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitFVs</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mayThrowPreciseException</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">deferAfterPreciseException</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">postProcessUnsat</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">postProcessDmdType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitProdDmd_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">peelCallDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">peelManyCalls</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCallDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCallDmds</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -209,8 +209,9 @@ as if we had</td>
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> other -> return ()</span></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So the 'y' isn't necessarily going to be evaluated.</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The function that spots this situation is</span></span>
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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'CoreUtils.exprMayThrowPreciseException', and</span></span>
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To detect this scenario, why we track precise exceptions in the Divergence</span></span>
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lattice. Specifically, if 'foo' throws an exception, the Divergence in its</span></span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strictness signature will indicate so (ExnOrDiv or Dunno), in which case</span></span>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'Demand.deferAfterPreciseException' will lub with the strictness analysis</span></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">results of the virtual branch.</span></span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -221,16 +222,9 @@ A more complete example (#148, #1592) where this shows up is:</td>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, we want to defer, because @when (...) (exitWith ExitSuccess)@ might throw</span></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a precise exception.</span></span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, consider</span></span>
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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x s = case getMaskingState# s of</span></span>
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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (# s, r #) -></span></span>
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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case x of I# x2 -> ...</span></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here it is terribly sad to make 'f' lazy in 'x'. After all,</span></span>
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<pre style="margin: 0;">-<span id="LC230" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">getMaskingState# is not going throw a precise exception! And</span></span>
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<pre style="margin: 0;">-<span id="LC231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'exprMayThrowPreciseException' recognises that.</span></span>
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<pre style="margin: 0;">-<span id="LC232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This situation actually arises in GHC.IO.Handle.Internals.wantReadableHandle</span></span>
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<pre style="margin: 0;">-<span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(on an MVar not an Int), and made a material difference.</span></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that Dunno is still the top of the lattice, hence we need a new element</span></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that denotes absence of precise exception, but still allows for convergence.</span></span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That element is ConOrDiv.</span></span>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Scenario 2: Precise exceptions in case alternatives</span></span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">---------------------------------------------------</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -245,8 +239,9 @@ The solution is to give 'raiseIO#' 'topDiv' instead of 'botDiv', so that its</td>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'Demand.defaultFvDmd' is lazy. But then the simplifier fails to eliminate a lot</span></span>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of dead code, namely when 'raiseIO#' occurs in a case scrutinee. Hence we need</span></span>
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to give it 'exnDiv', which was conceived entirely for this reason. The default</span></span>
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<pre style="margin: 0;">-<span id="LC248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">demand of 'exnDiv' is lazy, but otherwise (in terms of 'Demand.isBotDiv') it</span></span>
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">behaves exactly as 'botDiv', so that dead code elimination works as expected.</span></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">FV demand of 'exnDiv' is lazy, its default arg dmd is absent, but otherwise (in</span></span>
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">terms of 'Demand.isBotDiv') it behaves exactly as 'botDiv', so that dead code</span></span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">elimination works as expected.</span></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"><span class="cd">-- | Vanilla strictness domain</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1004,9 +999,9 @@ data Divergence</td>
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<pre style="margin: 0;"> <span id="LC999" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Might diverge, throw any kind of exception or converge.</span></span>
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<pre style="margin: 0;"> <span id="LC1000" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"><span class="n" style="color: #333;">lubDivergence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span><span class="kt" style="color: #458; font-weight: 600;">Divergence</span></span>
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<pre style="margin: 0;">-<span id="LC1008" class="line" lang="haskell"><span class="n" style="color: #333;">lubDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span> <span class="n" style="color: #333;"><span class="idiff left">r</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">r</span></span></span>
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<pre style="margin: 0;">-<span id="LC1009" class="line" lang="haskell"><span class="n" style="color: #333;">lubDivergence</span> <span class="n" style="color: #333;"><span class="idiff left">r</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Diverges</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">r</span></span></span>
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"><span class="n" style="color: #333;">lubDivergence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span><span class="idiff left right"> </span><span class="kt" style="color: #458; font-weight: 600;">Divergence</span></span>
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"><span class="n" style="color: #333;">lubDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span> <span class="n" style="color: #333;"><span class="idiff left">div</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">div</span></span></span>
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"><span class="n" style="color: #333;">lubDivergence</span> <span class="n" style="color: #333;"><span class="idiff left">div</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Diverges</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">div</span></span></span>
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<pre style="margin: 0;"> <span id="LC1005" class="line" lang="haskell"><span class="n" style="color: #333;">lubDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">ExnOrDiv</span> <span class="kt" style="color: #458; font-weight: 600;">ExnOrDiv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExnOrDiv</span></span>
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<pre style="margin: 0;"> <span id="LC1006" class="line" lang="haskell"><span class="n" style="color: #333;">lubDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">ConOrDiv</span> <span class="kt" style="color: #458; font-weight: 600;">ConOrDiv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ConOrDiv</span></span>
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<pre style="margin: 0;"> <span id="LC1007" class="line" lang="haskell"><span class="n" style="color: #333;">lubDivergence</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1016,10 +1011,17 @@ lubDivergence _ _ = Dunno</td>
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span></span>
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Asymmetry of 'both' for DmdType and Divergence]</span></span>
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<pre style="margin: 0;">-<span id="LC1019" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span></span>
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<pre style="margin: 0;">-<span id="LC1020" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">ExnOrDiv</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExnOrDiv</span></span>
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<pre style="margin: 0;">-<span id="LC1021" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">ConOrDiv</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lubDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span> <span class="n" style="color: #333;">r</span> <span class="c1" style="color: #998; font-style: italic;">-- strip convergence!</span></span>
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<pre style="margin: 0;">-<span id="LC1022" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lubDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">ExnOrDiv</span> <span class="n" style="color: #333;">r</span> <span class="c1" style="color: #998; font-style: italic;">-- strip convergence!</span></span>
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The result</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * may throw a precise exception if /either/ result does</span></span>
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1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * may converge if /both/ results do</span></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Hence this is a bit complicated. Amazingly, by sheer coincidence this</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- corresponds to rotating the lattice by 90° to the left (so that ExnOrDiv is</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Top and ConOrDiv is Bot) and computing the least upper bound!</span></span>
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1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">ConOrDiv</span> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="n" style="color: #333;">div</span> <span class="kt" style="color: #458; font-weight: 600;">ConOrDiv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span></span>
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1024
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<pre style="margin: 0;">+<span id="LC1024" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExnOrDiv</span></span>
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1023
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"></span>
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1024
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1025
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1027
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'b'</span> <span class="c1" style="color: #998; font-style: italic;">-- for (b)ottom</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1145,16 +1147,13 @@ We</td>
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<pre style="margin: 0;"> <span id="LC1147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. take the demand on arguments from the first argument</span></span>
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<pre style="margin: 0;"> <span id="LC1148" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3. combine the termination results, as in bothDivergence.</span></span>
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<pre style="margin: 0;"> <span id="LC1149" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1148" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">What should be the semantics of 'bothDivergence'? Note that we can only "fall</span></span>
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<pre style="margin: 0;">-<span id="LC1149" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">through" from the left to the right argument when the left argument might</span></span>
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1150
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<pre style="margin: 0;">-<span id="LC1150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">converge. Similarly, the whole expression can only converge when /both/</span></span>
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1151
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<pre style="margin: 0;">-<span id="LC1151" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">arguments can converge. Thus:</span></span>
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<pre style="margin: 0;">-<span id="LC1152" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- When the left argument 'isBotDiv': We return that result, because there is no</span></span>
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<pre style="margin: 0;">-<span id="LC1153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> possibility to fall through to the second argument.</span></span>
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<pre style="margin: 0;">-<span id="LC1154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- Otherwise, we return the 'lubDivergence', with a twist: If the right argument</span></span>
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<pre style="margin: 0;">-<span id="LC1155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> also 'isBotDiv', we surely won't converge.</span></span>
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<pre style="margin: 0;">-<span id="LC1156" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1157" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But note that the argument demand types are not guaranteed to be observed in</span></span>
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1151
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<pre style="margin: 0;">+<span id="LC1151" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">left to right order. For example, analysis of a case expression will pass the</span></span>
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<pre style="margin: 0;">+<span id="LC1152" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">demand type for the alts as the left argument and the type for the scrutinee as</span></span>
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<pre style="margin: 0;">+<span id="LC1153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the right argument. Also, it is not at all clear if there is such an order;</span></span>
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<pre style="margin: 0;">+<span id="LC1154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">consider the LetUp case, where the RHS might be forced at any point while</span></span>
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<pre style="margin: 0;">+<span id="LC1155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">evaluating the let body. Therefore, it is crucial that 'bothDivergence' behaves</span></span>
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<pre style="margin: 0;">+<span id="LC1156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">symmetrically!</span></span>
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1158
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<pre style="margin: 0;"> <span id="LC1157" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1159
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1158
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<pre style="margin: 0;"> <span id="LC1158" class="line" lang="haskell"></span>
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1160
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<pre style="margin: 0;"> <span id="LC1159" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Equality needed for fixpoints in DmdAnal</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1166,13 +1165,15 @@ instance Eq DmdType where</td>
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1166
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<pre style="margin: 0;"> <span id="LC1165" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Unique order, it is the same order for both</span></span>
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1167
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<pre style="margin: 0;"> <span id="LC1166" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">ds1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">ds2</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">div1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">div2</span></span>
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1168
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<pre style="margin: 0;"> <span id="LC1167" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1168" class="line" lang="haskell"><span class="cd">-- | Compute the least upper bound of two 'DmdType's elicited /by the same</span></span>
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1169
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<pre style="margin: 0;">+<span id="LC1169" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- incoming demand/!</span></span>
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1169
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<pre style="margin: 0;"> <span id="LC1170" class="line" lang="haskell"><span class="n" style="color: #333;">lubDmdType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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1170
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<pre style="margin: 0;"> <span id="LC1171" class="line" lang="haskell"><span class="n" style="color: #333;">lubDmdType</span> <span class="n" style="color: #333;">d1</span> <span class="n" style="color: #333;">d2</span></span>
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1171
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<pre style="margin: 0;"> <span id="LC1172" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">lub_fv</span> <span class="n" style="color: #333;">lub_ds</span> <span class="n" style="color: #333;">lub_div</span></span>
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1172
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1173
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<pre style="margin: 0;"> <span id="LC1173" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1173
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1174
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<pre style="margin: 0;"> <span id="LC1174" class="line" lang="haskell"> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">max</span> <span class="p">(</span><span class="n" style="color: #333;">dmdTypeDepth</span> <span class="n" style="color: #333;">d1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">dmdTypeDepth</span> <span class="n" style="color: #333;">d2</span><span class="p">)</span></span>
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1174
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<pre style="margin: 0;">-<span id="LC1174" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fv1</span> <span class="n" style="color: #333;">ds1</span> <span class="n" style="color: #333;">r1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e<span class="idiff left right">nsureArgs</span></span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">d1</span></span>
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1175
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<pre style="margin: 0;">-<span id="LC1175" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fv2</span> <span class="n" style="color: #333;">ds2</span> <span class="n" style="color: #333;">r2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e<span class="idiff left right">nsureArgs</span></span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">d2</span></span>
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1175
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<pre style="margin: 0;">+<span id="LC1175" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fv1</span> <span class="n" style="color: #333;">ds1</span> <span class="n" style="color: #333;">r1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e<span class="idiff left right">taExpandDmdType</span></span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">d1</span></span>
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1176
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<pre style="margin: 0;">+<span id="LC1176" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fv2</span> <span class="n" style="color: #333;">ds2</span> <span class="n" style="color: #333;">r2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e<span class="idiff left right">taExpandDmdType</span></span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">d2</span></span>
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1176
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1177
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<pre style="margin: 0;"> <span id="LC1177" class="line" lang="haskell"></span>
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1177
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1178
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<pre style="margin: 0;"> <span id="LC1178" class="line" lang="haskell"> <span class="n" style="color: #333;">lub_fv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">plusVarEnv_CD</span> <span class="n" style="color: #333;">lubDmd</span> <span class="n" style="color: #333;">fv1</span> <span class="p">(</span><span class="n" style="color: #333;">defaultFvDmd</span> <span class="n" style="color: #333;">r1</span><span class="p">)</span> <span class="n" style="color: #333;">fv2</span> <span class="p">(</span><span class="n" style="color: #333;">defaultFvDmd</span> <span class="n" style="color: #333;">r2</span><span class="p">)</span></span>
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1178
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1179
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<pre style="margin: 0;"> <span id="LC1179" class="line" lang="haskell"> <span class="n" style="color: #333;">lub_ds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipWithEqual</span> <span class="s" style="color: #d14;">"lubDmdType"</span> <span class="n" style="color: #333;">lubDmd</span> <span class="n" style="color: #333;">ds1</span> <span class="n" style="color: #333;">ds2</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1191" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1192" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1191,7 +1192,7 @@ only passing the relevant information.</td>
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1191
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1192
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<pre style="margin: 0;"> <span id="LC1192" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">BothDmdArg</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span><span class="p">)</span></span>
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1192
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1193
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<pre style="margin: 0;"> <span id="LC1193" class="line" lang="haskell"></span>
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1193
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1194
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<pre style="margin: 0;"> <span id="LC1194" class="line" lang="haskell"><span class="n" style="color: #333;">mkBothDmdArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">BothDmdArg</span></span>
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<pre style="margin: 0;">-<span id="LC1194" class="line" lang="haskell"><span class="n" style="color: #333;">mkBothDmdArg</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">env</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Dunno</span></span><span class="p">)</span></span>
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1195
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<pre style="margin: 0;">+<span id="LC1195" class="line" lang="haskell"><span class="n" style="color: #333;">mkBothDmdArg</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">env</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">conDiv</span></span><span class="p">)</span></span>
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1195
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1196
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<pre style="margin: 0;"> <span id="LC1196" class="line" lang="haskell"></span>
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1196
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1197
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<pre style="margin: 0;"> <span id="LC1197" class="line" lang="haskell"><span class="n" style="color: #333;">toBothDmdArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">BothDmdArg</span></span>
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1197
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1198
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<pre style="margin: 0;"> <span id="LC1198" class="line" lang="haskell"><span class="n" style="color: #333;">toBothDmdArg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fv</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">fv</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1252" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1251,13 +1252,15 @@ mkDmdType fv ds res = DmdType fv ds res</td>
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1251
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1252
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<pre style="margin: 0;"> <span id="LC1252" class="line" lang="haskell"><span class="n" style="color: #333;">dmdTypeDepth</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;"> <span id="LC1253" class="line" lang="haskell"><span class="n" style="color: #333;">dmdTypeDepth</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ds</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">ds</span></span>
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<pre style="margin: 0;"> <span id="LC1254" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1254" class="line" lang="haskell"><span class="cd">-- | This makes sure we can use the demand type with n arguments.</span></span>
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<pre style="margin: 0;">-<span id="LC1255" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It appends the argument list with the correct defaultArgDmd.</span></span>
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<pre style="margin: 0;">-<span id="LC1256" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It also adjusts the Divergence: 'Diverges'survives additional arguments.</span></span>
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<pre style="margin: 0;">-<span id="LC1257" class="line" lang="haskell"><span class="n" style="color: #333;">ensureArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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<pre style="margin: 0;">-<span id="LC1258" class="line" lang="haskell"><span class="n" style="color: #333;">ensureArgs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">depth</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;">-<span id="LC1259" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">depth</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">inc_fv</span> <span class="n" style="color: #333;">inc_ds</span> <span class="n" style="color: #333;">inc_div</span></span>
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<pre style="margin: 0;">-<span id="LC1260" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decreaseArityDmdType</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;">+<span id="LC1255" class="line" lang="haskell"><span class="cd">-- | This makes sure we can use the demand type with n arguments after eta</span></span>
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<pre style="margin: 0;">+<span id="LC1256" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expansion, where n must not be lower than the demand types depth.</span></span>
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<pre style="margin: 0;">+<span id="LC1257" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It appends the argument list with the correct 'defaultArgDmd'.</span></span>
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<pre style="margin: 0;">+<span id="LC1258" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It also adjusts the Divergence: 'ConOrDiv' turns into 'Dunno'.</span></span>
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<pre style="margin: 0;">+<span id="LC1259" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandDmdType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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<pre style="margin: 0;">+<span id="LC1260" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandDmdType</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;">+<span id="LC1261" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">depth</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;">+<span id="LC1262" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">depth</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">inc_fv</span> <span class="n" style="color: #333;">inc_ds</span> <span class="n" style="color: #333;">inc_div</span></span>
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<pre style="margin: 0;">+<span id="LC1263" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"etaExpandDmdType: arity decrease"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">d</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1264" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">depth</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdTypeDepth</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;"> <span id="LC1265" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fv</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;"> <span id="LC1266" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1274,7 +1277,8 @@ ensureArgs n d | n == depth = d</td>
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1277
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<pre style="margin: 0;"> <span id="LC1277" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">div</span></span>
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1278
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"></span>
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1276
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1279
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<pre style="margin: 0;"> <span id="LC1279" class="line" lang="haskell"><span class="cd">-- | A conservative approximation for a given 'DmdType' in case of an arity</span></span>
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1277
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<pre style="margin: 0;">-<span id="LC1277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- decrease:</span></span>
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1280
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<pre style="margin: 0;">+<span id="LC1280" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- decrease (meaning we have to adjust the 'DmdType' for a weaker incoming</span></span>
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<pre style="margin: 0;">+<span id="LC1281" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- call demand):</span></span>
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1282
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<pre style="margin: 0;"> <span id="LC1282" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1279
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<pre style="margin: 0;"> <span id="LC1283" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Demands on FVs must be zapped, because they were computed for a</span></span>
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<pre style="margin: 0;"> <span id="LC1284" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- stronger incoming demand.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1304,6 +1308,20 @@ splitDmdTy :: DmdType -> (Demand, DmdType)</td>
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<pre style="margin: 0;"> <span id="LC1308" class="line" lang="haskell"><span class="n" style="color: #333;">splitDmdTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fv</span> <span class="p">(</span><span class="n" style="color: #333;">dmd</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">dmds</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">dmd</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fv</span> <span class="n" style="color: #333;">dmds</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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1305
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<pre style="margin: 0;"> <span id="LC1309" class="line" lang="haskell"><span class="n" style="color: #333;">splitDmdTy</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">defaultArgDmd</span> <span class="n" style="color: #333;">res_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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1306
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1310
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<pre style="margin: 0;"> <span id="LC1310" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1311" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When e is evaluated after executing an IO action that may throw a precise</span></span>
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<pre style="margin: 0;">+<span id="LC1312" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- exception, and d is e's demand, then what of this demand should we consider?</span></span>
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<pre style="margin: 0;">+<span id="LC1313" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * We have to kill all strictness demands (i.e. lub with a lazy demand)</span></span>
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<pre style="margin: 0;">+<span id="LC1314" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * We can keep usage information (i.e. lub with an absent demand)</span></span>
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<pre style="margin: 0;">+<span id="LC1315" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * We have to kill definite divergence</span></span>
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<pre style="margin: 0;">+<span id="LC1316" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Precise exceptions and strictness analysis]</span></span>
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<pre style="margin: 0;">+<span id="LC1317" class="line" lang="haskell"><span class="n" style="color: #333;">deferAfterPreciseException</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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<pre style="margin: 0;">+<span id="LC1318" class="line" lang="haskell"><span class="n" style="color: #333;">deferAfterPreciseException</span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lubDmdType</span> <span class="n" style="color: #333;">d</span> <span class="p">(</span><span class="n" style="color: #333;">emptyDmdType</span> <span class="n" style="color: #333;">conDiv</span><span class="p">)</span></span>
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1319
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<pre style="margin: 0;">+<span id="LC1319" class="line" lang="haskell"></span>
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1320
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<pre style="margin: 0;">+<span id="LC1320" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseException</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1321
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<pre style="margin: 0;">+<span id="LC1321" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseException</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1322
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<pre style="margin: 0;">+<span id="LC1322" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseException</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">ConOrDiv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1323" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1323
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<pre style="margin: 0;">+<span id="LC1323" class="line" lang="haskell"><span class="n" style="color: #333;">mayThrowPreciseException</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1324
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<pre style="margin: 0;">+<span id="LC1324" class="line" lang="haskell"></span>
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1307
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1325
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<pre style="margin: 0;"> <span id="LC1325" class="line" lang="haskell"><span class="n" style="color: #333;">strictenDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CleanDemand</span></span>
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1308
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1326
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<pre style="margin: 0;"> <span id="LC1326" class="line" lang="haskell"><span class="n" style="color: #333;">strictenDmd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">JD</span> <span class="p">{</span> <span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">s</span><span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u</span><span class="p">})</span></span>
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1309
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1327
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<pre style="margin: 0;"> <span id="LC1327" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">JD</span> <span class="p">{</span> <span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poke_s</span> <span class="n" style="color: #333;">s</span><span class="p">,</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poke_u</span> <span class="n" style="color: #333;">u</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1654" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1672" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1654,9 +1672,6 @@ type's depth! So in mkStrictSigForArity we make sure to trim the list of</td>
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1654
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1672
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<pre style="margin: 0;"> <span id="LC1672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">argument demands to the given threshold arity. Call sites will make sure that</span></span>
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1655
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1673
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<pre style="margin: 0;"> <span id="LC1673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this corresponds to the arity of the call demand that elicited the wrapped</span></span>
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1656
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1674
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<pre style="margin: 0;"> <span id="LC1674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">demand type. See also Note [What are demand signatures?] in DmdAnal.</span></span>
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1657
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<pre style="margin: 0;">-<span id="LC1657" class="line" lang="haskell"></span>
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1658
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<pre style="margin: 0;">-<span id="LC1658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Besides trimming argument demands, mkStrictSigForArity will also trim CPR</span></span>
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1659
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<pre style="margin: 0;">-<span id="LC1659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">information if necessary.</span></span>
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1660
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1675
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1661
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1676
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<pre style="margin: 0;"> <span id="LC1676" class="line" lang="haskell"></span>
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1662
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1677
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<pre style="margin: 0;"> <span id="LC1677" class="line" lang="haskell"><span class="cd">-- | The depth of the wrapped 'DmdType' encodes the arity at which it is safe</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1691" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1676,7 +1691,9 @@ pprIfaceStrictSig (StrictSig (DmdType _ dmds res))</td>
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1676
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1691
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<pre style="margin: 0;"> <span id="LC1691" class="line" lang="haskell"><span class="cd">-- | Turns a 'DmdType' computed for the particular 'Arity' into a 'StrictSig'</span></span>
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1677
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<pre style="margin: 0;"> <span id="LC1692" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unleashable at that arity. See Note [Understanding DmdType and StrictSig]</span></span>
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<pre style="margin: 0;"> <span id="LC1693" class="line" lang="haskell"><span class="n" style="color: #333;">mkStrictSigForArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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<pre style="margin: 0;">-<span id="LC1679" class="line" lang="haskell"><span class="n" style="color: #333;">mkStrictSigForArity</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="p">(</span><span class="n" style="color: #333;">ensureArgs</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">dmd_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1694" class="line" lang="haskell"><span class="n" style="color: #333;">mkStrictSigForArity</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">dmd_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fvs</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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1695
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<pre style="margin: 0;">+<span id="LC1695" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">dmdTypeDepth</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fvs</span> <span class="p">(</span><span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1696" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="p">(</span><span class="n" style="color: #333;">etaExpandDmdType</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">dmd_ty</span><span class="p">)</span></span>
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1697
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<pre style="margin: 0;"> <span id="LC1697" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1698" class="line" lang="haskell"><span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Demand</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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1699
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<pre style="margin: 0;"> <span id="LC1699" class="line" lang="haskell"><span class="n" style="color: #333;">mkClosedStrictSig</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkStrictSigForArity</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">emptyDmdEnv</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1684,26 +1701,33 @@ mkClosedStrictSig ds res = mkStrictSigForArity (length ds) (DmdType emptyDmdEnv</td>
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<pre style="margin: 0;"> <span id="LC1701" class="line" lang="haskell"><span class="n" style="color: #333;">splitStrictSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Demand</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1702" class="line" lang="haskell"><span class="n" style="color: #333;">splitStrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">dmds</span> <span class="n" style="color: #333;">res</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">dmds</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1703" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1687" class="line" lang="haskell"><span class="n" style="color: #333;">increaseStrictSigArity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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<pre style="margin: 0;">-<span id="LC1688" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Add extra arguments to a strictness signature.</span></span>
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<pre style="margin: 0;">-<span id="LC1689" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In contrast to 'etaExpandStrictSig', this /prepends/ additional argument</span></span>
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<pre style="margin: 0;">-<span id="LC1690" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- demands and leaves CPR info intact.</span></span>
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<pre style="margin: 0;">-<span id="LC1691" class="line" lang="haskell"><span class="n" style="color: #333;">increaseStrictSigArity</span> <span class="n" style="color: #333;">arity_increase</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">dmd_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmds</span> <span class="n" style="color: #333;">res</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC1704" class="line" lang="haskell"><span class="n" style="color: #333;">prependArgsStrictSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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<pre style="margin: 0;">+<span id="LC1705" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Add extra ('topDmd') arguments to a strictness signature.</span></span>
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<pre style="margin: 0;">+<span id="LC1706" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In contrast to 'etaConvertStrictSig', this /prepends/ additional argument</span></span>
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<pre style="margin: 0;">+<span id="LC1707" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- demands. This is used by FloatOut.</span></span>
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<pre style="margin: 0;">+<span id="LC1708" class="line" lang="haskell"><span class="n" style="color: #333;">prependArgsStrictSig</span> <span class="n" style="color: #333;">new_args</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">dmd_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmds</span> <span class="n" style="color: #333;">res</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC1709" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">new_args</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;"> <span id="LC1710" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTopDmdType</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">-<span id="LC1693" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arity_increase</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>
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1694
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<pre style="margin: 0;">-<span id="LC1694" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arity_increase</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WARN</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"increaseStrictSigArity:"</span></span>
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<pre style="margin: 0;">-<span id="LC1695" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"negative arity increase"</span></span>
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1696
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<pre style="margin: 0;">-<span id="LC1696" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arity_increase</span> <span class="p">)</span></span>
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1697
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<pre style="margin: 0;">-<span id="LC1697" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="p">(</span><span class="n" style="color: #333;">decreaseArityDmdType</span> <span class="n" style="color: #333;">dmd_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1711" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">new_args</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"prependArgsStrictSig: negative new_args"</span></span>
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<pre style="margin: 0;">+<span id="LC1712" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_args</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1713" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmds'</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1714" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1700" class="line" lang="haskell"> <span class="n" style="color: #333;">dmds'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">arity_increase</span> <span class="n" style="color: #333;">topDmd</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">dmds</span></span>
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1701
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<pre style="margin: 0;">-<span id="LC1701" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1702" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandStrictSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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<pre style="margin: 0;">-<span id="LC1703" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ We are expanding (\x y. e) to (\x y z. e z).</span></span>
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<pre style="margin: 0;">-<span id="LC1704" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In contrast to 'increaseStrictSigArity', this /appends/ extra arg demands if</span></span>
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<pre style="margin: 0;">-<span id="LC1705" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- necessary, potentially destroying the signature's CPR property.</span></span>
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<pre style="margin: 0;">-<span id="LC1706" class="line" lang="haskell"><span class="n" style="color: #333;">etaExpandStrictSig</span> <span class="n" style="color: #333;">arity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">dmd_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ensureArgs</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">dmd_ty</span></span>
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1715
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<pre style="margin: 0;">+<span id="LC1715" class="line" lang="haskell"> <span class="n" style="color: #333;">dmds'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">new_args</span> <span class="n" style="color: #333;">topDmd</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">dmds</span></span>
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1716
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<pre style="margin: 0;">+<span id="LC1716" class="line" lang="haskell"></span>
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1717
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<pre style="margin: 0;">+<span id="LC1717" class="line" lang="haskell"><span class="n" style="color: #333;">etaConvertStrictSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span></span>
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1718
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<pre style="margin: 0;">+<span id="LC1718" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ We are expanding (\x y. e) to (\x y z. e z) or reducing from the latter to</span></span>
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1719
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<pre style="margin: 0;">+<span id="LC1719" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the former (when the Simplifier identifies a new join points, for example).</span></span>
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1720
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<pre style="margin: 0;">+<span id="LC1720" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In contrast to 'prependArgsStrictSig', this /appends/ extra arg demands if</span></span>
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1721
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<pre style="margin: 0;">+<span id="LC1721" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- necessary.</span></span>
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1722
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<pre style="margin: 0;">+<span id="LC1722" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This works by looking at the 'DmdType' (which was produced under a call</span></span>
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1723
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<pre style="margin: 0;">+<span id="LC1723" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- demand for the old arity) and trying to transfer as many facts as we can to</span></span>
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1724
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<pre style="margin: 0;">+<span id="LC1724" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the call demand of new arity.</span></span>
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1725
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<pre style="margin: 0;">+<span id="LC1725" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- An arity increase (resulting in a stronger incoming demand) can retain much</span></span>
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1726
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<pre style="margin: 0;">+<span id="LC1726" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of the info, while an arity decrease (a weakening of the incoming demand)</span></span>
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1727
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<pre style="margin: 0;">+<span id="LC1727" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- must fall back to a conservative default.</span></span>
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1728
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<pre style="margin: 0;">+<span id="LC1728" class="line" lang="haskell"><span class="n" style="color: #333;">etaConvertStrictSig</span> <span class="n" style="color: #333;">arity</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">dmd_ty</span><span class="p">)</span></span>
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1729
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<pre style="margin: 0;">+<span id="LC1729" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">dmdTypeDepth</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">decreaseArityDmdType</span> <span class="n" style="color: #333;">dmd_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1730" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">etaExpandDmdType</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">dmd_ty</span></span>
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1731
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<pre style="margin: 0;"> <span id="LC1731" class="line" lang="haskell"></span>
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1708
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1732
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<pre style="margin: 0;"> <span id="LC1732" class="line" lang="haskell"><span class="n" style="color: #333;">isTopSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1709
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1733
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<pre style="margin: 0;"> <span id="LC1733" class="line" lang="haskell"><span class="n" style="color: #333;">isTopSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StrictSig</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTopDmdType</span> <span class="n" style="color: #333;">ty</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/0cd21aef3a23de4ec0ae21e7fc8f9904758c7554#2c842f2f15e67826dc12cc363525b56acb7b7882"><strong>compiler/basicTypes/Id.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -958,7 +958,7 @@ transferPolyIdInfo old_id abstract_wrt new_id</td>
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<pre style="margin: 0;"> <span id="LC958" class="line" lang="haskell"> <span class="n" style="color: #333;">new_occ_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zapOccTailCallInfo</span> <span class="n" style="color: #333;">old_occ_info</span></span>
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC960" class="line" lang="haskell"> <span class="n" style="color: #333;">old_strictness</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">strictnessInfo</span> <span class="n" style="color: #333;">old_info</span></span>
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<pre style="margin: 0;">-<span id="LC961" class="line" lang="haskell"> <span class="n" style="color: #333;">new_strictness</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">increaseStrictSigArity</span></span> <span class="n" style="color: #333;">arity_increase</span> <span class="n" style="color: #333;">old_strictness</span></span>
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="haskell"> <span class="n" style="color: #333;">new_strictness</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">prependArgsStrictSig</span></span> <span class="n" style="color: #333;">arity_increase</span> <span class="n" style="color: #333;">old_strictness</span></span>
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"> <span class="n" style="color: #333;">old_cpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cprInfo</span> <span class="n" style="color: #333;">old_info</span></span>
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC964" class="line" lang="haskell"> <span class="n" style="color: #333;">transfer</span> <span class="n" style="color: #333;">new_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_info</span> <span class="p">`</span><span class="n" style="color: #333;">setArityInfo</span><span class="p">`</span> <span class="n" style="color: #333;">new_arity</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/0cd21aef3a23de4ec0ae21e7fc8f9904758c7554#32cfa1d436eed1ea5106ea7f4f67090c60a01ed1"><strong>compiler/simplCore/SetLevels.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -87,7 +87,7 @@ import UniqSet ( nonDetFoldUniqSet )</td>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">UniqDSet</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">getUniqDSet</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">VarEnv</span></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Literal</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">litIsTrivial</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC90" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Demand</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isStrictDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitStrictSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">increaseStrictSigArity</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Demand</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">StrictSig</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isStrictDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitStrictSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">prependArgsStrictSig</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Cpr</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkCprSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botCpr</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Name</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">getOccName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkSystemVarName</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">OccName</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">occNameString</span> <span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -983,7 +983,7 @@ annotateBotStr id n_extra mb_str</td>
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983
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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_str</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC984" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC985" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">arity</span><span class="p">,</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">id</span> <span class="p">`</span><span class="n" style="color: #333;">setIdArity</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">n_extra</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC986" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdStrictness</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">increaseStrictSigArity</span></span> <span class="n" style="color: #333;">n_extra</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdStrictness</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">prependArgsStrictSig</span></span> <span class="n" style="color: #333;">n_extra</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC987" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdCprInfo</span><span class="p">`</span> <span class="n" style="color: #333;">mkCprSig</span> <span class="p">(</span><span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">n_extra</span><span class="p">)</span> <span class="n" style="color: #333;">botCpr</span></span>
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<pre style="margin: 0;"> <span id="LC988" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC989" class="line" lang="haskell"><span class="n" style="color: #333;">notWorthFloating</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/0cd21aef3a23de4ec0ae21e7fc8f9904758c7554#ea6c99f43a7d52025b4dfaf7a7822038a54a9a84"><strong>compiler/stranal/DmdAnal.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -220,12 +220,15 @@ dmdAnal' env dmd (Case scrut case_bndr ty [(DataAlt dc, bndrs, rhs)])</td>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">alt_ty1</span><span class="p">,</span> <span class="n" style="color: #333;">dmds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findBndrsDmds</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">alt_ty2</span><span class="p">,</span> <span class="n" style="color: #333;">case_bndr_dmd</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findBndrDmd</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">alt_ty1</span> <span class="n" style="color: #333;">case_bndr</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"> <span class="n" style="color: #333;">id_dmds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addCaseBndrDmd</span> <span class="n" style="color: #333;">case_bndr_dmd</span> <span class="n" style="color: #333;">dmds</span></span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Precise exceptions and strictness analysis] in Demand</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"> <span class="n" style="color: #333;">alt_ty3</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">mayThrowPreciseException</span> <span class="n" style="color: #333;">scrut_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">deferAfterPreciseException</span> <span class="n" style="color: #333;">alt_ty2</span></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alt_ty2</span></span>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Compute demand on the scrutinee</span></span>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Demand on scrutinee of a product case]</span></span>
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<pre style="margin: 0;"> <span id="LC229" class="line" lang="haskell"> <span class="n" style="color: #333;">scrut_dmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkProdDmd</span> <span class="n" style="color: #333;">id_dmds</span></span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">scrut_ty</span><span class="p">,</span> <span class="n" style="color: #333;">scrut'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdAnal</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">scrut_dmd</span> <span class="n" style="color: #333;">scrut</span></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alt_ty<span class="idiff left right">2</span></span> <span class="p">`</span><span class="n" style="color: #333;">bothDmdType</span><span class="p">`</span> <span class="n" style="color: #333;">toBothDmdArg</span> <span class="n" style="color: #333;">scrut_ty</span></span>
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alt_ty<span class="idiff left right">3</span></span> <span class="p">`</span><span class="n" style="color: #333;">bothDmdType</span><span class="p">`</span> <span class="n" style="color: #333;">toBothDmdArg</span> <span class="n" style="color: #333;">scrut_ty</span></span>
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232
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"> <span class="n" style="color: #333;">case_bndr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIdDemandInfo</span> <span class="n" style="color: #333;">case_bndr</span> <span class="n" style="color: #333;">case_bndr_dmd</span></span>
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230
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233
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setBndrsDemandInfo</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">id_dmds</span></span>
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231
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234
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="543" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -540,8 +543,6 @@ dmdAnalRhsLetDown rec_flag env let_dmd id rhs</td>
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540
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543
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkRhsDmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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541
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544
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">rhs_fv</span> <span class="n" style="color: #333;">rhs_dmds</span> <span class="n" style="color: #333;">rhs_div</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span></span>
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542
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545
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdAnal</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs_dmd</span> <span class="n" style="color: #333;">rhs</span></span>
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543
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Won't the following line unnecessarily trim down arity for join</span></span>
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544
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<pre style="margin: 0;">-<span id="LC544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- points returning a lambda in a C(S) context?</span></span>
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545
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546
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="haskell"> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkStrictSigForArity</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="p">(</span><span class="n" style="color: #333;">mkDmdType</span> <span class="n" style="color: #333;">sig_fv</span> <span class="n" style="color: #333;">rhs_dmds</span> <span class="n" style="color: #333;">rhs_div</span><span class="p">)</span></span>
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546
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547
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell"> <span class="n" style="color: #333;">id'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">set_idStrictness</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">sig</span></span>
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547
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548
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [NOINLINE and strictness]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/0cd21aef3a23de4ec0ae21e7fc8f9904758c7554#fefba0bb63e2af077c91206052f9c20caa85d3c7"><strong>compiler/stranal/WwLib.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1189,7 +1189,10 @@ mk_absent_let dflags fam_envs arg</td>
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1189
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1189
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="haskell"></span>
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1190
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="haskell"> <span class="n" style="color: #333;">abs_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkAbsentErrorApp</span> <span class="n" style="color: #333;">arg_ty</span> <span class="n" style="color: #333;">msg</span></span>
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1191
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1191
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<pre style="margin: 0;"> <span id="LC1191" class="line" lang="haskell"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">showSDoc</span> <span class="p">(</span><span class="n" style="color: #333;">gopt_set</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_SuppressUniques</span><span class="p">)</span></span>
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1192
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<pre style="margin: 0;">-<span id="LC1192" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">arg</span><span class="p">))</span></span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">file_msg</span><span class="p">)</span></span>
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1193
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<pre style="margin: 0;">+<span id="LC1193" class="line" lang="haskell"> <span class="n" style="color: #333;">file_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">outputFile</span> <span class="n" style="color: #333;">dflags</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1194
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<pre style="margin: 0;">+<span id="LC1194" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">empty</span></span>
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1195
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<pre style="margin: 0;">+<span id="LC1195" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in output file "</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">f</span><span class="p">)</span></span>
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1193
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1196
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<pre style="margin: 0;"> <span id="LC1196" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need to suppress uniques here because otherwise they'd</span></span>
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1194
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1197
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<pre style="margin: 0;"> <span id="LC1197" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- end up in the generated code as strings. This is bad for</span></span>
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1195
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1198
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<pre style="margin: 0;"> <span id="LC1198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- determinism, because with different uniques the strings</span></span>
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