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<h3>

Sebastian Graf pushed to branch wip/refactor-demand

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aabd8a4cb01328e8b885c9a3608a229a69c295ff">aabd8a4c</a></strong>

<div>

<span>by Sebastian Graf</span>

<i>at 2020-11-16T21:16:02+01:00</i>

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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix regression

</pre>

</li>

</ul>

<h4>3 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#8104fa1b71db6cfc4eb90cd769463d9eb9004619">

compiler/GHC/Core/Opt/DmdAnal.hs

</a>

</li>

<li class="file-stats">

<a href="#b6a5ba32bafb8fbda933538b3007e755fef6f101">

compiler/GHC/Core/Opt/SpecConstr.hs

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<li class="file-stats">

<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">

compiler/GHC/Types/Demand.hs

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="8104fa1b71db6cfc4eb90cd769463d9eb9004619">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aabd8a4cb01328e8b885c9a3608a229a69c295ff#8104fa1b71db6cfc4eb90cd769463d9eb9004619"><strong>compiler/GHC/Core/Opt/DmdAnal.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="78" 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="78" 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">@@ -78,12 +78,12 @@ dmdAnalTopBind env (NonRec id rhs)</td>

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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span> <span class="n" style="color: #333;">extendAnalEnv</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevel</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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<td class="diff-line-num old_line" data-linenumber="79" 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">

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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell">    <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="p">(</span><span class="n" style="color: #333;">setIdStrictness</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">-<span id="LC81" class="line" lang="haskell">    <span class="p">(</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">sig</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdAnalRhsLetDown</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left right">cleanEval</span>Dmd</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs</span></span>

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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell">    <span class="p">(</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">sig</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdAnalRhsLetDown</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left right">topSub</span>Dmd</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs</span></span>

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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnalTopBind</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="n" style="color: #333;">pairs</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell">  <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;">Rec</span> <span class="n" style="color: #333;">pairs'</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">-<span id="LC86" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">pairs'</span><span class="p">)</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdFix</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevel</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left right">cleanEval</span>Dmd</span> <span class="n" style="color: #333;">pairs</span></span>

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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">pairs'</span><span class="p">)</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdFix</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevel</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left right">topSub</span>Dmd</span> <span class="n" style="color: #333;">pairs</span></span>

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<pre style="margin: 0;"> <span id="LC87" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- We get two iterations automatically</span></span>

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<pre style="margin: 0;"> <span id="LC88" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- c.f. the NonRec case above</span></span>

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<pre style="margin: 0;"> <span id="LC89" 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">@@ -263,7 +263,7 @@ dmdAnal' env dmd (Case scrut case_bndr ty [(DataAlt dc, bndrs, rhs)])</td>

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<pre style="margin: 0;"> <span id="LC263" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnal'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Case</span> <span class="n" style="color: #333;">scrut</span> <span class="n" style="color: #333;">case_bndr</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC264" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span>      <span class="c1" style="color: #998; font-style: italic;">-- Case expression with multiple alternatives</span></span>

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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell">        <span class="p">(</span><span class="n" style="color: #333;">alt_tys</span><span class="p">,</span> <span class="n" style="color: #333;">alts'</span><span class="p">)</span>     <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAndUnzip</span> <span class="p">(</span><span class="n" style="color: #333;">dmdAnalAlt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">dmd</span> <span class="n" style="color: #333;">case_bndr</span><span class="p">)</span> <span class="n" style="color: #333;">alts</span></span>

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<pre style="margin: 0;">-<span id="LC266" 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;"><span class="idiff left right">cleanEval</span>Dmd</span> <span class="n" style="color: #333;">scrut</span></span>

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<pre style="margin: 0;">+<span id="LC266" 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;"><span class="idiff left right">topSub</span>Dmd</span> <span class="n" style="color: #333;">scrut</span></span>

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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell">        <span class="p">(</span><span class="n" style="color: #333;">alt_ty</span><span class="p">,</span> <span class="n" style="color: #333;">case_bndr'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">annotateBndr</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">lubDmdType</span> <span class="n" style="color: #333;">botDmdType</span> <span class="n" style="color: #333;">alt_tys</span><span class="p">)</span> <span class="n" style="color: #333;">case_bndr</span></span>

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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell">                               <span class="c1" style="color: #998; font-style: italic;">-- NB: Base case is botDmdType, for empty case alternatives</span></span>

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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell">                               <span class="c1" style="color: #998; font-style: italic;">--     This is a unit for lubDmdType, and the right result</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="668" 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>

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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">@@ -668,7 +668,7 @@ dmdAnalRhsLetDown rec_flag env let_dmd id rhs</td>

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<pre style="margin: 0;"> <span id="LC668" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a call demand of @rhs_arity@</span></span>

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<pre style="margin: 0;"> <span id="LC669" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Historical Note [Product demands for function body]</span></span>

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<pre style="margin: 0;"> <span id="LC670" class="line" lang="haskell"><span class="n" style="color: #333;">mkRhsDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</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;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SubDemand</span></span>

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<pre style="margin: 0;">-<span id="LC671" class="line" lang="haskell"><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 class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCallDmds</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;"><span class="idiff left right">cleanEval</span>Dmd</span></span>

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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell"><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 class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCallDmds</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;"><span class="idiff left right">topSub</span>Dmd</span></span>

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<pre style="margin: 0;"> <span id="LC672" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"><span class="cd">-- | If given the (local, non-recursive) let-bound 'Id', 'useLetUp' determines</span></span>

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<pre style="margin: 0;"> <span id="LC674" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- whether we should process the binding up (body before rhs) or down (rhs</span></span>

</pre>

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<li id="b6a5ba32bafb8fbda933538b3007e755fef6f101">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aabd8a4cb01328e8b885c9a3608a229a69c295ff#b6a5ba32bafb8fbda933538b3007e755fef6f101"><strong>compiler/GHC/Core/Opt/SpecConstr.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1724" 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="1724" 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">@@ -1724,7 +1724,7 @@ calcSpecStrictness fn qvars pats</td>

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<pre style="margin: 0;"> <span id="LC1724" class="line" lang="haskell">    <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">env</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="n" style="color: #333;">env</span></span>

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<pre style="margin: 0;"> <span id="LC1725" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC1726" class="line" lang="haskell">    <span class="n" style="color: #333;">go_one</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;">Demand</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="kt" style="color: #458; font-weight: 600;">DmdEnv</span></span>

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<pre style="margin: 0;">-<span id="LC1727" class="line" lang="haskell">    <span class="n" style="color: #333;">go_one</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">d</span>          <span class="idiff left right">     </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarEnv_C</span> <span class="n" style="color: #333;">plusDmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">v</span> <span class="n" style="color: #333;">d</span></span>

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<pre style="margin: 0;">+<span id="LC1727" class="line" lang="haskell">    <span class="n" style="color: #333;">go_one</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">d</span>          <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarEnv_C</span> <span class="n" style="color: #333;">plusDmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">v</span> <span class="n" style="color: #333;">d</span></span>

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<pre style="margin: 0;"> <span id="LC1728" class="line" lang="haskell">    <span class="n" style="color: #333;">go_one</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">_n</span> <span class="o" style="font-weight: 600;">:*</span> <span class="n" style="color: #333;">cd</span><span class="p">)</span> <span class="n" style="color: #333;">e</span> <span class="c1" style="color: #998; font-style: italic;">-- NB: _n does not have to be strict</span></span>

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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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">collectArgs</span> <span class="n" style="color: #333;">e</span></span>

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<pre style="margin: 0;"> <span id="LC1730" class="line" lang="haskell">      <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">viewProd</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="n" style="color: #333;">cd</span></span>

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<li id="d09e98aae6ad2eb59d08eac7894b68c0ab820cda">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aabd8a4cb01328e8b885c9a3608a229a69c295ff#d09e98aae6ad2eb59d08eac7894b68c0ab820cda"><strong>compiler/GHC/Types/Demand.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="17" 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="17" 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">@@ -17,7 +17,7 @@ module GHC.Types.Demand (</td>

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- * Demands</span></span>

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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell">    <span class="kt" style="color: #458; font-weight: 600;">Card</span><span class="p">(</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="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">SubDemand</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Prod</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">mkProd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">viewProd</span><span class="p">,</span></span>

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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- ** Algebra</span></span>

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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell">    <span class="nf" style="color: #900; font-weight: 600;">absDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">topDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">seqDmd</span><span class="p">,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell">    <span class="nf" style="color: #900; font-weight: 600;">absDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">topDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">seqDmd</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">topSubDmd</span></span><span class="p"><span class="idiff right">,</span></span></span>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- *** Least upper bound</span></span>

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<td class="diff-line-num old_line" data-linenumber="22" 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">

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell">    <span class="nf" style="color: #900; font-weight: 600;">lubCard</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lubDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lubSubDmd</span><span class="p">,</span></span>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- *** Plus</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="29" 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="29" 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">@@ -29,7 +29,7 @@ module GHC.Types.Demand (</td>

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<td class="diff-line-num old_line" data-linenumber="29" 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">

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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell">    <span class="nf" style="color: #900; font-weight: 600;">isAbsDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUsedOnceDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isStrUsedDmd</span><span class="p">,</span></span>

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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell">    <span class="nf" style="color: #900; font-weight: 600;">isTopDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isSeqDmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isWeakDmd</span><span class="p">,</span></span>

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- ** Special demands</span></span>

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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell">    <span class="nf" style="color: #900; font-weight: 600;">evalDmd</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">cleanEvalDmd</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">cleanEvalProdDmd</span></span><span class="p"><span class="idiff right">,</span></span></span>

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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell">    <span class="nf" style="color: #900; font-weight: 600;">evalDmd</span><span class="p">,</span></span>

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- *** Demands used in PrimOp signatures</span></span>

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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell">    <span class="nf" style="color: #900; font-weight: 600;">lazyApply1Dmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lazyApply2Dmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">strictOnceApply1Dmd</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">strictManyApply1Dmd</span><span class="p">,</span></span>

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<td class="diff-line-num old_line" data-linenumber="35" 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">

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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- ** Other @Demand@ operations</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="311" 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="311" 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">@@ -311,7 +311,7 @@ polyDmd C_10 = C_10 :* poly10</td>

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<pre style="margin: 0;"> <span id="LC311" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'SubDemand's when possible. Note that this degrades boxity information! E.g. a</span></span>

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<pre style="margin: 0;"> <span id="LC312" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- polymorphic demand will never unbox.</span></span>

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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"><span class="n" style="color: #333;">mkProd</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;">SubDemand</span></span>

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<pre style="margin: 0;">-<span id="LC314" class="line" lang="haskell"><span class="n" style="color: #333;">mkProd</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">bot</span>SubDmd</span></span>

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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"><span class="n" style="color: #333;">mkProd</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">seq</span>SubDmd</span></span>

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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"><span class="n" style="color: #333;">mkProd</span> <span class="n" style="color: #333;">ds</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">:*</span><span class="n" style="color: #333;">sd</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC316" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">want_to_simplify</span> <span class="n" style="color: #333;">n</span><span class="p">,</span> <span class="n" style="color: #333;">all</span> <span class="p">(</span><span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">polyDmd</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="n" style="color: #333;">ds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sd</span></span>

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<pre style="margin: 0;"> <span id="LC317" 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;">Prod</span> <span class="n" style="color: #333;">ds</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">@@ -456,13 +456,7 @@ isWeakDmd dmd@(n :* _) = not (isStrict n) && is_plus_idem_dmd dmd</td>

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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell">    <span class="n" style="color: #333;">is_plus_idem_sub_dmd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Call</span> <span class="n" style="color: #333;">n</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;">is_plus_idem_card</span> <span class="n" style="color: #333;">n</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Call demands are relative]</span></span>

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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"><span class="n" style="color: #333;">evalDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span></span>

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<pre style="margin: 0;">-<span id="LC459" class="line" lang="haskell"><span class="n" style="color: #333;">evalDmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">C_1N</span> <span class="o" style="font-weight: 600;">:*</span> <span class="n" style="color: #333;">cleanEvalDmd</span></span>

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<pre style="margin: 0;">-<span id="LC460" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC461" class="line" lang="haskell"><span class="n" style="color: #333;">cleanEvalDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SubDemand</span></span>

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<pre style="margin: 0;">-<span id="LC462" class="line" lang="haskell"><span class="n" style="color: #333;">cleanEvalDmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">topSubDmd</span></span>

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<pre style="margin: 0;">-<span id="LC463" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC464" class="line" lang="haskell"><span class="n" style="color: #333;">cleanEvalProdDmd</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;">SubDemand</span></span>

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<pre style="margin: 0;">-<span id="LC465" class="line" lang="haskell"><span class="n" style="color: #333;">cleanEvalProdDmd</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Prod</span> <span class="p">(</span><span class="n" style="color: #333;">replicate</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">topDmd</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"><span class="n" style="color: #333;">evalDmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">C_1N</span> <span class="o" style="font-weight: 600;">:*</span> <span class="n" style="color: #333;">topSubDmd</span></span>

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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"><span class="cd">-- | First argument of 'GHC.Exts.maskAsyncExceptions#': @SCS(U)@.</span></span>

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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Called exactly once.</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="558" 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="552" 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">@@ -558,7 +552,9 @@ addCaseBndrDmd (n :* sd) alt_dmds</td>

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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isAbs</span> <span class="n" style="color: #333;">n</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alt_dmds</span></span>

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559

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<pre style="margin: 0;"> <span id="LC553" 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;">zipWith</span> <span class="n" style="color: #333;">plusDmd</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">alt_dmds</span> <span class="c1" style="color: #998; font-style: italic;">-- fuse ds!</span></span>

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<pre style="margin: 0;"> <span id="LC554" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

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<td class="diff-line-num new_line old" data-linenumber="555" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC561" class="line" lang="haskell">    <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">viewProd</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">alt_dmds</span><span class="p">)</span> <span class="n" style="color: #333;">sd</span> <span class="c1" style="color: #998; font-style: italic;">-- Guaranteed not to be a call</span></span>

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<pre style="margin: 0;">+<span id="LC555" class="line" lang="haskell">    <span class="n" style="color: #333;">sd'</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStrict</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sd</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC556" 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;">multSubDmd</span> <span class="kt" style="color: #458; font-weight: 600;">C_01</span> <span class="n" style="color: #333;">sd</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC557" class="line" lang="haskell">    <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">viewProd</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">alt_dmds</span><span class="p">)</span> <span class="n" style="color: #333;">sd'</span> <span class="c1" style="color: #998; font-style: italic;">-- Guaranteed not to be a call</span></span>

</pre>

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562

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558

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<pre style="margin: 0;"> <span id="LC558" class="line" lang="haskell"></span>

</pre>

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563

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<td class="diff-line-num new_line" data-linenumber="559" 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">

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<pre style="margin: 0;"> <span id="LC559" class="line" lang="haskell"><span class="n" style="color: #333;">argsOneShots</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;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]]</span></span>

</pre>

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564

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<td class="diff-line-num new_line" data-linenumber="560" 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">

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<pre style="margin: 0;"> <span id="LC560" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ See Note [Computing one-shot info]</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="578" 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="574" 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">@@ -578,7 +574,7 @@ argsOneShots (StrictSig (DmdType _ arg_ds _)) n_val_args</td>

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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"><span class="n" style="color: #333;">argOneShots</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span>          <span class="c1" style="color: #998; font-style: italic;">-- ^ depending on saturation</span></span>

</pre>

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579

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<td class="diff-line-num new_line" data-linenumber="575" 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">

575

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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell">            <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OneShotInfo</span><span class="p">]</span></span>

</pre>

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580

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<td class="diff-line-num new_line" data-linenumber="576" 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">

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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ See Note [Computing one-shot info]</span></span>

</pre>

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581

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<pre style="margin: 0;">-<span id="LC581" class="line" lang="haskell"><span class="n" style="color: #333;">argOneShots</span> <span class="p">(</span><span class="kr" style="font-weight: 600;"><span class="idiff left">_</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">sd</span></span><span class="p"><span class="idiff">)</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">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">sd</span></span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="577" 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">

577

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<pre style="margin: 0;">+<span id="LC577" class="line" lang="haskell"><span class="n" style="color: #333;">argOneShots</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">n</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">sd</span></span><span class="p"><span class="idiff">)</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">go</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">multSubDmd</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sd</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Call demands are relative]</span></span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="582" 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">

582

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<td class="diff-line-num new_line" data-linenumber="578" 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">

578

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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="583" 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">

583

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<td class="diff-line-num new_line" data-linenumber="579" 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">

579

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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell">    <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Call</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">sd</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="584" 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">

584

</td>

<td class="diff-line-num new_line" data-linenumber="580" 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">

580

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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isUsedOnce</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OneShotLam</span>    <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">sd</span></span>

</pre>

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