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<h3>
Sebastian Graf pushed to branch wip/nested-cpr-2019
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3dde931c9c60af736557fb90817fe177ab43e2d5">3dde931c</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-05-18T16:36:42+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring around cprAnalBind
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ae7eb1f530eba8e30fb85a0f5d018e15666b882">3ae7eb1f</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-05-18T17:08:43+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix case binder CPR by not looking into unfoldings of case binders
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<h4>2 changed files:</h4>
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<a href="#c1bf6b849619bc8d7ef37a97d993dbfaa9966f7b">
compiler/GHC/Core/Opt/CprAnal.hs
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<a href="#5a3376ebe9ef8294e13f1fb3761637fa76cd1558">
compiler/GHC/Types/Cpr.hs
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<h4>Changes:</h4>
<li id="c1bf6b849619bc8d7ef37a97d993dbfaa9966f7b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/0c2eedad466fabeb8367a3d7617f13e87df9778f...3ae7eb1f530eba8e30fb85a0f5d018e15666b882#c1bf6b849619bc8d7ef37a97d993dbfaa9966f7b"><strong>compiler/GHC/Core/Opt/CprAnal.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">@@ -119,9 +119,9 @@ cprAnalTopBind :: AnalEnv</td>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreBind</span></span>
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<pre style="margin: 0;"> <span id="LC120" 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;">AnalEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">)</span></span>
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121
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="haskell"><span class="n" style="color: #333;">cprAnalTopBind</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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122
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">e<span class="idiff left">xtendAnalEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id'</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idCprInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id'</span></span><span class="p"><span class="idiff right">)</span>,</span> <span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">id'</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">e<span class="idiff left right">nv'</span></span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">id'</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span></span>
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123
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">id'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p"><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">cprAnalBind</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TopLevel</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">env</span></span> <span class="kt" style="color: #458; font-weight: 600;">[]</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="LC124" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">id'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env'</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">cprAnalBind</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TopLevel</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">noWidening</span></span> <span class="kt" style="color: #458; font-weight: 600;">[]</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="LC125" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"><span class="n" style="color: #333;">cprAnalTopBind</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="LC127" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -196,7 +196,7 @@ cprAnal' env args (Lam var body)</td>
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">body_args</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">args'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">args'</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- We know things about the argument, for example from a StrictSig or an incoming argument. NB: This can never be an anonymous (non-let-bound) lambda! The simplifier would have eliminated the necessary (App (Lam{} |> co) _) construct.</span></span>
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<pre style="margin: 0;"> <span id="LC198" 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="p">(</span><span class="n" style="color: #333;">topCprType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- An anonymous lambda or no info on its argument</span></span>
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extend<span class="idiff left right">Anal</span>Env</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- TODO: I think we also need to store assumed argument strictness (which would be all lazy here) in the env</span></span>
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extend<span class="idiff left right">Sig</span>Env</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- TODO: I think we also need to store assumed argument strictness (which would be all lazy here) in the env</span></span>
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">body_ty</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cprAnal</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">body_args</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"> <span class="n" style="color: #333;">lam_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">abstractCprTy</span> <span class="n" style="color: #333;">body_ty</span></span>
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<pre style="margin: 0;"> <span id="LC202" 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">@@ -213,9 +213,8 @@ cprAnal' env args (Case scrut case_bndr ty alts)</td>
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213
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"><span class="n" style="color: #333;">cprAnal'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">args</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">body_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">id'</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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216
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">id'</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;">cprAnalBind</span> <span class="kt" style="color: #458; font-weight: 600;">NotTopLevel</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">args</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="LC217" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendAnalEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id'</span> <span class="p">(</span><span class="n" style="color: #333;">idCprInfo</span> <span class="n" style="color: #333;">id'</span><span class="p">)</span></span>
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218
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">body_ty</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cprAnal</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">id'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">env'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cprAnalBind</span> <span class="kt" style="color: #458; font-weight: 600;">NotTopLevel</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">noWidening</span> <span class="n" style="color: #333;">args</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="LC217" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">body_ty</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cprAnal</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"><span class="n" style="color: #333;">cprAnal'</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">args</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Let</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 class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">body_ty</span> <span class="p">`</span><span class="n" style="color: #333;">seq</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">body_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Let</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 class="n" style="color: #333;">body'</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">@@ -239,7 +238,7 @@ cprAnalAlt env args case_bndr case_bndr_ty (con@(DataAlt dc),bndrs,rhs)</td>
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239
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="haskell"><span class="n" style="color: #333;">cprAnalAlt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">case_bndr</span> <span class="n" style="color: #333;">case_bndr_ty</span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="p">,</span><span class="n" style="color: #333;">bndrs</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="LC239" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_ty</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs</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="LC240" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extend<span class="idiff left right">Anal</span>Env</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">case_bndr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">case_bndr_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extend<span class="idiff left right">Sig</span>Env</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">case_bndr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">case_bndr_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rhs_ty</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;">cprAnal</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell"><span class="c1" 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">@@ -256,6 +255,9 @@ cprTransform env args id</td>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Local let-bound</span></span>
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<pre style="margin: 0;">+<span id="LC259" 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="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupSigEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cprTransformSig</span> <span class="p">(</span><span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">sig</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR for expandable unfoldings]</span></span>
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<pre style="margin: 0;"> <span id="LC262" 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="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cprExpandUnfolding_maybe</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC263" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cprAnal</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">rhs</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">@@ -265,9 +267,6 @@ cprTransform env args id</td>
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Imported function or data con worker</span></span>
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGlobalId</span> <span class="n" style="color: #333;">id</span></span>
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267
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cprTransformSig</span> <span class="p">(</span><span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">idCprInfo</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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268
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<pre style="margin: 0;">-<span id="LC268" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Local let-bound</span></span>
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269
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<pre style="margin: 0;">-<span id="LC269" 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="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupSigEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">-<span id="LC270" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cprTransformSig</span> <span class="p">(</span><span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">sig</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC270" 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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<pre style="margin: 0;"> <span id="LC271" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">topCprType</span></span>
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<pre style="margin: 0;"> <span id="LC272" 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">@@ -275,57 +274,27 @@ cprTransform env args id</td>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Bindings</span></span>
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC278" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Recursive bindings</span></span>
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<pre style="margin: 0;">-<span id="LC279" class="line" lang="haskell"><span class="n" style="color: #333;">cprFix</span></span>
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<pre style="margin: 0;">-<span id="LC280" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span></span>
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<pre style="margin: 0;">-<span id="LC281" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="c1" style="color: #998; font-style: italic;">-- Does not include bindings for this binding</span></span>
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<pre style="margin: 0;">-<span id="LC282" 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;">CprType</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC283" 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;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)]</span></span>
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<pre style="margin: 0;">-<span id="LC284" 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;">AnalEnv</span><span class="p">,</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)])</span> <span class="c1" style="color: #998; font-style: italic;">-- Binders annotated with stricness info</span></span>
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<pre style="margin: 0;">-<span id="LC285" class="line" lang="haskell"><span class="n" style="color: #333;">cprFix</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">str</span> <span class="n" style="color: #333;">orig_pairs</span></span>
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<pre style="margin: 0;">-<span id="LC286" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loop</span> <span class="mi" style="color: #099;">1</span> <span class="n" style="color: #333;">initial_pairs</span></span>
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<pre style="margin: 0;">-<span id="LC287" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC288" class="line" lang="haskell"> <span class="n" style="color: #333;">init_sig</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCprSig</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">divergeCpr</span></span>
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<pre style="margin: 0;">-<span id="LC289" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Initialising strictness] in GHC.Core.Opt.DmdAnal</span></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"> <span class="n" style="color: #333;">initial_pairs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ae_virgin</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;">setIdCprInfo</span> <span class="n" style="color: #333;">id</span> <span class="p">(</span><span class="n" style="color: #333;">init_sig</span> <span class="n" style="color: #333;">id</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="p">(</span><span class="n" style="color: #333;">id</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;">orig_pairs</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC291" 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;">orig_pairs</span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The fixed-point varies the idCprInfo field of the binders, and terminates if that</span></span>
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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- annotation does not change any more.</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"> <span class="n" style="color: #333;">loop</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="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</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;">AnalEnv</span><span class="p">,</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)])</span></span>
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"> <span class="n" style="color: #333;">loop</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">-<span id="LC297" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">found_fixpoint</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">final_anal_env</span><span class="p">,</span> <span class="n" style="color: #333;">pairs'</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC298" 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="c1" style="color: #998; font-style: italic;">-- pprTrace "cprFix:loop" (ppr n <+> ppr (map fst pairs)) $</span></span>
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<pre style="margin: 0;">-<span id="LC299" class="line" lang="haskell"> <span class="n" style="color: #333;">loop</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">pairs'</span></span>
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<pre style="margin: 0;">-<span id="LC300" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC301" class="line" lang="haskell"> <span class="n" style="color: #333;">found_fixpoint</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">selector</span> <span class="n" style="color: #333;">pairs'</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">selector</span> <span class="n" style="color: #333;">pairs</span></span>
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302
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<pre style="margin: 0;">-<span id="LC302" class="line" lang="haskell"> <span class="n" style="color: #333;">selector</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">idCprInfo</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fst</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="haskell"> <span class="n" style="color: #333;">first_round</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="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="haskell"> <span class="n" style="color: #333;">pairs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">step</span> <span class="n" style="color: #333;">first_round</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">-<span id="LC305" class="line" lang="haskell"> <span class="n" style="color: #333;">final_anal_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendAnalEnvs</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">pairs'</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC306" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC307" class="line" lang="haskell"> <span class="n" style="color: #333;">step</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</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;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)]</span></span>
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<pre style="margin: 0;">-<span id="LC308" class="line" lang="haskell"> <span class="n" style="color: #333;">step</span> <span class="n" style="color: #333;">first_round</span> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pairs'</span></span>
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<pre style="margin: 0;">-<span id="LC309" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC310" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In all but the first iteration, delete the virgin flag</span></span>
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<pre style="margin: 0;">-<span id="LC311" class="line" lang="haskell"> <span class="n" style="color: #333;">start_env</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">first_round</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="LC312" 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;">nonVirgin</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Widening</span></span>
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC314" class="line" lang="haskell"><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">start</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">extendAnalEnvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">start_env</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fst</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pairs</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"><span class="kr" style="font-weight: 600;"><span class="idiff left">type</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Widening</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CprSig</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">CprSig</span></span></span>
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC316" 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;">pairs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAccumL</span> <span class="n" style="color: #333;">my_downRhs</span> <span class="n" style="color: #333;">start</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"><span class="n" style="color: #333;">noWidening</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Widening</span></span>
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<pre style="margin: 0;">+<span id="LC284" class="line" lang="haskell"><span class="n" style="color: #333;">noWidening</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="LC285" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"> <span class="n" style="color: #333;">my_downRhs</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">id</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="LC319" 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="p">(</span><span class="n" style="color: #333;">id2</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="LC320" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">id1</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;">cprAnalBind</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">str</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="LC322" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Ensuring termination of fixed-point iteration]</span></span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"> <span class="n" style="color: #333;">id2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIdCprInfo</span> <span class="n" style="color: #333;">id1</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">pruneSig</span> <span class="n" style="color: #333;">mAX_DEPTH</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">markDiverging</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">idCprInfo</span> <span class="n" style="color: #333;">id1</span></span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendAnalEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id2</span> <span class="p">(</span><span class="n" style="color: #333;">idCprInfo</span> <span class="n" style="color: #333;">id2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="haskell"><span class="cd">-- | A widening operator on 'CprSig' to ensure termination of fixed-point</span></span>
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- iteration. See Note [Ensuring termination of fixed-point iteration]</span></span>
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<pre style="margin: 0;">+<span id="LC288" class="line" lang="haskell"><span class="n" style="color: #333;">depthWidening</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Widening</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"><span class="n" style="color: #333;">depthWidening</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pruneSig</span> <span class="n" style="color: #333;">mAX_DEPTH</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">markDiverging</span></span>
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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"><span class="n" style="color: #333;">mAX_DEPTH</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"><span class="n" style="color: #333;">mAX_DEPTH</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">4</span></span>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"><span class="n" style="color: #333;">pruneSig</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;">CprSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span></span>
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"><span class="n" style="color: #333;">pruneSig</span> <span class="n" style="color: #333;">d</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">cpr_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cpr_ty</span> <span class="p">{</span> <span class="n" style="color: #333;">ct_cpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pruneDeepCpr</span> <span class="n" style="color: #333;">d</span> <span class="p">(</span><span class="n" style="color: #333;">ct_cpr</span> <span class="n" style="color: #333;">cpr_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO: We need the lubCpr with the initial CPR because</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of functions like iterate, which we would CPR</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- multiple levels deep, thereby changing termination</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">@@ -333,35 +302,26 @@ mAX_DEPTH = 4</td>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"><span class="n" style="color: #333;">markDiverging</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span></span>
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="haskell"><span class="n" style="color: #333;">markDiverging</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">cpr_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cpr_ty</span> <span class="p">{</span> <span class="n" style="color: #333;">ct_cpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_cpr</span> <span class="n" style="color: #333;">cpr_ty</span> <span class="p">`</span><span class="n" style="color: #333;">lubCpr</span><span class="p">`</span> <span class="n" style="color: #333;">divergeCpr</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC336" class="line" lang="haskell"><span class="cd">-- | A widening operator on 'CprSig' to ensure termination of fixed-point</span></span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- iteration. See Note [Ensuring termination of fixed-point iteration]</span></span>
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<pre style="margin: 0;">-<span id="LC338" class="line" lang="haskell"><span class="n" style="color: #333;">pruneSig</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;">CprSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span></span>
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<pre style="margin: 0;">-<span id="LC339" class="line" lang="haskell"><span class="n" style="color: #333;">pruneSig</span> <span class="n" style="color: #333;">d</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">cpr_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC340" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cpr_ty</span> <span class="p">{</span> <span class="n" style="color: #333;">ct_cpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pruneDeepCpr</span> <span class="n" style="color: #333;">d</span> <span class="p">(</span><span class="n" style="color: #333;">ct_cpr</span> <span class="n" style="color: #333;">cpr_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"><span class="n" style="color: #333;">unboxingStrategy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UnboxingStrategy</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"><span class="n" style="color: #333;">unboxingStrategy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">dmd</span></span>
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<pre style="margin: 0;">-<span id="LC344" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prj</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">wantToUnbox</span> <span class="p">(</span><span class="n" style="color: #333;">ae_fam_envs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">has_inlineable_prag</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">dmd</span></span>
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<pre style="margin: 0;">-<span id="LC345" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC346" class="line" lang="haskell"> <span class="n" style="color: #333;">prj</span> <span class="p">(</span><span class="n" style="color: #333;">dmds</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DataConAppContext</span> <span class="p">{</span> <span class="n" style="color: #333;">dcac_dc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">dcac_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tys_w_str</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">tys_w_str</span><span class="p">,</span> <span class="n" style="color: #333;">dmds</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Rather than maintaining in AnalEnv whether we are in an INLINEABLE</span></span>
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- function, we just assume that we aren't. That flag is only relevant</span></span>
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<pre style="margin: 0;">-<span id="LC350" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to Note [Do not unpack class dictionaries], the few unboxing</span></span>
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- opportunities on dicts it prohibits are probably irrelevant to CPR.</span></span>
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="haskell"> <span class="n" style="color: #333;">has_inlineable_prag</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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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Analysing a binding (one-round, the non-recursive case)</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC309" class="line" lang="haskell"><span class="cd">-- | Process the RHS of the binding for a sensible arity, add the CPR signature</span></span>
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<pre style="margin: 0;"> <span id="LC310" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to the Id, and augment the environment with the signature as well.</span></span>
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<pre style="margin: 0;"> <span id="LC311" class="line" lang="haskell"><span class="n" style="color: #333;">cprAnalBind</span></span>
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<pre style="margin: 0;"> <span id="LC312" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span></span>
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span></span>
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Widening</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ We want to specify 'depthWidening' in fixed-point iteration</span></span>
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<pre style="margin: 0;"> <span id="LC315" 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;">CprType</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="kt" style="color: #458; font-weight: 600;">Id</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="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC362" 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;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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363
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"><span class="n" style="color: #333;">cprAnalBind</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">args</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="LC364" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">id'</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="LC318" 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;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"><span class="n" style="color: #333;">cprAnalBind</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">widening</span> <span class="n" style="color: #333;">args</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="LC320" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR for expandable unfoldings]</span></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">cprExpandUnfolding_maybe</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">id</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC323" 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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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">id'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">env'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="p">(</span><span class="n" style="color: #333;">splitFunNewTys</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We compute the Termination and CPR transformer based on the strictness</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">@@ -387,16 +347,13 @@ cprAnalBind top_lvl env args id rhs</td>
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">stays_thunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">trimCprTy</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR for sum types]</span></span>
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">returns_sum</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">trimCprTy</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR for expandable unfoldings]</span></span>
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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">will_expand</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">topCprType</span></span>
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<pre style="margin: 0;"> <span id="LC350" 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;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Arity trimming for CPR signatures]</span></span>
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We prune so that we discard too deep info on e.g. TyCon bindings</span></span>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ae_dflags</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;">-<span id="LC397" 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;"><span class="idiff left">pruneSig</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mAX_DEPTH</span></span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkCprSigForArity</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty'</span></span>
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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">id'</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "cprAnalBind" (ppr id $$ ppr sig) $</span></span>
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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">setIdCprInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">sig</span></span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">widening</span></span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkCprSigForArity</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty'</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">id'</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env'</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "cprAnalBind" (ppr id $$ ppr sig) $</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">setIdCprInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sig</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">extendSigEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sig</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR for thunks]</span></span>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"> <span class="n" style="color: #333;">stays_thunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">is_thunk</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not_strict</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="406" 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">@@ -406,8 +363,18 @@ cprAnalBind top_lvl env args id rhs</td>
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<pre style="margin: 0;"> <span id="LC363" 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;">ret_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitPiTys</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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407
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"> <span class="n" style="color: #333;">not_a_prod</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNothing</span> <span class="p">(</span><span class="n" style="color: #333;">deepSplitProductType_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">ae_fam_envs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">ret_ty</span><span class="p">)</span></span>
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408
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"> <span class="n" style="color: #333;">returns_sum</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTopLevel</span> <span class="n" style="color: #333;">top_lvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not_a_prod</span></span>
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409
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR for expandable unfoldings]</span></span>
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<pre style="margin: 0;">-<span id="LC410" class="line" lang="haskell"> <span class="n" style="color: #333;">will_expand</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">cprExpandUnfolding_maybe</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"><span class="n" style="color: #333;">unboxingStrategy</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;">UnboxingStrategy</span></span>
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368
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="n" style="color: #333;">unboxingStrategy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">dmd</span></span>
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369
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prj</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">wantToUnbox</span> <span class="p">(</span><span class="n" style="color: #333;">ae_fam_envs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">has_inlineable_prag</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">dmd</span></span>
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370
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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371
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"> <span class="n" style="color: #333;">prj</span> <span class="p">(</span><span class="n" style="color: #333;">dmds</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DataConAppContext</span> <span class="p">{</span> <span class="n" style="color: #333;">dcac_dc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">dcac_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tys_w_str</span> <span class="p">})</span></span>
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372
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">tys_w_str</span><span class="p">,</span> <span class="n" style="color: #333;">dmds</span><span class="p">)</span></span>
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373
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Rather than maintaining in AnalEnv whether we are in an INLINEABLE</span></span>
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374
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- function, we just assume that we aren't. That flag is only relevant</span></span>
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375
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to Note [Do not unpack class dictionaries], the few unboxing</span></span>
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376
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- opportunities on dicts it prohibits are probably irrelevant to CPR.</span></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"> <span class="n" style="color: #333;">has_inlineable_prag</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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378
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"><span class="n" style="color: #333;">cprExpandUnfolding_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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413
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"><span class="n" style="color: #333;">cprExpandUnfolding_maybe</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="416" 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="383" 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">@@ -416,6 +383,58 @@ cprExpandUnfolding_maybe id = do</td>
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383
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">isActiveIn</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">idInlineActivation</span> <span class="n" style="color: #333;">id</span><span class="p">))</span></span>
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417
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell"> <span class="n" style="color: #333;">expandUnfolding_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">idUnfolding</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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418
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385
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"></span>
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386
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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387
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Analysing recursive bindings</span></span>
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388
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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389
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"><span class="cd">-- | Fixed-point iteration</span></span>
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"><span class="n" style="color: #333;">cprFix</span></span>
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span></span>
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="c1" style="color: #998; font-style: italic;">-- Does not include bindings for this binding</span></span>
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<pre style="margin: 0;">+<span id="LC394" 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;">CprType</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC395" 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;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC396" 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;">AnalEnv</span><span class="p">,</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)])</span> <span class="c1" style="color: #998; font-style: italic;">-- Binders annotated with stricness info</span></span>
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"><span class="n" style="color: #333;">cprFix</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">orig_pairs</span></span>
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loop</span> <span class="mi" style="color: #099;">1</span> <span class="n" style="color: #333;">initial_pairs</span></span>
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell"> <span class="n" style="color: #333;">init_sig</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">cprExpandUnfolding_maybe</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">topCprSig</span></span>
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402
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<pre style="margin: 0;">+<span id="LC402" 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;">mkCprSig</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="n" style="color: #333;">divergeCpr</span></span>
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Initialising strictness] in GHC.Core.Opt.DmdAnal</span></span>
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell"> <span class="n" style="color: #333;">initial_pairs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ae_virgin</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;">setIdCprInfo</span> <span class="n" style="color: #333;">id</span> <span class="p">(</span><span class="n" style="color: #333;">init_sig</span> <span class="n" style="color: #333;">id</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="p">(</span><span class="n" style="color: #333;">id</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;">orig_pairs</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC405" 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;">orig_pairs</span></span>
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The fixed-point varies the idCprInfo field of the binders, and terminates if that</span></span>
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408
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<pre style="margin: 0;">+<span id="LC408" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- annotation does not change any more.</span></span>
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"> <span class="n" style="color: #333;">loop</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="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</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;">AnalEnv</span><span class="p">,</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)])</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"> <span class="n" style="color: #333;">loop</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">found_fixpoint</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">final_anal_env</span><span class="p">,</span> <span class="n" style="color: #333;">pairs'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC412" 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="c1" style="color: #998; font-style: italic;">-- pprTrace "cprFix:loop" (ppr n <+> ppr (map fst pairs)) $</span></span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"> <span class="n" style="color: #333;">loop</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">pairs'</span></span>
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="haskell"> <span class="n" style="color: #333;">found_fixpoint</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">selector</span> <span class="n" style="color: #333;">pairs'</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">selector</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">+<span id="LC416" class="line" lang="haskell"> <span class="n" style="color: #333;">selector</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">idCprInfo</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fst</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="haskell"> <span class="n" style="color: #333;">first_round</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="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="haskell"> <span class="n" style="color: #333;">pairs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">step</span> <span class="n" style="color: #333;">first_round</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="haskell"> <span class="n" style="color: #333;">final_anal_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendSigEnvs</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">pairs'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC420" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC421" class="line" lang="haskell"> <span class="n" style="color: #333;">step</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</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;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="haskell"> <span class="n" style="color: #333;">step</span> <span class="n" style="color: #333;">first_round</span> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pairs'</span></span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In all but the first iteration, delete the virgin flag</span></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"> <span class="n" style="color: #333;">start_env</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">first_round</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="LC426" 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;">nonVirgin</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;">+<span id="LC427" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC428" class="line" lang="haskell"> <span class="n" style="color: #333;">start</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendSigEnvs</span> <span class="n" style="color: #333;">start_env</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">pairs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC429" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC430" 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;">pairs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAccumL</span> <span class="n" style="color: #333;">anal_bind</span> <span class="n" style="color: #333;">start</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;">+<span id="LC431" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"> <span class="n" style="color: #333;">anal_bind</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">id</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="LC433" 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="p">(</span><span class="n" style="color: #333;">id'</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="LC434" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Ensuring termination of fixed-point iteration]</span></span>
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<pre style="margin: 0;">+<span id="LC436" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">id'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">env'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cprAnalBind</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">depthWidening</span> <span class="n" style="color: #333;">args</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="LC437" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Arity trimming for CPR signatures]</span></span>
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<pre style="margin: 0;"> <span id="LC439" 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="LC440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Although it doesn't affect correctness of the analysis per se, we have to trim</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">@@ -478,17 +497,17 @@ emptyAnalEnv dflags fam_envs</td>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ae_fam_envs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fam_envs</span></span>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC481" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Anal</span>Env</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;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span></span>
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<pre style="margin: 0;">-<span id="LC482" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Anal</span>Env</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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<pre style="margin: 0;">+<span id="LC500" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Sig</span>Env</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;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span></span>
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Sig</span>Env</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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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">ae_sigs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">ae_sigs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">sig</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC485" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Anal</span>EnvList</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="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span></span>
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<pre style="margin: 0;">-<span id="LC486" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Anal</span>EnvList</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ids_cprs</span></span>
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Sig</span>EnvList</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="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CprSig</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span></span>
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Sig</span>EnvList</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ids_cprs</span></span>
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">ae_sigs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarEnvList</span> <span class="p">(</span><span class="n" style="color: #333;">ae_sigs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">ids_cprs</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"><span class="cd">-- | Extend an environment with the CPR signatures attached to the id</span></span>
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<pre style="margin: 0;">-<span id="LC490" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Anal</span>Envs</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span></span>
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<pre style="margin: 0;">-<span id="LC491" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Anal</span>Envs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ids</span></span>
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Sig</span>Envs</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span></span>
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<pre style="margin: 0;">+<span id="LC510" class="line" lang="haskell"><span class="n" style="color: #333;">extend<span class="idiff left right">Sig</span>Envs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ids</span></span>
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">ae_sigs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sigs'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="haskell"> <span class="n" style="color: #333;">sigs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarEnvList</span> <span class="p">(</span><span class="n" style="color: #333;">ae_sigs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">id</span><span class="p">,</span> <span class="n" style="color: #333;">idCprInfo</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ids</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">@@ -502,7 +521,7 @@ nonVirgin env = env { ae_virgin = False }</td>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="haskell"><span class="n" style="color: #333;">extendEnvForDataAlt</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;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</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;">AnalEnv</span></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [CPR in a DataAlt case alternative]</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">extendEnvForDataAlt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">case_bndr</span> <span class="n" style="color: #333;">case_bndr_ty</span> <span class="n" style="color: #333;">dc</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC505" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extend<span class="idiff left right">Anal</span>Env</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">case_bndr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">case_bndr_ty'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extend<span class="idiff left right">Sig</span>Env</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">case_bndr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="n" style="color: #333;">case_bndr_ty'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"> <span class="n" style="color: #333;">tycon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span></span>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="haskell"> <span class="n" style="color: #333;">is_product</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">isDataProductTyCon_maybe</span> <span class="n" style="color: #333;">tycon</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">@@ -517,7 +536,7 @@ extendEnvForDataAlt env case_bndr case_bndr_ty dc bndrs</td>
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517
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536
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<pre style="margin: 0;"> <span id="LC536" 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="n" style="color: #333;">fields</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitConCprTy</span> <span class="n" style="color: #333;">dc</span> <span class="n" style="color: #333;">case_bndr_ty'</span></span>
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518
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537
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ids</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">bndrs</span></span>
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519
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538
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">cpr_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprSig</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">CprType</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="n" style="color: #333;">fields</span></span>
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<pre style="margin: 0;">-<span id="LC520" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extend<span class="idiff left right">Anal</span>EnvList</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"extendEnvForDataAlt"</span> <span class="n" style="color: #333;">ids</span> <span class="n" style="color: #333;">cpr_tys</span><span class="p">)</span></span>
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539
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extend<span class="idiff left right">Sig</span>EnvList</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"extendEnvForDataAlt"</span> <span class="n" style="color: #333;">ids</span> <span class="n" style="color: #333;">cpr_tys</span><span class="p">)</span></span>
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521
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540
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<pre style="margin: 0;"> <span id="LC540" 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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541
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span></span>
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542
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<pre style="margin: 0;"> <span id="LC542" 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">@@ -746,6 +765,14 @@ In practice, GHC generates a lot of (nested) TyCon and KindRep bindings, one</td>
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746
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for each data declaration. It's wasteful to attach CPR signatures to each of</span></span>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">them (and intractable in case of Nested CPR).</span></span>
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also we don't need to analyse RHSs of expandable bindings: The CPR signature of</span></span>
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769
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the binding is never consulted and there may not be let or case expressions</span></span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nested inside its RHS. In which case we also don't record a signature in the</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">local AnalEnv. Doing so would override looking into the unfolding. Why not give</span></span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the expandable case in cprTransform a higher priority then? Because then *all*</span></span>
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">case binders would get the CPR property, regardless of -fcase-binder-cpr-depth,</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because case binders have expandable unfoldings.</span></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Tracked by #18154.</span></span>
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [CPR examples]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/0c2eedad466fabeb8367a3d7617f13e87df9778f...3ae7eb1f530eba8e30fb85a0f5d018e15666b882#5a3376ebe9ef8294e13f1fb3761637fa76cd1558"><strong>compiler/GHC/Types/Cpr.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">@@ -318,7 +318,8 @@ conCprType con_tag args = CprType 0 (conCpr con_tag cprs)</td>
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<pre style="margin: 0;"> <span id="LC318" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="haskell"><span class="n" style="color: #333;">markOptimisticConCprType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprType</span></span>
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<pre style="margin: 0;"> <span id="LC320" class="line" lang="haskell"><span class="n" style="color: #333;">markOptimisticConCprType</span> <span class="n" style="color: #333;">dc</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;">CprType</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">cpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">_ty</span> <span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">CprType</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">optimisticConCpr</span> <span class="n" style="color: #333;">con_tag</span> <span class="n" style="color: #333;">fields</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTraceWith "markOptimisticConCpr" (\ty' -> ppr _ty $$ ppr ty') $</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">_ty</span> <span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">CprType</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">optimisticConCpr</span> <span class="n" style="color: #333;">con_tag</span> <span class="n" style="color: #333;">fields</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell"> <span class="n" style="color: #333;">con_tag</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConTag</span> <span class="n" style="color: #333;">dc</span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"> <span class="n" style="color: #333;">wkr_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConRepArity</span> <span class="n" style="color: #333;">dc</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">@@ -364,8 +365,9 @@ trimCprTy :: CprType -> CprType</td>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"><span class="n" style="color: #333;">trimCprTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprType</span> <span class="n" style="color: #333;">arty</span> <span class="n" style="color: #333;">cpr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CprType</span> <span class="n" style="color: #333;">arty</span> <span class="p">(</span><span class="n" style="color: #333;">trimCpr</span> <span class="n" style="color: #333;">cpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC366" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC367" class="line" lang="haskell"><span class="n" style="color: #333;">zonkOptimisticCprTy</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;">CprType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CprType</span></span>
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<pre style="margin: 0;">-<span id="LC367" class="line" lang="haskell"><span class="n" style="color: #333;">zonkOptimisticCprTy</span> <span class="n" style="color: #333;">max_depth</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CprType</span> <span class="n" style="color: #333;">arty</span> <span class="n" style="color: #333;">cpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CprType</span> <span class="n" style="color: #333;">arty</span> <span class="p">(</span><span class="n" style="color: #333;">zonk</span> <span class="n" style="color: #333;">max_depth</span> <span class="n" style="color: #333;">cpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="n" style="color: #333;">zonkOptimisticCprTy</span> <span class="n" style="color: #333;">max_depth</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;">CprType</span> <span class="n" style="color: #333;">arty</span> <span class="n" style="color: #333;">cpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTraceWith "zonkOptimisticCprTy" (\ty' -> ppr max_depth <+> ppr _ty <+> ppr ty') $</span></span>
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CprType</span> <span class="n" style="color: #333;">arty</span> <span class="p">(</span><span class="n" style="color: #333;">zonk</span> <span class="n" style="color: #333;">max_depth</span> <span class="n" style="color: #333;">cpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | The Int is the amount of "fuel" left; when it reaches 0, we no longer</span></span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- turn OptimisticCpr into Cpr, but into NoMoreCpr.</span></span>
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