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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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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8790dbc7d084d91f2bcbf9297e5ec3c2cf1ccf02">8790dbc7</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-05-28T11:02:52+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Regard all arity 0 bindings (incl. DataCon apps) as thunks
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<h4>1 changed file:</h4>
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<a href="#c1bf6b849619bc8d7ef37a97d993dbfaa9966f7b">
compiler/GHC/Core/Opt/CprAnal.hs
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<h4>Changes:</h4>
<li id="c1bf6b849619bc8d7ef37a97d993dbfaa9966f7b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8790dbc7d084d91f2bcbf9297e5ec3c2cf1ccf02#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">@@ -25,7 +25,7 @@ import GHC.Types.Basic</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id.Info</span></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">exprIsHNF</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">dumpIdInfoOfProgram</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">dumpIdInfoOfProgram</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FamInstEnv</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">@@ -357,7 +357,7 @@ cprAnalBind top_lvl env widening args id rhs</td>
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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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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell"> <span class="n" style="color: #333;">is_thunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">exprIsHNF</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs</span></span><span class="p"><span class="idiff right">)</span></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;">isJoinId</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"> <span class="n" style="color: #333;">is_thunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">idArity</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">==</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff right">0</span></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;">isJoinId</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"> <span class="n" style="color: #333;">not_strict</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;">isStrictDmd</span> <span class="p">(</span><span class="n" style="color: #333;">idDemandInfo</span> <span class="n" style="color: #333;">id</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC362" 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="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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