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<h3>
Marge Bot pushed to branch master
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/101fab6ee6cee72b9ffce40e45ebf39466d1c01a">101fab6e</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-04-09T23:11:21-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Special case `isConstraintKindCon` on `AlgTyCon`
Previously, the `tyConUnique` record selector would unfold into a huge
case expression that would be inlined in all call sites, such as the
`INLINE`-annotated `coreView`, see #18026. `constraintKindTyConKey` only
occurs as the `Unique` of an `AlgTyCon` anyway, so we can make the code
a lot more compact, but have to move it to GHC.Core.TyCon.
Metric Decrease:
T12150
T12234
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<h4>3 changed files:</h4>
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<li class="file-stats">
<a href="#4aad0050db1a8a20db8bbca149111de99cb299c9">
compiler/GHC/Core/TyCon.hs
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<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<li class="file-stats">
<a href="#0ceba1cc065fc4d13769caf47b225c97d54e2ffc">
compiler/prelude/TysWiredIn.hs
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<h4>Changes:</h4>
<li id="4aad0050db1a8a20db8bbca149111de99cb299c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/101fab6ee6cee72b9ffce40e45ebf39466d1c01a#4aad0050db1a8a20db8bbca149111de99cb299c9"><strong>compiler/GHC/Core/TyCon.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">@@ -45,7 +45,7 @@ module GHC.Core.TyCon(</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"> <span class="n" style="color: #333;">noTcTyConScopedTyVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Predicates on TyCons</span></span>
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<pre style="margin: 0;">-<span id="LC48" class="line" lang="haskell"> <span class="n" style="color: #333;">isAlgTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">isVanillaAlgTyCon</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"> <span class="n" style="color: #333;">isAlgTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">isVanillaAlgTyCon</span><span class="p">,</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">isConstraintKindCon</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="n" style="color: #333;">isClassTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">isFamInstTyCon</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"> <span class="n" style="color: #333;">isFunTyCon</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="n" style="color: #333;">isPrimTyCon</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1868" 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">@@ -1868,6 +1868,15 @@ isVanillaAlgTyCon :: TyCon -> Bool</td>
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1868
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<pre style="margin: 0;"> <span id="LC1868" class="line" lang="haskell"><span class="n" style="color: #333;">isVanillaAlgTyCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AlgTyCon</span> <span class="p">{</span> <span class="n" style="color: #333;">algTcParent</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">VanillaAlgTyCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1869
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<pre style="margin: 0;"> <span id="LC1869" class="line" lang="haskell"><span class="n" style="color: #333;">isVanillaAlgTyCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC1870" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1871" class="line" lang="haskell"><span class="cd">-- | Returns @True@ for the 'TyCon' of the 'Constraint' kind.</span></span>
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<pre style="margin: 0;">+<span id="LC1872" class="line" lang="haskell"><span class="n" style="color: #333;">isConstraintKindCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC1873" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: We intentionally match on AlgTyCon, because 'constraintKindTyCon' is</span></span>
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<pre style="margin: 0;">+<span id="LC1874" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- always an AlgTyCon (see 'pcTyCon' in TysWiredIn) and the record selector</span></span>
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<pre style="margin: 0;">+<span id="LC1875" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for 'tyConUnique' would generate unreachable code for every other data</span></span>
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<pre style="margin: 0;">+<span id="LC1876" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constructor of TyCon (see #18026).</span></span>
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<pre style="margin: 0;">+<span id="LC1877" class="line" lang="haskell"><span class="n" style="color: #333;">isConstraintKindCon</span> <span class="kt" style="color: #458; font-weight: 600;">AlgTyCon</span> <span class="p">{</span> <span class="n" style="color: #333;">tyConUnique</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">constraintKindTyConKey</span></span>
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<pre style="margin: 0;">+<span id="LC1878" class="line" lang="haskell"><span class="n" style="color: #333;">isConstraintKindCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC1879" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1880" class="line" lang="haskell"><span class="n" style="color: #333;">isDataTyCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC1881" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Returns @True@ for data types that are /definitely/ represented by</span></span>
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<pre style="margin: 0;"> <span id="LC1882" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- heap-allocated constructors. These are scrutinised by Core-level</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/101fab6ee6cee72b9ffce40e45ebf39466d1c01a#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.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">@@ -2924,9 +2924,6 @@ distinct uniques, they are treated as equal at all times except</td>
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2924
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<pre style="margin: 0;"> <span id="LC2924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">during type inference.</span></span>
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<pre style="margin: 0;"> <span id="LC2925" 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="LC2926" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2927" class="line" lang="haskell"><span class="n" style="color: #333;">isConstraintKindCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC2928" class="line" lang="haskell"><span class="n" style="color: #333;">isConstraintKindCon</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConUnique</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">constraintKindTyConKey</span></span>
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<pre style="margin: 0;">-<span id="LC2929" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2927" class="line" lang="haskell"><span class="cd">-- | Tests whether the given kind (which should look like @TYPE x@)</span></span>
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<pre style="margin: 0;"> <span id="LC2928" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is something other than a constructor tree (that is, constructors at every node).</span></span>
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<pre style="margin: 0;"> <span id="LC2929" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E.g. True of TYPE k, TYPE (F Int)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/101fab6ee6cee72b9ffce40e45ebf39466d1c01a#0ceba1cc065fc4d13769caf47b225c97d54e2ffc"><strong>compiler/prelude/TysWiredIn.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">@@ -639,6 +639,7 @@ typeNatKind = mkTyConTy typeNatKindCon</td>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"><span class="n" style="color: #333;">typeSymbolKind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConTy</span> <span class="n" style="color: #333;">typeSymbolKindCon</span></span>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"><span class="n" style="color: #333;">constraintKindTyCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'TyCon.isConstraintKindCon' assumes that this is an AlgTyCon!</span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"><span class="n" style="color: #333;">constraintKindTyCon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pcTyCon</span> <span class="n" style="color: #333;">constraintKindTyConName</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"><span class="n" style="color: #333;">liftedTypeKind</span><span class="p">,</span> <span class="n" style="color: #333;">typeToTypeKind</span><span class="p">,</span> <span class="n" style="color: #333;">constraintKind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span></span>
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