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<h3>
Sebastian Graf pushed to branch wip/pmcheck-eqs
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/d20ed249006bdcb9c6d65069134980a1cce8a950">d20ed249</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2019-05-20T15:20:04Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make TmOracle reduce nullary constructor equalities
Previously, `simplifyEqExpr` would just give up on constructor
applications when no argument to either constructor was simplified.
That's unfortunate as all arguments might be equal anyway! A special
case of this is nullary constructors. Currently, the TmOracle would fail
to solve a term equality `False ~ (True = True)` because it can't make
any progress on any of `True`s arguments.
Instead we now try to properly simplify the term equality even when no
simplification of constructor arguments was achieved.
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<h4>1 changed file:</h4>
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<a href="#379674a5063221cec43f0f659c2eb67b30339f45">
compiler/deSugar/TmOracle.hs
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<h4>Changes:</h4>
<li id="379674a5063221cec43f0f659c2eb67b30339f45">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/d20ed249006bdcb9c6d65069134980a1cce8a950#379674a5063221cec43f0f659c2eb67b30339f45"><strong>compiler/deSugar/TmOracle.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">@@ -210,7 +210,7 @@ simplifyEqExpr e1 e2 = case (e1, e2) of</td>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"> <span class="n" style="color: #333;">worst_case</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmExprEq</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">ts1'</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmExprCon</span> <span class="n" style="color: #333;">c2</span> <span class="n" style="color: #333;">ts2'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">if</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;">or</span> <span class="n" style="color: #333;">bs1</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">or</span> <span class="n" style="color: #333;">bs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">worst_case</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- no progress</span></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTruePmExpr</span> <span class="n" style="color: #333;">tss</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">truePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">any</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isFalsePmExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tss</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">falsePmExpr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">True</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">otherwise</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">worst_case</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">or</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bs1</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">or</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bs2</span></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="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">worst_case</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC215" 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;">falsePmExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"></span>
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