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<h3>
Ben Gamari pushed to branch wip/T18291
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b515038332008aec67fe5fce0e36c539b4a88686">b5150383</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-06-02T17:01:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow unsaturated runRW# applications
Previously we had a very aggressive Core Lint check which caught
unsaturated applications of runRW#. However, there is nothing
wrong with such applications and they may naturally arise in desugared
Core. For instance, the desugared Core of Data.Array.runArray# from the
`primitive` package contains:
case ($) (runRW# @_ @_) (\s -> ...) of ...
In this case it's almost certain that ($) will be inlined, turning the
application into a saturated application. However, even if this weren't
the case there isn't a problem: CorePrep (after deleting an unnecessary
case) can simply generate code in its usual way, resulting in a call to
the Haskell definition of runRW#.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18013457641f88ac0ce4d58d0d2d3b0adc1fde41">18013457</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-02T17:01:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18291
</pre>
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<h4>4 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<li class="file-stats">
<a href="#a5d27de4e3111a69f69902c65ecf7b3379f7c49a">
compiler/GHC/CoreToStg/Prep.hs
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<li class="file-stats">
<a href="#8eaecf5804f8b5c60a1dc6ff803f0292b0b65465">
<span class="new-file">
+
testsuite/tests/codeGen/should_compile/T18291.hs
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<li class="file-stats">
<a href="#6b1c188363067aa37c05e3a281dad45535511b14">
testsuite/tests/codeGen/should_compile/all.T
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<h4>Changes:</h4>
<li id="36a42448a83a9d1f6df8475f03ead2eed199dd8e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1d54ab1a3deb70ae9ed9e6770fe5c21a8c86cf45...18013457641f88ac0ce4d58d0d2d3b0adc1fde41#36a42448a83a9d1f6df8475f03ead2eed199dd8e"><strong>compiler/GHC/Core/Lint.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">@@ -923,10 +923,6 @@ lintCoreExpr e@(App _ _)</td>
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<pre style="margin: 0;"> <span id="LC923" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">app_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintValApp</span> <span class="n" style="color: #333;">arg3</span> <span class="n" style="color: #333;">fun_ty2</span> <span class="n" style="color: #333;">arg3_ty</span></span>
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924
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintCoreArgs</span> <span class="n" style="color: #333;">app_ty</span> <span class="n" style="color: #333;">rest</span> <span class="p">}</span></span>
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925
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<pre style="margin: 0;"> <span id="LC925" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC926" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fun</span></span>
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927
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<td class="diff-line-num new_line old" data-linenumber="926" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC927" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fun</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">runRWKey</span></span>
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928
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<pre style="margin: 0;">-<span id="LC928" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">failWithL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Invalid runRW# application"</span><span class="p">)</span></span>
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929
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<pre style="margin: 0;">-<span id="LC929" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC926" 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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931
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">fun_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoreFun</span> <span class="n" style="color: #333;">fun</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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932
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintCoreArgs</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span> <span class="p">}</span></span>
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<li id="a5d27de4e3111a69f69902c65ecf7b3379f7c49a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1d54ab1a3deb70ae9ed9e6770fe5c21a8c86cf45...18013457641f88ac0ce4d58d0d2d3b0adc1fde41#a5d27de4e3111a69f69902c65ecf7b3379f7c49a"><strong>compiler/GHC/CoreToStg/Prep.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="842" 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">@@ -842,10 +842,6 @@ cpeApp top_env expr</td>
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">cpe_app</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">arg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CpeApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">realWorldPrimId</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest</span><span class="p">)</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>
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: What about casts?</span></span>
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC845" class="line" lang="haskell"> <span class="n" style="color: #333;">cpe_app</span> <span class="n" style="color: #333;">_env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;">-<span id="LC846" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">f</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">runRWKey</span></span>
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<pre style="margin: 0;">-<span id="LC847" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"cpe_app(runRW#)"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC848" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="n" style="color: #333;">cpe_app</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">depth</span></span>
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">v1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fiddleCCall</span> <span class="n" style="color: #333;">v</span></span>
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">e2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupCorePrepEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">v1</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">@@ -1018,9 +1014,9 @@ for runRW# applications. See Note [Linting of runRW#] for details on the latter.</td>
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<pre style="margin: 0;"> <span id="LC1014" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Moreover, it's helpful to ensure that runRW's continuation isn't floated out</span></span>
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(since doing so would then require a call, whereas we would otherwise end up</span></span>
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<pre style="margin: 0;">-<span id="LC1021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with straight-line<span class="idiff left right">). Consequently, GHC.Core.Opt.SetLevels.lvlApp has special</span></span></span>
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<pre style="margin: 0;">-<span id="LC1022" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">treatment for runRW# applications, ensure the arguments are not floated if</span></span></span>
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<pre style="margin: 0;">-<span id="LC1023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">MFEs.</span></span>
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with straight-line<span class="idiff left right"> code). Consequently, GHC.Core.Opt.SetLevels.lvlApp has</span></span></span>
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">special treatment for runRW# applications, ensure the arguments are not floated</span></span></span>
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">as </span>MFEs.</span></span>
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Other considered designs</span></span>
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1d54ab1a3deb70ae9ed9e6770fe5c21a8c86cf45...18013457641f88ac0ce4d58d0d2d3b0adc1fde41#8eaecf5804f8b5c60a1dc6ff803f0292b0b65465"><strong>testsuite/tests/codeGen/should_compile/T18291.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18291</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">hi</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="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">hi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runRW</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">42</span></span></pre>
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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">@@ -87,3 +87,4 @@ test('T14373d', [],</td>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17648</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">makefile_test</span><span class="p">,</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">)</span></span>
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89
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17904</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18291</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O0</span><span class="p">'])</span></span></pre>
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