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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/de986359fa8a8ce93930d7e1f895084d45c7eae3">de986359</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-28T05:29:34-04:00</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.Primitive.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#.
Fixes #18291.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1556ebd389666417630ad833490ad042f58d75f3">1556ebd3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-28T05:29:34-04:00</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
</a>
</li>
<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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</a>
</li>
<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/0f5b3d7e6010c9c302ab9d8a7474ba89f89d3651...1556ebd389666417630ad833490ad042f58d75f3#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">@@ -729,8 +729,6 @@ lintJoinLams join_arity enforce rhs</td>
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729
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<pre style="margin: 0;"> <span id="LC729" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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730
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730
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<pre style="margin: 0;"> <span id="LC730" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lintCoreExpr</span> <span class="n" style="color: #333;">expr</span></span>
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731
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731
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">var</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;">lintLambda</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">go</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;">body</span></span>
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732
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<pre style="margin: 0;">-<span id="LC732" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- N.B. join points can be cast. e.g. we consider ((\x -> ...) `cast` ...)</span></span>
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733
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<pre style="margin: 0;">-<span id="LC733" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to be a join point at join arity 1.</span></span>
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734
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732
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">expr</span> <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;">bndr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">enforce</span> <span class="c1" style="color: #998; font-style: italic;">-- Join point with too few RHS lambdas</span></span>
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735
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<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">failWithL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkBadJoinArityMsg</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC734" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Future join point, not yet eta-expanded</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">@@ -779,36 +777,26 @@ hurts us here.</td>
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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 [Linting of runRW#]</span></span>
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<pre style="margin: 0;"> <span id="LC779" 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="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">runRW# has some very peculiar behavior (see Note [runRW magic] in</span></span>
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<pre style="margin: 0;">-<span id="LC783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.CoreToStg.Prep) which CoreLint must accommodate.</span></span>
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">runRW# has some very special behavior (see Note [runRW magic] in</span></span>
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.CoreToStg.Prep) which CoreLint must accommodate, by allowing</span></span>
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">join points in its argument. For example, this is fine:</span></span>
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As described in Note [Casts and lambdas] in</span></span>
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786
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<pre style="margin: 0;">-<span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Opt.Simplify.Utils, the simplifier pushes casts out of</span></span>
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<pre style="margin: 0;">-<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lambdas. Concretely, the simplifier will transform</span></span>
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join j x = ...</span></span>
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in runRW# (\s. case v of</span></span>
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786
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A -> j 3</span></span>
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> B -> j 4)</span></span>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# @r @ty (\s -> expr `cast` co)</span></span>
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Usually those calls to the join point 'j' would not be valid tail calls,</span></span>
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because they occur in a function argument. But in the case of runRW#</span></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">they are fine, because runRW# (\s.e) behaves operationally just like e.</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(runRW# is ultimately inlined in GHC.CoreToStg.Prep.)</span></span>
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793
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">into</span></span>
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<pre style="margin: 0;">-<span id="LC792" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# @r @ty ((\s -> expr) `cast` co)</span></span>
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794
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<pre style="margin: 0;">-<span id="LC794" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consequently we need to handle the case that the continuation is a</span></span>
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796
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<pre style="margin: 0;">-<span id="LC796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cast of a lambda. See Note [Casts and lambdas] in</span></span>
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797
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<pre style="margin: 0;">-<span id="LC797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Opt.Simplify.Utils.</span></span>
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798
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<pre style="margin: 0;">-<span id="LC798" class="line" lang="haskell"></span>
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799
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<pre style="margin: 0;">-<span id="LC799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the event that the continuation is headed by a lambda (which</span></span>
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800
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will bind the State# token) we can safely allow calls to join</span></span>
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801
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">points since CorePrep is going to apply the continuation to</span></span>
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<pre style="margin: 0;">-<span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RealWorld.</span></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the case that the continuation is not a lambda we lint the</span></span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">continuation disallowing join points, to rule out things like,</span></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the case that the continuation is /not/ a lambda we simply disable this</span></span>
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">special behaviour. For example, this is /not/ fine:</span></span>
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<pre style="margin: 0;"> <span id="LC796" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join j = ...</span></span>
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<pre style="margin: 0;">-<span id="LC808" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in runRW# @r @ty (</span></span>
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let x = jump j</span></span>
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<pre style="margin: 0;">-<span id="LC810" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in x</span></span>
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<pre style="margin: 0;">-<span id="LC811" 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="LC798" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in runRW# @r @ty (jump j)</span></span>
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC802" class="line" lang="haskell"><span class="cm" 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">@@ -929,10 +917,6 @@ lintCoreExpr e@(App _ _)</td>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">fun_ty2</span><span class="p">,</span> <span class="n" style="color: #333;">ue2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoreArg</span> <span class="n" style="color: #333;">fun_pair1</span> <span class="n" style="color: #333;">arg_ty2</span></span>
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Linting of runRW#]</span></span>
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreArg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LintedType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UsageEnv</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC932" class="line" lang="haskell"> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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933
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<pre style="margin: 0;">-<span id="LC933" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">ue</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC934" class="line" lang="haskell"> <span class="n" style="color: #333;">new_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCastExpr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co</span></span>
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935
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<pre style="margin: 0;">-<span id="LC935" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">new_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ue</span><span class="p">)</span></span>
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936
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920
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">expr</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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937
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921
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"> <span class="n" style="color: #333;">lintJoinLams</span> <span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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938
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922
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markAllJoinsBad</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lintCoreExpr</span> <span class="n" style="color: #333;">other</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="941" 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="925" 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">@@ -941,10 +925,6 @@ lintCoreExpr e@(App _ _)</td>
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941
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925
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<pre style="margin: 0;"> <span id="LC925" 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 class="n" style="color: #333;">ue2</span> <span class="n" style="color: #333;">ue3</span></span>
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<td class="diff-line-num old_line" data-linenumber="942" 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">
942
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<td class="diff-line-num new_line" data-linenumber="926" 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">
926
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<pre style="margin: 0;"> <span id="LC926" 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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943
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927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"></span>
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944
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<pre style="margin: 0;">-<span id="LC944" 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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<td class="diff-line-num old old_line" data-linenumber="945" 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">
945
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<td class="diff-line-num new_line old" data-linenumber="928" 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="LC945" 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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946
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<pre style="margin: 0;">-<span id="LC946" 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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947
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"></span>
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948
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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;">otherwise</span></span>
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949
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929
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<pre style="margin: 0;"> <span id="LC929" 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;">pair</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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950
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930
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<pre style="margin: 0;"> <span id="LC930" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintCoreArgs</span> <span class="n" style="color: #333;">pair</span> <span class="n" style="color: #333;">args</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/0f5b3d7e6010c9c302ab9d8a7474ba89f89d3651...1556ebd389666417630ad833490ad042f58d75f3#a5d27de4e3111a69f69902c65ecf7b3379f7c49a"><strong>compiler/GHC/CoreToStg/Prep.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="798" 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="798" 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">@@ -798,10 +798,6 @@ cpeApp top_env expr</td>
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798
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798
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<pre style="margin: 0;"> <span id="LC798" 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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799
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799
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: What about casts?</span></span>
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800
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800
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"></span>
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801
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<pre style="margin: 0;">-<span id="LC801" 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="LC802" 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="LC803" 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="LC804" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC801" 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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806
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<pre style="margin: 0;"> <span id="LC802" 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="LC803" 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">@@ -923,18 +919,33 @@ optimization (right before lowering to STG, in CorePrep), we can ensure that</td>
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">no further floating will occur. This allows us to safely inline things like</span></span>
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@runST@, which are otherwise needlessly expensive (see #10678 and #5916).</span></span>
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'runRW' is defined (for historical reasons) in GHC.Magic, with a NOINLINE</span></span>
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<pre style="margin: 0;">-<span id="LC927" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pragma. It is levity-polymorphic.</span></span>
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'runRW' has a variety of quirks:</span></span>
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * 'runRW' is known-key with a NOINLINE definition (for historical reasons) in</span></span>
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> GHC.Magic. However, its correctness needs no special treatment in GHC except</span></span>
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<pre style="margin: 0;">+<span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the special late inlining here in CorePrep and GHC.CoreToByteCode.</span></span>
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<pre style="margin: 0;">+<span id="LC927" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * It is levity-polymorphic:</span></span>
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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="LC930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# :: forall (r1 :: RuntimeRep). (o :: TYPE r)</span></span>
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<pre style="margin: 0;"> <span id="LC931" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> => (State# RealWorld -> (# State# RealWorld, o #))</span></span>
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<pre style="margin: 0;">-<span id="LC931" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> (# State# RealWorld, o #)</span></span>
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> (# State# RealWorld, o #)</span></span>
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * It has some special simplification logic to allow unboxing of results when</span></span>
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# appears in a strict context. See Note [Simplification of runRW#]</span></span>
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<pre style="margin: 0;">+<span id="LC936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> below.</span></span>
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937
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<pre style="margin: 0;"> <span id="LC937" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">It's correctness needs no special treatment in GHC except this special inlining</span></span></span>
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<pre style="margin: 0;">-<span id="LC934" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">here in CorePrep (and in GHC.CoreToByteCode).</span></span></span>
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> * Since its body is inlined, we allow runRW#'s argument to be a join point.</span></span></span>
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> That is, the following is allowed:</span></span></span>
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<pre style="margin: 0;"> <span id="LC940" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, there are a variety of optimisation opportunities that the simplifier</span></span>
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<pre style="margin: 0;">-<span id="LC937" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">takes advantage of. See Note [Simplification of runRW#].</span></span>
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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join j = \s -> ...</span></span>
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in runRW# @_ @_ j</span></span>
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The Core Linter knows about this. See Note [Linting of runRW#] in</span></span>
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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> GHC.Core.Lint for details.</span></span>
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The occurrence analyser and SetLevels also know about this, as described in</span></span>
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<pre style="margin: 0;">+<span id="LC948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Simplification of runRW#].</span></span>
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Simplification of runRW#]</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">@@ -950,7 +961,7 @@ contexts into runRW's continuation. That is, it transforms</td>
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> K[ runRW# @r @ty cont ]</span></span>
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963
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<pre style="margin: 0;"> <span id="LC963" 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="LC953" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# @r @ty <span class="idiff left right">K[cont]</span></span></span>
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# @r @ty <span class="idiff left right">(\s -> K[cont s])</span></span></span>
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965
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"></span>
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966
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<pre style="margin: 0;"> <span id="LC966" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This has a few interesting implications. Consider, for instance, this program:</span></span>
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967
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<pre style="margin: 0;"> <span id="LC967" 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">@@ -973,10 +984,17 @@ completely fine. Both occurrence analysis and Core Lint have special treatment</td>
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<pre style="margin: 0;"> <span id="LC984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for runRW# applications. See Note [Linting of runRW#] for details on the latter.</span></span>
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974
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985
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<pre style="margin: 0;"> <span id="LC985" class="line" lang="haskell"></span>
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975
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986
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<pre style="margin: 0;"> <span id="LC986" 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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976
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<pre style="margin: 0;">-<span id="LC976" 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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977
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<pre style="margin: 0;">-<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with straight-line). Consequently, GHC.Core.Opt.SetLevels.lvlApp has special</span></span>
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978
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">treatment for runRW# applications, ensure the arguments are not floated if</span></span>
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979
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<pre style="margin: 0;">-<span id="LC979" 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="LC987" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For instance, if we have</span></span>
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<pre style="margin: 0;">+<span id="LC988" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC989" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> runRW# (\s -> do_something)</span></span>
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<pre style="margin: 0;">+<span id="LC990" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where do_something contains only top-level free variables, we may be tempted to</span></span>
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">float the argument to the top-level. However, we must resist this urge as since</span></span>
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<pre style="margin: 0;">+<span id="LC993" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">doing so would then require that runRW# lower to a call, whereas we would</span></span>
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<pre style="margin: 0;">+<span id="LC994" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">otherwise end up with straight-line code. Consequently,</span></span>
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<pre style="margin: 0;">+<span id="LC995" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Opt.SetLevels.lvlApp has special treatment for runRW# applications,</span></span>
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<pre style="margin: 0;">+<span id="LC996" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ensure the arguments are not floated as MFEs.</span></span>
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<pre style="margin: 0;">+<span id="LC997" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC998" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC999" 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="LC1000" 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/0f5b3d7e6010c9c302ab9d8a7474ba89f89d3651...1556ebd389666417630ad833490ad042f58d75f3#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="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Magic</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" 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="LC7" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/0f5b3d7e6010c9c302ab9d8a7474ba89f89d3651...1556ebd389666417630ad833490ad042f58d75f3#6b1c188363067aa37c05e3a281dad45535511b14"><strong>testsuite/tests/codeGen/should_compile/all.T</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">@@ -91,6 +91,7 @@ test('T17648', normal, makefile_test, [])</td>
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91
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<pre style="margin: 0;"> <span id="LC91" 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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92
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92
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18227A</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>
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93
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93
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18227B</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>
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<pre style="margin: 0;">+<span id="LC94" 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>
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94
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95
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15570</span><span class="p">',</span></span>
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95
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96
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="perl"> <span class="nv" style="color: #008080;">when</span><span class="p">(</span><span class="nv" style="color: #008080;">unregisterised</span><span class="p">(),</span> <span class="nv" style="color: #008080;">skip</span><span class="p">),</span></span>
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96
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97
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="perl"> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-Wno-overflowed-literals</span><span class="p">'])</span></span>
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