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<h3>
Ben Gamari pushed to branch ghc-9.0
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/5ccf44c6f0e27e83bf2828f0834bb790b1834929">5ccf44c6</a></strong>
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<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-24T21:35:48-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix types in silly shifts (#18589)
Patch written by Simon. I have only added a testcase.
(cherry picked from commit 364258e0ad25bc95e69745554f5ca831ce80baf8)
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<h4>3 changed files:</h4>
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<a href="#aa79261abf782f3dc603af7fbd5c4b08ed3ddb88">
compiler/GHC/Core/Opt/ConstantFold.hs
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testsuite/tests/simplCore/should_compile/T18589.hs
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<a href="#fc07c260b75644727a8cdc1af5c861a44d4bfb5e">
testsuite/tests/simplCore/should_compile/all.T
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<h4>Changes:</h4>
<li id="aa79261abf782f3dc603af7fbd5c4b08ed3ddb88">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ccf44c6f0e27e83bf2828f0834bb790b1834929#aa79261abf782f3dc603af7fbd5c4b08ed3ddb88"><strong>compiler/GHC/Core/Opt/ConstantFold.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">@@ -140,11 +140,11 @@ primOpRules nm = \case</td>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inversePrimOp</span> <span class="kt" style="color: #458; font-weight: 600;">NotIOp</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IntNegOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">1</span> <span class="p">[</span> <span class="n" style="color: #333;">unaryLit</span> <span class="n" style="color: #333;">negOp</span></span>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inversePrimOp</span> <span class="kt" style="color: #458; font-weight: 600;">IntNegOp</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ISllOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">2</span> <span class="p">[</span> <span class="n" style="color: #333;">shiftRule</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Bits</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">shiftL</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ISllOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">2</span> <span class="p">[</span> <span class="n" style="color: #333;">shiftRule</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LitNumInt</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Bits</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">shiftL</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rightIdentityPlatform</span> <span class="n" style="color: #333;">zeroi</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC145" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ISraOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">2</span> <span class="p">[</span> <span class="n" style="color: #333;">shiftRule</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Bits</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">shiftR</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ISraOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">2</span> <span class="p">[</span> <span class="n" style="color: #333;">shiftRule</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LitNumInt</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Bits</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">shiftR</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rightIdentityPlatform</span> <span class="n" style="color: #333;">zeroi</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ISrlOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">2</span> <span class="p">[</span> <span class="n" style="color: #333;">shiftRule</span> <span class="n" style="color: #333;">shiftRightLogical</span></span>
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ISrlOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">2</span> <span class="p">[</span> <span class="n" style="color: #333;">shiftRule</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LitNumInt</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">shiftRightLogical</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rightIdentityPlatform</span> <span class="n" style="color: #333;">zeroi</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Word operations</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">@@ -186,8 +186,8 @@ primOpRules nm = \case</td>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">equalArgs</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">retLit</span> <span class="n" style="color: #333;">zerow</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NotOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">1</span> <span class="p">[</span> <span class="n" style="color: #333;">unaryLit</span> <span class="n" style="color: #333;">complementOp</span></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inversePrimOp</span> <span class="kt" style="color: #458; font-weight: 600;">NotOp</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SllOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">2</span> <span class="p">[</span> <span class="n" style="color: #333;">shiftRule</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Bits</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">shiftL</span><span class="p">)</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SrlOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">2</span> <span class="p">[</span> <span class="n" style="color: #333;">shiftRule</span> <span class="n" style="color: #333;">shiftRightLogical</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SllOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">2</span> <span class="p">[</span> <span class="n" style="color: #333;">shiftRule</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LitNumWord</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Bits</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">shiftL</span><span class="p">)</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SrlOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">2</span> <span class="p">[</span> <span class="n" style="color: #333;">shiftRule</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LitNumWord</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">shiftRightLogical</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- coercions</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Word2IntOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkPrimOpRule</span> <span class="n" style="color: #333;">nm</span> <span class="mi" style="color: #099;">1</span> <span class="p">[</span> <span class="n" style="color: #333;">liftLitPlatform</span> <span class="n" style="color: #333;">word2IntLit</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">@@ -474,12 +474,14 @@ wordOpC2 op env (LitNumber LitNumWord w1) (LitNumber LitNumWord w2) =</td>
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<pre style="margin: 0;"> <span id="LC474" class="line" lang="haskell"> <span class="n" style="color: #333;">wordCResult</span> <span class="p">(</span><span class="n" style="color: #333;">roPlatform</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">fromInteger</span> <span class="n" style="color: #333;">w1</span> <span class="p">`</span><span class="n" style="color: #333;">op</span><span class="p">`</span> <span class="n" style="color: #333;">fromInteger</span> <span class="n" style="color: #333;">w2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell"><span class="n" style="color: #333;">wordOpC2</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</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;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC477" class="line" lang="haskell"><span class="n" style="color: #333;">shiftRule</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Platform</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Integer</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Integer</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RuleM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC477" class="line" lang="haskell"><span class="n" style="color: #333;">shiftRule</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LitNumType</span> <span class="c1" style="color: #998; font-style: italic;">-- Type of the result, either LitNumInt or LitNumWord</span></span>
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<pre style="margin: 0;">+<span id="LC478" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Platform</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Integer</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Integer</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC479" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RuleM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Shifts take an Int; hence third arg of op is Int</span></span>
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<pre style="margin: 0;"> <span id="LC481" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used for shift primops</span></span>
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<pre style="margin: 0;">-<span id="LC480" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ISllOp, ISraOp, ISrlOp :: <span class="idiff left right">Word# -> Int# -> Word</span>#</span></span>
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<pre style="margin: 0;">+<span id="LC482" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ISllOp, ISraOp, ISrlOp :: <span class="idiff left right">Int# -> Int# -> Int</span>#</span></span>
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<pre style="margin: 0;"> <span id="LC483" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- SllOp, SrlOp :: Word# -> Int# -> Word#</span></span>
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<pre style="margin: 0;">-<span id="LC482" class="line" lang="haskell"><span class="n" style="color: #333;">shiftRule</span> <span class="n" style="color: #333;">shift_op</span></span>
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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"><span class="n" style="color: #333;">shiftRule</span> <span class="n" style="color: #333;"><span class="idiff left">lit_num_ty</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">shift_op</span></span>
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<pre style="margin: 0;"> <span id="LC485" 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;">platform</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPlatform</span></span>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"> <span class="p">;</span> <span class="p">[</span><span class="n" style="color: #333;">e1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitNumber</span> <span class="kt" style="color: #458; font-weight: 600;">LitNumInt</span> <span class="n" style="color: #333;">shift_len</span><span class="p">)]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getArgs</span></span>
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">e1</span> <span class="kr" style="font-weight: 600;">of</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">@@ -487,7 +489,9 @@ shiftRule shift_op</td>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">e1</span></span>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Guarding against silly shifts]</span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">shift_len</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">shift_len</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">toInteger</span> <span class="p">(</span><span class="n" style="color: #333;">platformWordSizeInBits</span> <span class="n" style="color: #333;">platform</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC490" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkLitNumberWrap</span> <span class="n" style="color: #333;">platform</span> <span class="kt" style="color: #458; font-weight: 600;">LitNumInt</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkLitNumberWrap</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">lit_num_ty</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Be sure to use lit_num_ty here, so we get a correctly typed zero</span></span>
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of type Int# or Word# resp. See #18589</span></span>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC496" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do the shift at type Integer, but shift length is Int</span></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitNumber</span> <span class="n" style="color: #333;">nt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ccf44c6f0e27e83bf2828f0834bb790b1834929#0efe9de3d071bb55a4e5929046bbe148bbd61818"><strong>testsuite/tests/simplCore/should_compile/T18589.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;">T18589</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.Prim</span></span>
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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="c1" style="color: #998; font-style: italic;">-- See Note [Guarding against silly shifts]</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Make sure that a silly shift is optimized correctly</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">f1</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uncheckedIShiftL</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">f2</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uncheckedIShiftRA</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">f3</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uncheckedIShiftRL</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">f4</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uncheckedShiftL</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">f5</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uncheckedShiftRL</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ccf44c6f0e27e83bf2828f0834bb790b1834929#fc07c260b75644727a8cdc1af5c861a44d4bfb5e"><strong>testsuite/tests/simplCore/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">@@ -332,3 +332,4 @@ test('T18328', [ only_ways(['optasm']), grep_errmsg(r'Arity=') ], compile, ['-dd</td>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18347</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;">-dcore-lint -O</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18355</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">grep_errmsg</span><span class="p">(</span><span class="nv" style="color: #008080;">r</span><span class="p">'</span><span class="s1" style="color: #d14;">OneShot</span><span class="p">')</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 -ddump-simpl -dsuppress-uniques</span><span class="p">'])</span></span>
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334
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18399</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;">-dcore-lint -O</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18589</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;">-dcore-lint -O</span><span class="p">'])</span></span></pre>
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