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<h3>
Ben Gamari pushed to branch wip/T16742
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/3c44d90954a64d83217f300e6508a21f13ccbb70">3c44d909</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-04T02:30:25Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PrelRules: Ensure that shift rule result type is correct

Previously shiftRule would always produce a wordPrimTy result, despite
the fact that some of the primops which it handled were of type
intPrimTy.
</pre>
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<h4>1 changed file:</h4>
<ul>
<li class="file-stats">
<a href="#844514241b3e1a009f66bf594cbb57fef61482fb">
compiler/prelude/PrelRules.hs
</a>
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<h4>Changes:</h4>
<li id="844514241b3e1a009f66bf594cbb57fef61482fb">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/3c44d90954a64d83217f300e6508a21f13ccbb70#844514241b3e1a009f66bf594cbb57fef61482fb"><strong>compiler/prelude/PrelRules.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="134" 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="134" 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">@@ -134,11 +134,11 @@ primOpRules nm NotIOp      = mkPrimOpRule nm 1 [ unaryLit complementOp</td>
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<pre style="margin: 0;"> <span id="LC134" 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="LC135" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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="LC136" 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="LC137" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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="LC137" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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 class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">intPrimTy</span></span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell">                                               <span class="p">,</span> <span class="n" style="color: #333;">rightIdentityDynFlags</span> <span class="n" style="color: #333;">zeroi</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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="LC139" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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 class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">intPrimTy</span></span></span>
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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;">rightIdentityDynFlags</span> <span class="n" style="color: #333;">zeroi</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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="LC141" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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 class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">intPrimTy</span></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;">rightIdentityDynFlags</span> <span class="n" style="color: #333;">zeroi</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC144" 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">@@ -180,8 +180,8 @@ primOpRules nm XorOp       = mkPrimOpRule nm 2 [ binaryLit (wordOp2 xor)</td>
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<pre style="margin: 0;"> <span id="LC180" 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="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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="LC182" 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="LC183" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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="LC184" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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="LC183" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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="n" style="color: #333;"><span class="idiff left">wordPrimTy</span></span><span class="idiff right"> </span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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="n" style="color: #333;"><span class="idiff left">wordPrimTy</span></span><span class="idiff right"> </span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC186" 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="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">primOpRules</span> <span class="n" style="color: #333;">nm</span> <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;">liftLitDynFlags</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">@@ -462,12 +462,12 @@ wordOpC2 op dflags (LitNumber LitNumWord w1 _) (LitNumber LitNumWord w2 _) =</td>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell">  <span class="n" style="color: #333;">wordCResult</span> <span class="n" style="color: #333;">dflags</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="LC463" 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 class="c1" style="color: #998; font-style: italic;">-- Could find LitLit</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC465" 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;">DynFlags</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="LC465" 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;">DynFlags</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;"><span class="idiff left">Type</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </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="LC466" 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="LC467" 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="LC468" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    ISllOp, ISraOp, ISrlOp :: Word# -> Int# -> Word#</span></span>
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<pre style="margin: 0;"> <span id="LC469" 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="LC470" 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="LC470" class="line" lang="haskell"><span class="n" style="color: #333;">shiftRule</span> <span class="n" style="color: #333;">shift_op</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">resultTy</span></span></span>
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<pre style="margin: 0;"> <span id="LC471" 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;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC472" 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="kr" style="font-weight: 600;">_</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="LC473" 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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<pre style="margin: 0;"> <span id="LC475" 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="LC476" 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="LC477" 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;">wordSizeInBits</span> <span class="n" style="color: #333;">dflags</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="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkRuntimeErrorApp</span> <span class="n" style="color: #333;">rUNTIME_ERROR_ID</span> <span class="n" style="color: #333;"><span class="idiff left right">wordPrim</span>Ty</span></span>
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<pre style="margin: 0;">+<span id="LC478" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkRuntimeErrorApp</span> <span class="n" style="color: #333;">rUNTIME_ERROR_ID</span> <span class="n" style="color: #333;"><span class="idiff left right">result</span>Ty</span></span>
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<pre style="margin: 0;"> <span id="LC479" class="line" lang="haskell">                           <span class="p">(</span><span class="s" style="color: #d14;">"Bad shift length "</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">shift_len</span><span class="p">)</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;"> <span id="LC481" 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>
</pre>
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