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<h3>
Ben Gamari pushed to branch wip/dataToTag-opt
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/d39b8d9f72b254d042fb16c00e78e23b35a6e879">d39b8d9f</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-03-18T04:10:18Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use pointer tag in dataToTag#
While looking at !2873 I noticed that dataToTag# previously didn't look
at a pointer's tag to determine its constructor. To be fair, there is a
bit of a trade-off here: using the pointer tag requires a bit more code
and another branch. On the other hand, it allows us to eliminate looking
at the info table in many cases (especially now since we tag large
constructor families; see #14373).
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<h4>1 changed file:</h4>
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<a href="#77c485508ade5a11428d9fce17204d33c5825722">
compiler/GHC/StgToCmm/Expr.hs
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<h4>Changes:</h4>
<li id="77c485508ade5a11428d9fce17204d33c5825722">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/d39b8d9f72b254d042fb16c00e78e23b35a6e879#77c485508ade5a11428d9fce17204d33c5825722"><strong>compiler/GHC/StgToCmm/Expr.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">@@ -35,6 +35,7 @@ import GHC.Stg.Syntax</td>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Cmm.Graph</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Cmm.BlockId</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Cmm</span> <span class="k" style="font-weight: 600;">hiding</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">succ</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Cmm.Utils</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">zeroExpr</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Cmm.Info</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DataCon</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">@@ -69,14 +70,39 @@ cgExpr (StgOpApp (StgPrimOp SeqOp) [StgVarArg a, _] _res_ty) =</td>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"> <span class="n" style="color: #333;">cgIdApp</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- dataToTag# :: a -> Int#</span></span>
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<pre style="margin: 0;">-<span id="LC72" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [dataToTag#<span class="idiff left right">] in primops.txt.pp</span></span></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [dataToTag#<span class="idiff left right"> magic] in PrelRules.</span></span></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"><span class="n" style="color: #333;">cgExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StgOpApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StgPrimOp</span> <span class="kt" style="color: #458; font-weight: 600;">DataToTagOp</span><span class="p">)</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">StgVarArg</span> <span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="n" style="color: #333;">_res_ty</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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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"> <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="LC76" class="line" lang="haskell"> <span class="n" style="color: #333;">emitComment</span> <span class="p">(</span><span class="n" style="color: #333;">mkFastString</span> <span class="s" style="color: #d14;">"dataToTag#"</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC76" class="line" lang="haskell"> <span class="n" style="color: #333;">tmp</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTemp</span> <span class="p">(</span><span class="n" style="color: #333;">bWord</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC77" 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;">withSequel</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AssignTo</span> <span class="p">[</span><span class="n" style="color: #333;">tmp</span><span class="p">]</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">cgIdApp</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC78" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: For small types look at the tag bits instead of reading info table</span></span>
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<pre style="margin: 0;">-<span id="LC79" class="line" lang="haskell"> <span class="n" style="color: #333;">emitReturn</span> <span class="p">[</span><span class="n" style="color: #333;">getConstrTag</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">cmmUntag</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">tmp</span><span class="p">)))]</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCgIdInfo</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"> <span class="n" style="color: #333;">tag_reg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">assignTemp</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cmmConstrTag1</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">idInfoToAmode</span> <span class="n" style="color: #333;">info</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"> <span class="n" style="color: #333;">result_reg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTemp</span> <span class="p">(</span><span class="n" style="color: #333;">bWord</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tag</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">tag_reg</span></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Here we will first check the tag bits of the pointer we were given;</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if this doesn't work then enter the closure and use the info table</span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to determine the constructor. Note that all tag bits set means that</span></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the constructor index is too large to fit in the pointer and therefore</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we must look in the info table. See Note [Tagging big families].</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"> <span class="n" style="color: #333;">slow_path</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCode</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"> <span class="n" style="color: #333;">tmp</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTemp</span> <span class="p">(</span><span class="n" style="color: #333;">bWord</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC89" 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;">withSequel</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AssignTo</span> <span class="p">[</span><span class="n" style="color: #333;">tmp</span><span class="p">]</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">cgIdApp</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: For small types look at the tag bits instead of reading info table</span></span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"> <span class="n" style="color: #333;">emitAssign</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">result_reg</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">getConstrTag</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">cmmUntag</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">tmp</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"> <span class="n" style="color: #333;">fast_path</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCode</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"> <span class="n" style="color: #333;">emitAssign</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">result_reg</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cmmSubWord</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tag</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLit</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkWordCLit</span> <span class="n" style="color: #333;">dflags</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">not_evald_tag</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zeroExpr</span> <span class="n" style="color: #333;">dflags</span></span>
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99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"> <span class="n" style="color: #333;">too_big_tag</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cmmTagMask</span> <span class="n" style="color: #333;">dflags</span></span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"> <span class="n" style="color: #333;">is_tagged</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cmmOrWord</span> <span class="n" style="color: #333;">dflags</span></span>
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<td class="diff-line-num new new_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">cmmEqWord</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tag</span> <span class="n" style="color: #333;">not_evald_tag</span><span class="p">)</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">cmmEqWord</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tag</span> <span class="n" style="color: #333;">too_big_tag</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"> <span class="n" style="color: #333;">emit</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">mkCmmIfThenElse'</span> <span class="n" style="color: #333;">slow_path</span> <span class="n" style="color: #333;">fast_path</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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104
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="n" style="color: #333;">emitReturn</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">result_reg</span><span class="p">]</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"></span>
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80
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106
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"></span>
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107
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"><span class="n" style="color: #333;">cgExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StgOpApp</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cgOpApp</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">ty</span></span>
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82
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108
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"><span class="n" style="color: #333;">cgExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StgConApp</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</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;">cgConApp</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span></span>
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