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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/38db4a35dac7b250d3850c47bd06452f91f7a1f6">38db4a35</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-03-18T01:08:21Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use pointer tag in dataToTag#
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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/38db4a35dac7b250d3850c47bd06452f91f7a1f6#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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38
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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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38
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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">@@ -73,10 +74,26 @@ cgExpr (StgOpApp (StgPrimOp SeqOp) [StgVarArg a, _] _res_ty) =</td>
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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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<td class="diff-line-num old old_line" data-linenumber="79" 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="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>
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82
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<pre style="margin: 0;">+<span id="LC82" 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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83
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<pre style="margin: 0;">+<span id="LC83" 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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84
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<pre style="margin: 0;">+<span id="LC84" 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="LC85" 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="LC86" 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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87
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<pre style="margin: 0;">+<span id="LC87" 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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88
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"></span>
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89
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<pre style="margin: 0;">+<span id="LC89" 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;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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90
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"> <span class="n" style="color: #333;">emitAssign</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">result_reg</span><span class="p">)</span> </span>
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91
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</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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92
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"></span>
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93
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">zero</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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94
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<pre style="margin: 0;">+<span id="LC94" 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="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;">zero</span><span class="p">)</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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<pre style="margin: 0;">+<span id="LC95" 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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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"></span>
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97
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"></span>
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81
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98
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<pre style="margin: 0;"> <span id="LC98" 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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99
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<pre style="margin: 0;"> <span id="LC99" 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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