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<h3>
Ben Gamari pushed to branch wip/T18232
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/2d02613c20928559c27869ed16c5d90048436fa9">2d02613c</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-05-26T14:17:28-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rip out CmmStackInfo(updfr_space)
As noted in #18232, this field is currently completely unused and
moreover doesn't have a clear meaning.
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<h4>5 changed files:</h4>
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<a href="#f73a4fa90a8eb153bccdcfcc9f63c15edcd66785">
compiler/GHC/Cmm.hs
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<li class="file-stats">
<a href="#066085df29cc928ac539d8feae6e5215cbbf1e14">
compiler/GHC/Cmm/LayoutStack.hs
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<a href="#bbf4b351b327473b112c1d212f720f929c5ce247">
compiler/GHC/Cmm/Ppr.hs
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<li class="file-stats">
<a href="#29a1593e7281c8a9103a19e3a7562e2365e23b47">
compiler/GHC/Cmm/ProcPoint.hs
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<li class="file-stats">
<a href="#f117e9b1b1b9964c4d89aa403162f1c388114cda">
compiler/GHC/StgToCmm/Monad.hs
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<h4>Changes:</h4>
<li id="f73a4fa90a8eb153bccdcfcc9f63c15edcd66785">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d02613c20928559c27869ed16c5d90048436fa9#f73a4fa90a8eb153bccdcfcc9f63c15edcd66785"><strong>compiler/GHC/Cmm.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">@@ -132,9 +132,6 @@ data CmmStackInfo</td>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- number of bytes of arguments on the stack on entry to the</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the proc. This is filled in by GHC.StgToCmm.codeGen, and</span></span>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- used by the stack allocator later.</span></span>
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<pre style="margin: 0;">-<span id="LC135" class="line" lang="haskell"> <span class="n" style="color: #333;">updfr_space</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">ByteOff</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC136" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- XXX: this never contains anything useful, but it should.</span></span>
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<pre style="margin: 0;">-<span id="LC137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See comment in GHC.Cmm.LayoutStack.</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="n" style="color: #333;">do_layout</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do automatic stack layout for this proc. This is</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True for all code generated by the code generator,</span></span>
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<li id="066085df29cc928ac539d8feae6e5215cbbf1e14">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d02613c20928559c27869ed16c5d90048436fa9#066085df29cc928ac539d8feae6e5215cbbf1e14"><strong>compiler/GHC/Cmm/LayoutStack.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">@@ -357,10 +357,9 @@ isGcJump _something_else = False</td>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This doesn't seem right somehow. We need to find out whether this</span></span>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- proc will push some update frame material at some point, so that we</span></span>
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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can avoid using that area of the stack for spilling. The</span></span>
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- updfr_space field of the CmmProc *should* tell us, but it doesn't</span></span>
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (I think maybe it gets filled in later when we do proc-point</span></span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- splitting).</span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can avoid using that area of the stack for spilling. Ideally we would</span></span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- capture this information in the CmmProc (e.g. in CmmStackInfo; see #18232</span></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for details on one ill-fated attempt at this).</span></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- So we'll just take the max of all the cml_ret_offs. This could be</span></span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unnecessarily pessimistic, but probably not in the code we</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d02613c20928559c27869ed16c5d90048436fa9#bbf4b351b327473b112c1d212f720f929c5ce247"><strong>compiler/GHC/Cmm/Ppr.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">@@ -103,9 +103,8 @@ instance Outputable CmmGraph where</td>
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103
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Outputting types Cmm contains</span></span>
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104
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104
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"></span>
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105
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"><span class="n" style="color: #333;">pprStackInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CmmStackInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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106
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="haskell"><span class="n" style="color: #333;">pprStackInfo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StackInfo</span> <span class="p">{</span><span class="n" style="color: #333;">arg_space</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">arg_space</span><span class="p">,</span> <span class="n" style="color: #333;">updfr_space</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">updfr_space</span><span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></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;">text</span> <span class="s" style="color: #d14;">"arg_space: "</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg_space</span> <span class="o" style="font-weight: 600;"><+></span></span>
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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;">text</span> <span class="s" style="color: #d14;">"updfr_space: "</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">updfr_space</span></span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"><span class="n" style="color: #333;">pprStackInfo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StackInfo</span> <span class="p">{</span><span class="n" style="color: #333;">arg_space</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">arg_space</span><span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"arg_space: "</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg_space</span></span>
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109
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"><span class="n" style="color: #333;">pprTopInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CmmTopInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"><span class="n" style="color: #333;">pprTopInfo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TopInfo</span> <span class="p">{</span><span class="n" style="color: #333;">info_tbls</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">info_tbl</span><span class="p">,</span> <span class="n" style="color: #333;">stack_info</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">stack_info</span><span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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<li id="29a1593e7281c8a9103a19e3a7562e2365e23b47">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d02613c20928559c27869ed16c5d90048436fa9#29a1593e7281c8a9103a19e3a7562e2365e23b47"><strong>compiler/GHC/Cmm/ProcPoint.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="356" 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="356" 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">@@ -356,7 +356,6 @@ splitAtProcPoints dflags entry_label callPPs procPoints procMap</td>
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356
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<pre style="margin: 0;"> <span id="LC356" class="line" lang="haskell"> <span class="n" style="color: #333;">g'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">replacePPIds</span> <span class="n" style="color: #333;">g</span></span>
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357
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"> <span class="n" style="color: #333;">live</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppLiveness</span> <span class="p">(</span><span class="n" style="color: #333;">g_entry</span> <span class="n" style="color: #333;">g'</span><span class="p">)</span></span>
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358
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"> <span class="n" style="color: #333;">stack_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StackInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">arg_space</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span></span>
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359
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">updfr_space</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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360
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">do_layout</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- cannot use panic, this is printed by -ddump-cmm</span></span>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d02613c20928559c27869ed16c5d90048436fa9#f117e9b1b1b9964c4d89aa403162f1c388114cda"><strong>compiler/GHC/StgToCmm/Monad.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">@@ -762,8 +762,7 @@ emitProcWithConvention conv mb_info lbl args blocks</td>
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<pre style="margin: 0;"> <span id="LC762" class="line" lang="haskell"><span class="n" style="color: #333;">emitProc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CmmInfoTable</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CLabel</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">GlobalReg</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmAGraphScoped</span></span>
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<pre style="margin: 0;"> <span id="LC763" class="line" lang="haskell"> <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;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FCode</span> <span class="nb" style="color: #0086b3;">()</span></span>
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764
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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"><span class="n" style="color: #333;">emitProc</span> <span class="n" style="color: #333;">mb_info</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">live</span> <span class="n" style="color: #333;">blocks</span> <span class="n" style="color: #333;">offset</span> <span class="n" style="color: #333;">do_layout</span></span>
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765
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<pre style="margin: 0;">-<span id="LC765" 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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766
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<pre style="margin: 0;">-<span id="LC766" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newBlockId</span></span>
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<pre style="margin: 0;">+<span id="LC765" 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;">l</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newBlockId</span></span>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span></span>
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell"> <span class="n" style="color: #333;">blks</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CmmGraph</span></span>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"> <span class="n" style="color: #333;">blks</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">labelAGraph</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">blocks</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">@@ -772,7 +771,6 @@ emitProc mb_info lbl live blocks offset do_layout</td>
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<pre style="margin: 0;"> <span id="LC771" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapEmpty</span></span>
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<pre style="margin: 0;"> <span id="LC772" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC773" class="line" lang="haskell"> <span class="n" style="color: #333;">sinfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StackInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">arg_space</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">offset</span></span>
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<pre style="margin: 0;">-<span id="LC775" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">updfr_space</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">initUpdFrameOff</span> <span class="n" style="color: #333;">platform</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC774" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">do_layout</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">do_layout</span> <span class="p">}</span></span>
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775
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"> <span class="n" style="color: #333;">tinfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TopInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">info_tbls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">infos</span></span>
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