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<h3>
Marge Bot pushed to branch master
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/2ee4f36c779674f7237d730460ca83aec9a6808a">2ee4f36c</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-06-01T06:32:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cleanup OVERWRITING_CLOSURE logic
The code is just more confusing than it needs to be. We don't need to mix
the threaded check with the ldv profiling check since ldv's init already
checks for this. Hence they can be two separate checks. Taking the sanity
checking into account is also cleaner via DebugFlags.sanity. No need for
checking the DEBUG define.
The ZERO_SLOP_FOR_LDV_PROF and ZERO_SLOP_FOR_SANITY_CHECK definitions the
old code had also make things a lot more opaque IMO so I removed those.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6159559b5eb71ed7287998e954f96cdfb2d48f04">6159559b</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-06-01T06:32:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix OVERWRITING_CLOSURE assuming closures are not inherently used
The new ASSERT in LDV_recordDead() was being tripped up by MVars when
removeFromMVarBlockedQueue() calls OVERWRITING_CLOSURE() via
OVERWRITE_INFO().
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/389920858e0b9efe5234cb7dac55d06e955768f7">38992085</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-06-01T06:32:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always zero shrunk mutable array slop when profiling
When shrinking arrays in the profiling way we currently don't always zero
the leftover slop. This means we can't traverse such closures in the heap
profiler. The old Note [zeroing slop] and #8402 have some rationale for why
this is so but I belive the reasoning doesn't apply to mutable
closures. There users already have to ensure multiple threads don't step on
each other's toes so zeroing should be safe.
</pre>
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</ul>
<h4>5 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#6011cad13b19136953f8ee72df01a66623c5c1b0">
includes/Cmm.h
</a>
</li>
<li class="file-stats">
<a href="#40f83a2cddcbc1f8190b0551eb572ccf4ea88cc9">
includes/Rts.h
</a>
</li>
<li class="file-stats">
<a href="#aa19e824b3a8c24a7bf37f8352997022b14a5a0c">
includes/rts/storage/ClosureMacros.h
</a>
</li>
<li class="file-stats">
<a href="#6db965f97cbab901f493506a385bcf1283009921">
rts/PrimOps.cmm
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<li class="file-stats">
<a href="#0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273">
rts/sm/Storage.c
</a>
</li>
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<h4>Changes:</h4>
<li id="6011cad13b19136953f8ee72df01a66623c5c1b0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6947231abd8c33840860ad51699b76efd4725f0e...389920858e0b9efe5234cb7dac55d06e955768f7#6011cad13b19136953f8ee72df01a66623c5c1b0"><strong>includes/Cmm.h</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="623" 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">@@ -623,14 +623,14 @@</td>
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623
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623
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define mutArrPtrCardUp(i) (((i) + mutArrCardMask) >> MUT_ARR_PTRS_CARD_BITS)</span></span>
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<td class="diff-line-num old_line" data-linenumber="624" 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">
624
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<td class="diff-line-num new_line" data-linenumber="624" 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">
624
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC624" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define mutArrPtrsCardWords(n) ROUNDUP_BYTES_TO_WDS(mutArrPtrCardUp(n))</span></span>
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<td class="diff-line-num old_line" data-linenumber="625" 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">
625
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625
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="c"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="626" 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">
626
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<td class="diff-line-num new_line old" data-linenumber="626" 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="LC626" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING) || <span class="idiff left right">(!defined(THREADED_RTS) && defined(DEBUG)</span>)</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="627" 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">
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<td class="diff-line-num new new_line" data-linenumber="626" 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">
626
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC626" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING) || <span class="idiff left right">defined(DEBUG</span>)</span></span>
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<td class="diff-line-num old_line" data-linenumber="627" 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">
627
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<td class="diff-line-num new_line" data-linenumber="627" 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">
627
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_SIZE(c, size) foreign "C" overwritingClosureSize(c "ptr", size)</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="628" 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">
628
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<td class="diff-line-num new_line" data-linenumber="628" 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">
628
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE(c) foreign "C" overwritingClosure(c "ptr")</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="629" 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">
629
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<pre style="margin: 0;">-<span id="LC629" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_<span class="idiff left right">OFS(c,n) foreign "C" overwritingClosureOfs(c "ptr", n</span>)</span></span>
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<td class="diff-line-num new old_line" data-linenumber="630" 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">
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629
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_<span class="idiff left right">MUTABLE(c, off) foreign "C" overwritingMutableClosureOfs(c "ptr", off</span>)</span></span>
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630
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630
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<td class="diff-line-num old_line" data-linenumber="631" 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">
631
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_SIZE(c, size) </span><span class="cm" style="color: #998; font-style: italic;">/* nothing */</span></span>
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632
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE(c) </span><span class="cm" style="color: #998; font-style: italic;">/* nothing */</span></span>
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633
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<pre style="margin: 0;">-<span id="LC633" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_<span class="idiff left right">OFS(c,n</span>) </span><span class="cm" style="color: #998; font-style: italic;">/* nothing */</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_<span class="idiff left right">MUTABLE(c, off</span>) </span><span class="cm" style="color: #998; font-style: italic;">/* nothing */</span></span>
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634
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Memory barriers.</span></span>
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<li id="40f83a2cddcbc1f8190b0551eb572ccf4ea88cc9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6947231abd8c33840860ad51699b76efd4725f0e...389920858e0b9efe5234cb7dac55d06e955768f7#40f83a2cddcbc1f8190b0551eb572ccf4ea88cc9"><strong>includes/Rts.h</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">@@ -184,6 +184,9 @@ void _assertFail(const char *filename, unsigned int linenum)</td>
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184
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184
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Global constraints */</span></span>
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185
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185
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/Constants.h"</span></span>
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186
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186
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="c"></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Runtime flags */</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/Flags.h"</span></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="c"></span>
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187
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190
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Profiling information */</span></span>
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188
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191
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/prof/CCS.h"</span></span>
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189
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192
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/prof/LDV.h"</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="214" 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="217" 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">@@ -214,7 +217,6 @@ void _assertFail(const char *filename, unsigned int linenum)</td>
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214
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217
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/Signals.h"</span></span>
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215
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218
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/BlockSignals.h"</span></span>
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216
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219
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/Hpc.h"</span></span>
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217
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<pre style="margin: 0;">-<span id="LC217" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/Flags.h"</span></span>
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218
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220
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/Adjustor.h"</span></span>
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219
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221
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/FileLock.h"</span></span>
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220
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222
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/GetTime.h"</span></span>
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<li id="aa19e824b3a8c24a7bf37f8352997022b14a5a0c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6947231abd8c33840860ad51699b76efd4725f0e...389920858e0b9efe5234cb7dac55d06e955768f7#aa19e824b3a8c24a7bf37f8352997022b14a5a0c"><strong>includes/rts/storage/ClosureMacros.h</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="510" 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">@@ -510,24 +510,16 @@ INLINE_HEADER StgWord8 *mutArrPtrsCard (StgMutArrPtrs *a, W_ n)</td>
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510
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510
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="c"></span>
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511
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511
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> -------------------------------------------------------------------------- */</span></span>
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512
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512
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="c"></span>
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513
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING)</span></span>
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514
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<pre style="margin: 0;">-<span id="LC514" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define ZERO_SLOP_FOR_LDV_PROF 1</span></span>
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513
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING) || defined(DEBUG)</span></span>
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514
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE(c) \</span></span>
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> overwritingClosure(c)</span></span>
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_MUTABLE(c, off) \</span></span>
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<pre style="margin: 0;">+<span id="LC517" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> overwritingMutableClosureOfs(c, off)</span></span>
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;">-<span id="LC516" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define ZERO_SLOP_FOR_LDV_PROF 0</span></span>
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<pre style="margin: 0;">-<span id="LC517" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;">-<span id="LC518" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC519" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(DEBUG) && !defined(THREADED_RTS)</span></span>
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<pre style="margin: 0;">-<span id="LC520" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define ZERO_SLOP_FOR_SANITY_CHECK 1</span></span>
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<pre style="margin: 0;">-<span id="LC521" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;">-<span id="LC522" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define ZERO_SLOP_FOR_SANITY_CHECK 0</span></span>
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<pre style="margin: 0;">-<span id="LC523" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;">-<span id="LC524" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC525" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if ZERO_SLOP_FOR_LDV_PROF || ZERO_SLOP_FOR_SANITY_CHECK</span></span>
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<pre style="margin: 0;">-<span id="LC526" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE(c) overwritingClosure(c)</span></span>
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<pre style="margin: 0;">-<span id="LC527" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_OFS(c,n) overwritingClosureOfs(c,n)</span></span>
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<pre style="margin: 0;">-<span id="LC528" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;">-<span id="LC529" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE(c) </span><span class="cm" style="color: #998; font-style: italic;">/* nothing */</span></span>
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<pre style="margin: 0;">-<span id="LC530" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_OFS(c,n) </span><span class="cm" style="color: #998; font-style: italic;">/* nothing */</span></span>
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE(c) \</span></span>
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> do { (void) sizeof(c); } while(0)</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_MUTABLE(c, off) \</span></span>
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> do { (void) sizeof(c); (void) sizeof(off); } while(0)</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC524" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING)</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">@@ -535,22 +527,57 @@ void LDV_recordDead (const StgClosure *c, uint32_t size);</td>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="c"><span class="n" style="color: #333;">RTS_PRIVATE</span> <span class="n" style="color: #333;">bool</span> <span class="nf" style="color: #900; font-weight: 600;">isInherentlyUsed</span> <span class="p">(</span> <span class="n" style="color: #333;">StgHalfWord</span> <span class="n" style="color: #333;">closure_type</span> <span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="c"><span class="n" style="color: #333;">EXTERN_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">overwritingClosure_</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">offset</span> <span class="cm" style="color: #998; font-style: italic;">/* in words */</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC540" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">size</span> <span class="cm" style="color: #998; font-style: italic;">/* closure size, in words */</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC541" class="line" lang="c"> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">inherently_used</span> <span class="n" style="color: #333;">USED_IF_PROFILING</span></span>
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<pre style="margin: 0;">-<span id="LC542" class="line" lang="c"> <span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="c"><span class="n" style="color: #333;">EXTERN_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">overwritingClosure_</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">offset</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">size</span><span class="p">,</span> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">inherently_used</span> <span class="n" style="color: #333;">USED_IF_PROFILING</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="c"><span class="n" style="color: #333;">EXTERN_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">zeroSlop</span> <span class="p">(</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="c"> <span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">offset</span><span class="p">,</span> <span class="cm" style="color: #998; font-style: italic;">/*< offset to start zeroing at, in words */</span></span>
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">size</span><span class="p">,</span> <span class="cm" style="color: #998; font-style: italic;">/*< total closure size, in words */</span></span>
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="c"> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">known_mutable</span> <span class="cm" style="color: #998; font-style: italic;">/*< is this a closure who's slop we can always zero? */</span></span>
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="c"> <span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="c"><span class="n" style="color: #333;">EXTERN_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">zeroSlop</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">offset</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">size</span><span class="p">,</span> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">known_mutable</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC540" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC545" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if ZERO_SLOP_FOR_LDV_PROF && !ZERO_SLOP_FOR_SANITY_CHECK</span></span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// see Note [zeroing slop when overwriting closures], also #8402</span></span>
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<pre style="margin: 0;">-<span id="LC547" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">era</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="k" style="font-weight: 600;">return</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">want_to_zero_immutable_slop</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">false</span></span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Sanity checking (-DS) is enabled</span></span>
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="c"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">RTS_DEREF</span><span class="p">(</span><span class="n" style="color: #333;">RtsFlags</span><span class="p">).</span><span class="n" style="color: #333;">DebugFlags</span><span class="p">.</span><span class="n" style="color: #333;">sanity</span></span>
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING)</span></span>
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<pre style="margin: 0;">+<span id="LC547" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// LDV profiler is enabled</span></span>
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="c"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">era</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;"> <span id="LC549" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="c"> <span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC552" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">can_zero_immutable_slop</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Only if we're running single threaded.</span></span>
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<pre style="margin: 0;">+<span id="LC554" class="line" lang="c"> <span class="n" style="color: #333;">RTS_DEREF</span><span class="p">(</span><span class="n" style="color: #333;">RtsFlags</span><span class="p">).</span><span class="n" style="color: #333;">ParFlags</span><span class="p">.</span><span class="n" style="color: #333;">nCapabilities</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">1</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">zero_slop_immutable</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="c"> <span class="n" style="color: #333;">want_to_zero_immutable_slop</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">can_zero_immutable_slop</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC558" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC550" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">// For LDV profiling, we need to record the closure as dead</span></span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="c"> <span class="k" style="font-weight: 600;"><span class="idiff left">const</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bool</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">zero_slop_mutable</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">=</span></span></span>
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560
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<pre style="margin: 0;"> <span id="LC560" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING)</span></span>
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552
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<pre style="margin: 0;">-<span id="LC552" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">inherently_used</span><span class="p">)</span> <span class="p">{</span> <span class="n" style="color: #333;">LDV_recordDead</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">size</span><span class="p">);</span> <span class="p">};</span></span>
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561
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Always zero mutable closure slop when profiling. We do this to cover</span></span>
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562
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// the case of shrinking mutable arrays in pinned blocks for the heap</span></span>
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563
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// profiler, see Note [skipping slop in the heap profiler]</span></span>
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564
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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565
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// TODO: We could make this check more specific and only zero if the</span></span>
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566
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// object is in a BF_PINNED bdescr here. Update Note [slop on the heap]</span></span>
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567
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// and [zeroing slop when overwriting closures] if you change this.</span></span>
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568
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="c"> <span class="nb" style="color: #0086b3;">true</span></span>
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569
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="c"> <span class="n" style="color: #333;">zero_slop_immutable</span></span>
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571
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;">+<span id="LC572" class="line" lang="c"> <span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="c"></span>
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574
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<pre style="margin: 0;">+<span id="LC574" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">zero_slop</span> <span class="o" style="font-weight: 600;">=</span></span>
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575
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<pre style="margin: 0;">+<span id="LC575" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// If we're not sure this is a mutable closure treat it like an</span></span>
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576
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// immutable one.</span></span>
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577
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="c"> <span class="n" style="color: #333;">known_mutable</span> <span class="o" style="font-weight: 600;">?</span> <span class="n" style="color: #333;">zero_slop_mutable</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">zero_slop_immutable</span><span class="p">;</span></span>
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578
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="c"></span>
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579
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span><span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">zero_slop</span><span class="p">)</span></span>
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580
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span><span class="p">;</span></span>
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554
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581
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="c"></span>
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582
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">offset</span><span class="p">;</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">size</span><span class="p">;</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="c"> <span class="p">((</span><span class="n" style="color: #333;">StgWord</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">p</span><span class="p">)[</span><span class="n" style="color: #333;">i</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</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">@@ -560,22 +587,23 @@ EXTERN_INLINE void overwritingClosure_ (StgClosure *p, uint32_t offset, uint32_t</td>
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560
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<pre style="margin: 0;"> <span id="LC587" class="line" lang="c"><span class="n" style="color: #333;">EXTERN_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">overwritingClosure</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">);</span></span>
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561
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<pre style="margin: 0;"> <span id="LC588" class="line" lang="c"><span class="n" style="color: #333;">EXTERN_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">overwritingClosure</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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562
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589
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="c"><span class="p">{</span></span>
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590
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="c"> <span class="n" style="color: #333;">W_</span> <span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">closure_sizeW</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">);</span></span>
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563
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591
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<pre style="margin: 0;"> <span id="LC591" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING)</span></span>
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564
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<pre style="margin: 0;">-<span id="LC564" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">isInherentlyUsed</span><span class="p">(</span><span class="n" style="color: #333;">get_itbl</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">type</span><span class="p">));</span></span>
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592
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span><span class="p">(</span><span class="n" style="color: #333;">era</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="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">isInherentlyUsed</span><span class="p">(</span><span class="n" style="color: #333;">get_itbl</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">type</span><span class="p">))</span></span>
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593
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="c"> <span class="n" style="color: #333;">LDV_recordDead</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">size</span><span class="p">);</span></span>
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565
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<pre style="margin: 0;"> <span id="LC594" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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566
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<pre style="margin: 0;">-<span id="LC566" class="line" lang="c"> <span class="n" style="color: #333;">overwritingClosure_</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">sizeofW</span><span class="p">(</span><span class="n" style="color: #333;">StgThunkHeader</span><span class="p">),</span> <span class="n" style="color: #333;">closure_sizeW</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">),</span></span>
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567
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<pre style="margin: 0;">-<span id="LC567" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/*inherently_used=*/</span><span class="nb" style="color: #0086b3;">false</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="c"> <span class="n" style="color: #333;">zeroSlop</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">sizeofW</span><span class="p">(</span><span class="n" style="color: #333;">StgThunkHeader</span><span class="p">),</span> <span class="n" style="color: #333;">size</span><span class="p">,</span> <span class="cm" style="color: #998; font-style: italic;">/*known_mutable=*/</span><span class="nb" style="color: #0086b3;">false</span><span class="p">);</span></span>
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568
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596
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<pre style="margin: 0;"> <span id="LC596" class="line" lang="c"><span class="p">}</span></span>
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597
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="c"></span>
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598
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<pre style="margin: 0;"> <span id="LC598" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Version of 'overwritingClosure' which overwrites only a suffix of a</span></span>
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571
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599
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// closure. The offset is expressed in words relative to 'p' and shall</span></span>
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600
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// be less than or equal to closure_sizeW(p), and usually at least as</span></span>
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573
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// large as the respective thunk header.</span></span>
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<pre style="margin: 0;">-<span id="LC574" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">//</span></span></span>
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<pre style="margin: 0;">-<span id="LC575" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">// Note: As this calls LDV_recordDead() you have to call LDV_RECORD_CREATE()</span></span></span>
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<pre style="margin: 0;">-<span id="LC576" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">// on the final state of the closure at the call-site</span></span></span>
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="c"><span class="n" style="color: #333;">EXTERN_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">overwritingClosureOfs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">StgClosure</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="n" style="color: #333;"><span class="idiff">p</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">uint32_t</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">offset</span></span><span class="p"><span class="idiff right">);</span></span></span>
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="c"><span class="n" style="color: #333;"><span class="idiff left">EXTERN_INLINE</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">void</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">overwriting</span>ClosureOfs</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">offset</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC602" class="line" lang="c"><span class="n" style="color: #333;"><span class="idiff left">EXTERN_INLINE</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">void</span></span></span>
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">overwritingMutableClosureOfs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">StgClosure</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="n" style="color: #333;"><span class="idiff">p</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">uint32_t</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">offset</span></span><span class="p"><span class="idiff right">);</span></span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="c"><span class="n" style="color: #333;">EXTERN_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">overwritingMutable</span>ClosureOfs</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">offset</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Since overwritingClosureOfs is only ever called by:</span></span>
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</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">@@ -583,18 +611,24 @@ EXTERN_INLINE void overwritingClosureOfs (StgClosure *p, uint32_t offset)</td>
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// - shrinkSmallMutableArray# (SMALL_MUT_ARR_PTRS)</span></span>
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585
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<pre style="margin: 0;"> <span id="LC613" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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<pre style="margin: 0;">-<span id="LC586" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// we can safely set inherently_used = true, which means LDV_recordDead</span></span>
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<pre style="margin: 0;">-<span id="LC587" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// won't be invoked below. Since these closures are inherenlty used we don't</span></span>
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<pre style="margin: 0;">-<span id="LC588" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// need to track their destruction.</span></span>
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<pre style="margin: 0;">-<span id="LC589" class="line" lang="c"> <span class="n" style="color: #333;">overwritingClosure_</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">offset</span><span class="p">,</span> <span class="n" style="color: #333;">closure_sizeW</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">),</span> <span class="cm" style="color: #998; font-style: italic;">/*inherently_used=*/</span><span class="nb" style="color: #0086b3;">true</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// we can safely omit the Ldv_recordDead call. Since these closures are</span></span>
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// considered inherenlty used we don't need to track their destruction.</span></span>
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616
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<pre style="margin: 0;">+<span id="LC616" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING)</span></span>
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617
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">isInherentlyUsed</span><span class="p">(</span><span class="n" style="color: #333;">get_itbl</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">type</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">true</span><span class="p">);</span></span>
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618
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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619
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<pre style="margin: 0;">+<span id="LC619" class="line" lang="c"> <span class="n" style="color: #333;">zeroSlop</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">offset</span><span class="p">,</span> <span class="n" style="color: #333;">closure_sizeW</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">),</span> <span class="cm" style="color: #998; font-style: italic;">/*known_mutable=*/</span><span class="nb" style="color: #0086b3;">true</span><span class="p">);</span></span>
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620
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="c"><span class="p">}</span></span>
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591
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="c"></span>
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592
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<pre style="margin: 0;"> <span id="LC622" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Version of 'overwritingClosure' which takes closure size as argument.</span></span>
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593
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="c"><span class="n" style="color: #333;">EXTERN_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">overwritingClosureSize</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">size</span> <span class="cm" style="color: #998; font-style: italic;">/* in words */</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC624" class="line" lang="c"><span class="n" style="color: #333;">EXTERN_INLINE</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">overwritingClosureSize</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">size</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// This function is only called from stg_AP_STACK so we can assume it's not</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// inherently used.</span></span>
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596
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING)</span></span>
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597
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<pre style="margin: 0;">-<span id="LC597" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">isInherentlyUsed</span><span class="p">(</span><span class="n" style="color: #333;">get_itbl</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">type</span><span class="p">));</span></span>
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629
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">isInherentlyUsed</span><span class="p">(</span><span class="n" style="color: #333;">get_itbl</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">type</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">false</span><span class="p">);</span></span>
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630
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span><span class="p">(</span><span class="n" style="color: #333;">era</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span><span class="p">)</span></span>
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631
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<pre style="margin: 0;">+<span id="LC631" class="line" lang="c"> <span class="n" style="color: #333;">LDV_recordDead</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">size</span><span class="p">);</span></span>
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598
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632
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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599
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<pre style="margin: 0;">-<span id="LC599" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">overwritingClosure_</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">p</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sizeofW</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">StgThunkHeader</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">size</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="cm" style="color: #998; font-style: italic;"><span class="idiff right">/*inherently_used</span>=*/</span><span class="nb" style="color: #0086b3;">false</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">zeroSlop</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">p</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sizeofW</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">StgThunkHeader</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">size</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="cm" style="color: #998; font-style: italic;"><span class="idiff right">/*known_mutable</span>=*/</span><span class="nb" style="color: #0086b3;">false</span><span class="p">);</span></span>
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600
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="c"><span class="p">}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6947231abd8c33840860ad51699b76efd4725f0e...389920858e0b9efe5234cb7dac55d06e955768f7#6db965f97cbab901f493506a385bcf1283009921"><strong>rts/PrimOps.cmm</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">@@ -175,8 +175,8 @@ stg_shrinkMutableByteArrayzh ( gcptr mba, W_ new_size )</td>
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175
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="plaintext">{</span>
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176
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176
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="plaintext"> ASSERT(new_size <= StgArrBytes_bytes(mba));</span>
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177
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177
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="plaintext"></span>
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178
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="plaintext"> OVERWRITING_CLOSURE_<span class="idiff left right">OFS</span>(mba, (BYTES_TO_WDS(SIZEOF_StgArrBytes) +</span>
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179
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="plaintext"> ROUNDUP_BYTES_TO_WDS(new_size)));</span>
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="plaintext"> OVERWRITING_CLOSURE_<span class="idiff left right">MUTABLE</span>(mba, (BYTES_TO_WDS(SIZEOF_StgArrBytes) +</span>
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="plaintext"> <span class="idiff left right"> </span>ROUNDUP_BYTES_TO_WDS(new_size)));</span>
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180
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="plaintext"> StgArrBytes_bytes(mba) = new_size;</span>
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181
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="plaintext"> // No need to call LDV_RECORD_CREATE. See Note [LDV profiling and resizing arrays]</span>
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182
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182
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="plaintext"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="199" 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">@@ -199,8 +199,8 @@ stg_resizzeMutableByteArrayzh ( gcptr mba, W_ new_size )</td>
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199
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="plaintext"> new_size_wds = ROUNDUP_BYTES_TO_WDS(new_size);</span>
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200
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200
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="plaintext"></span>
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201
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="plaintext"> if (new_size_wds <= BYTE_ARR_WDS(mba)) {</span>
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="plaintext"> OVERWRITING_CLOSURE_<span class="idiff left right">OFS</span>(mba, (BYTES_TO_WDS(SIZEOF_StgArrBytes) +</span>
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203
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="plaintext"> new_size_wds));</span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="plaintext"> OVERWRITING_CLOSURE_<span class="idiff left right">MUTABLE</span>(mba, (BYTES_TO_WDS(SIZEOF_StgArrBytes) +</span>
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="plaintext"> <span class="idiff left right"> </span>new_size_wds));</span>
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204
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="plaintext"> StgArrBytes_bytes(mba) = new_size;</span>
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205
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="plaintext"> // No need to call LDV_RECORD_CREATE. See Note [LDV profiling and resizing arrays]</span>
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206
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206
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="plaintext"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="228" 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">@@ -228,8 +228,8 @@ stg_shrinkSmallMutableArrayzh ( gcptr mba, W_ new_size )</td>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="plaintext">{</span>
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<pre style="margin: 0;"> <span id="LC229" class="line" lang="plaintext"> ASSERT(new_size <= StgSmallMutArrPtrs_ptrs(mba));</span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC231" class="line" lang="plaintext"> OVERWRITING_CLOSURE_<span class="idiff left right">OFS</span>(mba, (BYTES_TO_WDS(SIZEOF_StgSmallMutArrPtrs) +</span>
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<pre style="margin: 0;">-<span id="LC232" class="line" lang="plaintext"> new_size));</span>
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="plaintext"> OVERWRITING_CLOSURE_<span class="idiff left right">MUTABLE</span>(mba, (BYTES_TO_WDS(SIZEOF_StgSmallMutArrPtrs) +</span>
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="plaintext"> <span class="idiff left right"> </span>new_size));</span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="plaintext"> StgSmallMutArrPtrs_ptrs(mba) = new_size;</span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="plaintext"> // No need to call LDV_RECORD_CREATE. See Note [LDV profiling and resizing arrays]</span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6947231abd8c33840860ad51699b76efd4725f0e...389920858e0b9efe5234cb7dac55d06e955768f7#0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273"><strong>rts/sm/Storage.c</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">@@ -948,7 +948,7 @@ accountAllocation(Capability *cap, W_ n)</td>
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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949
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * When profiling we zero:</span></span>
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Pinned object alignment slop, see MEMSET_IF_PROFILING_W in allocatePinned.</span></span>
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<pre style="margin: 0;">-<span id="LC951" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Shrunk array slop, see OVERWRITING_<span class="idiff left right">MUTABLE_CLOSUR</span>E.</span></span>
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<pre style="margin: 0;">+<span id="LC951" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Shrunk array slop, see OVERWRITING_<span class="idiff left right">CLOSURE_MUTABL</span>E.</span></span>
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<pre style="margin: 0;"> <span id="LC952" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;"> <span id="LC953" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * When performing LDV profiling or using a (single threaded) debug RTS we zero</span></span>
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<pre style="margin: 0;"> <span id="LC954" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * slop even when overwriting immutable closures, see Note [zeroing slop when</span></span>
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