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<h3>
Ben Gamari pushed to branch wip/T7275
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/396c6e8ac654bb80b75272315525b93b8cb24722">396c6e8a</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-12-10T09:16:19-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Storage: Unconditionally enable zeroing of alignment slop
This is necessary since the user may enable `+RTS -hT` at any time.
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf80bf51fab0be63afa189b09592b7ae2f0c94ad">cf80bf51</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-12-10T09:34:31-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Zero shrunk array slop in vanilla RTS
But only when profiling or DEBUG are enabled.
Fixes #17572 and #9666.
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<h4>3 changed files:</h4>
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<a href="#6011cad13b19136953f8ee72df01a66623c5c1b0">
includes/Cmm.h
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<a href="#0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273">
rts/sm/Storage.c
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<a href="#b1e674fd735b5ce381ed44eead08cc27332cbdc3">
utils/deriveConstants/Main.hs
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<h4>Changes:</h4>
<li id="6011cad13b19136953f8ee72df01a66623c5c1b0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cf0568657b1cf256876ae58a6306d5d5b31905d3...cf80bf51fab0be63afa189b09592b7ae2f0c94ad#6011cad13b19136953f8ee72df01a66623c5c1b0"><strong>includes/Cmm.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">@@ -630,7 +630,11 @@</td>
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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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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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<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_MUTABLE(c, off) </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="cm" style="color: #998; font-style: italic;">/* This is used to zero slop after shrunk arrays. It is important that we do</span></span>
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * this whenever profiling is enabled as described in Note [slop on the heap]</span></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * in Storage.c. */</span></span>
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<pre style="margin: 0;">+<span id="LC636" 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="LC637" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> if (RtsFlags_ProfFlags_doHeapProfile != 0) { foreign "C" overwritingMutableClosureOfs(c "ptr", off) }</span></span>
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<pre style="margin: 0;"> <span id="LC638" 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="LC639" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Memory barriers.</span></span>
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<li id="0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cf0568657b1cf256876ae58a6306d5d5b31905d3...cf80bf51fab0be63afa189b09592b7ae2f0c94ad#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">@@ -952,10 +952,20 @@ accountAllocation(Capability *cap, W_ n)</td>
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<pre style="margin: 0;"> <span id="LC952" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * of closures. This trick is used by the sanity checking code and the heap</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;"> * profiler, see Note [skipping slop in the heap profiler].</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;"> *</span></span>
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<pre style="margin: 0;">-<span id="LC955" 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="LC956" 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="LC955" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * In general we zero:</span></span>
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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957
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Pinned object alignment slop, see MEMSET_SLOP_W in allocatePinned.</span></span>
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958
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Large object alignment slop, see MEMSET_SLOP_W in allocatePinned.</span></span>
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957
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959
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Shrunk array slop, see OVERWRITING_CLOSURE_MUTABLE.</span></span>
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958
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960
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<pre style="margin: 0;"> <span id="LC960" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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961
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Note that this is necessary even in the vanilla (e.g. non-profiling) RTS</span></span>
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962
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * since the user may trigger a heap census via +RTS -hT, which can be used</span></span>
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963
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * even when not linking against the profiled RTS. Failing to zero slop</span></span>
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964
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * due to array shrinking has resulted in a few nasty bugs (#17572, #9666).</span></span>
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965
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * However, since array shrink may result in large amounts of slop (unlike</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * alignment), we take care to only zero such slop when heap profiling or DEBUG</span></span>
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967
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * are enabled.</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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959
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969
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<pre style="margin: 0;"> <span id="LC969" 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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960
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970
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<pre style="margin: 0;"> <span id="LC970" 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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961
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971
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * overwriting closures].</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">@@ -1126,12 +1136,7 @@ allocateMightFail (Capability *cap, W_ n)</td>
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1126
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1136
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<pre style="margin: 0;"> <span id="LC1136" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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1127
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1137
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<pre style="margin: 0;"> <span id="LC1137" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * See Note [skipping slop in the heap profiler]</span></span>
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1128
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1138
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<pre style="margin: 0;"> <span id="LC1138" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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1129
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<pre style="margin: 0;">-<span id="LC1129" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING)</span></span>
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1130
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<pre style="margin: 0;">-<span id="LC1130" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define MEMSET_IF_PROFILING_W(p, val, len_w) memset(p, val, (len_w) * sizeof(W_))</span></span>
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1131
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<pre style="margin: 0;">-<span id="LC1131" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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1132
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<pre style="margin: 0;">-<span id="LC1132" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define MEMSET_IF_PROFILING_W(p, val, len_w) \</span></span>
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1133
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<pre style="margin: 0;">-<span id="LC1133" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> do { (void)(p); (void)(val); (void)(len_w); } while(0)</span></span>
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1134
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<pre style="margin: 0;">-<span id="LC1134" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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1139
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<pre style="margin: 0;">+<span id="LC1139" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define MEMSET_SLOP_W(p, val, len_w) memset(p, val, (len_w) * sizeof(W_))</span></span>
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1135
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1140
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<pre style="margin: 0;"> <span id="LC1140" class="line" lang="c"></span>
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1136
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1141
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<pre style="margin: 0;"> <span id="LC1141" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* ---------------------------------------------------------------------------</span></span>
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1137
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1142
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<pre style="margin: 0;"> <span id="LC1142" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> Allocate a fixed/pinned object.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1184" 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="1189" 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">@@ -1184,9 +1189,9 @@ allocatePinned (Capability *cap, W_ n /*words*/, W_ alignment /*bytes*/, W_ alig</td>
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1184
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1189
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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1185
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="c"> <span class="n" style="color: #333;">Bdescr</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;">flags</span> <span class="o" style="font-weight: 600;">|=</span> <span class="n" style="color: #333;">BF_PINNED</span><span class="p">;</span></span>
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1186
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1191
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<pre style="margin: 0;"> <span id="LC1191" class="line" lang="c"> <span class="n" style="color: #333;">W_</span> <span class="n" style="color: #333;">off_w</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ALIGN_WITH_OFF_W</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">alignment</span><span class="p">,</span> <span class="n" style="color: #333;">align_off</span><span class="p">);</span></span>
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1187
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<pre style="margin: 0;">-<span id="LC1187" class="line" lang="c"> <span class="n" style="color: #333;">MEMSET_<span class="idiff left right">IF_PROFILING_W</span></span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">off_w</span><span class="p">);</span></span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="c"> <span class="n" style="color: #333;">MEMSET_<span class="idiff left right">SLOP</span></span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">off_w</span><span class="p">);</span></span>
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1188
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1193
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<pre style="margin: 0;"> <span id="LC1193" class="line" lang="c"> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">off_w</span><span class="p">;</span></span>
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1189
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<pre style="margin: 0;">-<span id="LC1189" class="line" lang="c"> <span class="n" style="color: #333;">MEMSET_<span class="idiff left">IF_PROFILING_W</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">p</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">+</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">0</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alignment_w</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">off_w</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff right">1</span></span><span class="p">);</span></span>
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1194
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<pre style="margin: 0;">+<span id="LC1194" class="line" lang="c"> <span class="n" style="color: #333;">MEMSET_<span class="idiff left">SLOP</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">p</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">+</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">0</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">alignment_w</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">off_w</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff right">)</span>);</span></span>
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1190
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1195
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<pre style="margin: 0;"> <span id="LC1195" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">p</span><span class="p">;</span></span>
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1191
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1196
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<pre style="margin: 0;"> <span id="LC1196" class="line" lang="c"> <span class="p">}</span></span>
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1192
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1197
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<pre style="margin: 0;"> <span id="LC1197" class="line" lang="c"> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1258" 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="1263" 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">@@ -1258,7 +1263,7 @@ allocatePinned (Capability *cap, W_ n /*words*/, W_ alignment /*bytes*/, W_ alig</td>
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1258
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1263
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<pre style="margin: 0;"> <span id="LC1263" class="line" lang="c"></span>
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1259
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1264
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<pre style="margin: 0;"> <span id="LC1264" class="line" lang="c"> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bd</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">free</span><span class="p">;</span></span>
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1260
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1265
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<pre style="margin: 0;"> <span id="LC1265" class="line" lang="c"></span>
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1261
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<pre style="margin: 0;">-<span id="LC1261" class="line" lang="c"> <span class="n" style="color: #333;">MEMSET_<span class="idiff left right">IF_PROFILING_W</span></span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">off_w</span><span class="p">);</span></span>
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1266
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<pre style="margin: 0;">+<span id="LC1266" class="line" lang="c"> <span class="n" style="color: #333;">MEMSET_<span class="idiff left right">SLOP</span></span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">off_w</span><span class="p">);</span></span>
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1262
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1267
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<pre style="margin: 0;"> <span id="LC1267" class="line" lang="c"></span>
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1263
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1268
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<pre style="margin: 0;"> <span id="LC1268" class="line" lang="c"> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">off_w</span><span class="p">;</span></span>
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1264
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1269
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<pre style="margin: 0;"> <span id="LC1269" class="line" lang="c"> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">off_w</span><span class="p">;</span></span>
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<li id="b1e674fd735b5ce381ed44eead08cc27332cbdc3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cf0568657b1cf256876ae58a6306d5d5b31905d3...cf80bf51fab0be63afa189b09592b7ae2f0c94ad#b1e674fd735b5ce381ed44eead08cc27332cbdc3"><strong>utils/deriveConstants/Main.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">@@ -561,6 +561,8 @@ wanteds os = concat</td>
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561
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561
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">structField</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="s" style="color: #d14;">"StgCompactNFDataBlock"</span> <span class="s" style="color: #d14;">"owner"</span></span>
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562
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562
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">structField</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="s" style="color: #d14;">"StgCompactNFDataBlock"</span> <span class="s" style="color: #d14;">"next"</span></span>
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563
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563
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"></span>
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564
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">structField_</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="s" style="color: #d14;">"RtsFlags_ProfFlags_doHeapProfile"</span></span>
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565
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"> <span class="s" style="color: #d14;">"RTS_FLAGS"</span> <span class="s" style="color: #d14;">"ProfFlags.doHeapProfile"</span></span>
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564
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566
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">structField_</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="s" style="color: #d14;">"RtsFlags_ProfFlags_showCCSOnException"</span></span>
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565
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567
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="s" style="color: #d14;">"RTS_FLAGS"</span> <span class="s" style="color: #d14;">"ProfFlags.showCCSOnException"</span></span>
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566
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568
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">structField_</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="s" style="color: #d14;">"RtsFlags_DebugFlags_apply"</span></span>
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