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<h3>
Ben Gamari pushed to branch wip/gc/aligned-block-allocation
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/f3191083052fb4a03c593aa745e9d9610bb8a8ce">f3191083</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-19T00:32:01Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disallow allocating megablocks, update tests
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/67cbec4afac497f34c9e8f89af6ffe5ecaf28cc2">67cbec4a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-19T00:32:01Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix lint errors
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/59d32a9973a3170e2269acc4077fc5516797e044">59d32a99</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-19T00:32:01Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use allocLargeChunkOnNode to reduce splitting
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/ead67e400308d2ee48f20dd99e33ea03d906e3b2">ead67e40</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-06-19T00:32:01Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow allocating megablocks in allocAlignedGroupOnNode
This is currently broken because freeGroup assumes integral number of
megablocks when freeing megablocks but we try to split the megablocks
returned by allocLargeChunkOnNode to smaller groups and free the rest.
</pre>
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<h4>2 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#a9accda65187a56e0d42dd7fb7a717af6b41d918">
rts/sm/BlockAlloc.c
</a>
</li>
<li class="file-stats">
<a href="#6f2f059ef5196eb663d81eff3bd13e3b47181338">
testsuite/tests/rts/testblockalloc.c
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="a9accda65187a56e0d42dd7fb7a717af6b41d918">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/d2577711ce077d6887f0b7046e863148da270643...ead67e400308d2ee48f20dd99e33ea03d906e3b2#a9accda65187a56e0d42dd7fb7a717af6b41d918"><strong>rts/sm/BlockAlloc.c</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="511" 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">@@ -511,10 +511,11 @@ allocAlignedGroupOnNode (uint32_t node, W_ n)</td>
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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="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">num_blocks</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">2</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">n</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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512
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512
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="c"> <span class="n" style="color: #333;">W_</span> <span class="n" style="color: #333;">group_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">BLOCK_SIZE</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC514" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// It's okay if we get a group larger than what we request; we will end up</span></span>
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515
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<pre style="margin: 0;">-<span id="LC515" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// splitting it anyways. By using allocLargeChunk we reduce the potential</span></span>
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<pre style="margin: 0;">-<span id="LC516" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// for fragmentation.</span></span>
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517
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<pre style="margin: 0;">-<span id="LC517" class="line" lang="c"> <span class="n" style="color: #333;">bdescr</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;">allocLargeChunkOnNode</span><span class="p">(</span><span class="n" style="color: #333;">node</span><span class="p">,</span> <span class="n" style="color: #333;">num_blocks</span><span class="p">,</span> <span class="mi" style="color: #099;">3</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">n</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// To reduce splitting and fragmentation we use allocLargeChunkOnNode here.</span></span>
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="c"> <span class="n" style="color: #333;">bdescr</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;">allocLargeChunkOnNode</span><span class="p">(</span><span class="n" style="color: #333;">node</span><span class="p">,</span> <span class="n" style="color: #333;">num_blocks</span><span class="p">,</span> <span class="n" style="color: #333;">num_blocks</span><span class="o" style="font-weight: 600;">*</span><span class="mi" style="color: #099;">3</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC517" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// We may allocate more than num_blocks, so update it</span></span>
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="c"> <span class="n" style="color: #333;">num_blocks</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;">blocks</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// slop on the low side</span></span>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="c"> <span class="n" style="color: #333;">W_</span> <span class="n" style="color: #333;">slop_low</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">@@ -532,7 +533,7 @@ allocAlignedGroupOnNode (uint32_t node, W_ n)</td>
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533
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<pre style="margin: 0;"> <span id="LC533" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">slop_low_blocks</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">slop_high_blocks</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">num_blocks</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC535" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if<span class="idiff left right">def DEBUG</span></span></span>
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if<span class="idiff left right"> defined(DEBUG)</span></span></span>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="c"> <span class="n" style="color: #333;">checkFreeListSanity</span><span class="p">();</span></span>
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="c"> <span class="n" style="color: #333;">W_</span> <span class="n" style="color: #333;">free_before</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">countFreeList</span><span class="p">();</span></span>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</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">@@ -542,7 +543,7 @@ allocAlignedGroupOnNode (uint32_t node, W_ n)</td>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">countBlocks</span><span class="p">(</span><span class="n" style="color: #333;">bd</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">num_blocks</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">slop_low_blocks</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC544" 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>
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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<span class="idiff left right">def DEBUG</span></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<span class="idiff left right"> defined(DEBUG)</span></span></span>
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">countFreeList</span><span class="p">()</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">free_before</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">slop_low_blocks</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="c"> <span class="n" style="color: #333;">checkFreeListSanity</span><span class="p">();</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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -550,7 +551,7 @@ allocAlignedGroupOnNode (uint32_t node, W_ n)</td>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// At this point the bd should be aligned, but we may have slop on the high side</span></span>
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">uintptr_t</span><span class="p">)</span><span class="n" style="color: #333;">bd</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">start</span> <span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">group_size</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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<pre style="margin: 0;"> <span id="LC553" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC553" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if<span class="idiff left right">def DEBUG</span></span></span>
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<pre style="margin: 0;">+<span id="LC554" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if<span class="idiff left right"> defined(DEBUG)</span></span></span>
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<pre style="margin: 0;"> <span id="LC555" class="line" lang="c"> <span class="n" style="color: #333;">free_before</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">countFreeList</span><span class="p">();</span></span>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</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">@@ -559,7 +560,7 @@ allocAlignedGroupOnNode (uint32_t node, W_ n)</td>
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<pre style="margin: 0;"> <span id="LC560" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">bd</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">blocks</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">n</span><span class="p">);</span></span>
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560
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561
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="c"> <span class="p">}</span></span>
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562
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC562" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if<span class="idiff left right">def DEBUG</span></span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if<span class="idiff left right"> defined(DEBUG)</span></span></span>
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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="n" style="color: #333;">countFreeList</span><span class="p">()</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">free_before</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">slop_high_blocks</span><span class="p">);</span></span>
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564
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565
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="c"> <span class="n" style="color: #333;">checkFreeListSanity</span><span class="p">();</span></span>
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565
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<li id="6f2f059ef5196eb663d81eff3bd13e3b47181338">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/d2577711ce077d6887f0b7046e863148da270643...ead67e400308d2ee48f20dd99e33ea03d906e3b2#6f2f059ef5196eb663d81eff3bd13e3b47181338"><strong>testsuite/tests/rts/testblockalloc.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">@@ -80,8 +80,9 @@ static void test_aligned_alloc(void)</td>
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<pre style="margin: 0;"> <span id="LC80" 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;">int</span> <span class="n" style="color: #333;">j</span><span class="o" style="font-weight: 600;">=</span><span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">j</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">ARRSIZE</span><span class="p">;</span> <span class="n" style="color: #333;">j</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="c"> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">rand</span><span class="p">()</span> <span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">MAXALLOC</span><span class="p">)</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="LC83" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span><span class="p">;</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="c"> <span class="n" style="color: #333;">a</span><span class="p">[</span><span class="n" style="color: #333;">j</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">allocAlignedGroupOnNode</span><span class="p">(</span><span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC84" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">uintptr_t</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">j</span></span><span class="p"><span class="idiff">]</span></span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="n" style="color: #333;"><span class="idiff">start</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 right">b</span></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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<pre style="margin: 0;">+<span id="LC85" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">((<span class="idiff left">((</span></span><span class="n" style="color: #333;"><span class="idiff">W_</span></span><span class="p"><span class="idiff">)(</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">j</span></span><span class="p"><span class="idiff">]</span></span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="n" style="color: #333;"><span class="idiff">start</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><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">b</span></span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="n" style="color: #333;"><span class="idiff">BLOCK_SIZE</span></span><span class="p"><span class="idiff right">))</span></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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<pre style="margin: 0;"> <span id="LC86" class="line" lang="c"> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"%p is not aligned to allocation size %d"</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">[</span><span class="n" style="color: #333;">j</span><span class="p">],</span> <span class="n" style="color: #333;">b</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="c"> <span class="p">}</span></span>
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