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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - AArch64 MachineOutliner causes performance regression on Firefox"
href="https://bugs.llvm.org/show_bug.cgi?id=39717">39717</a>
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<th>Summary</th>
<td>AArch64 MachineOutliner causes performance regression on Firefox
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>mh+llvm@glandium.org
</td>
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<th>CC</th>
<td>htmldeveloper@gmail.com, jpaquette@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Upgrading from Clang 6 to Clang 7 made Firefox for Android performance
regression on aarch64, noticeable as a ~2.5% regression on the speedometer
benchmark.
After bisection, I found that the cause of the regression is
<a href="https://github.com/llvm-mirror/llvm/commit/031332e78887f4658e2d7a2f7541827c2ca9baf5">https://github.com/llvm-mirror/llvm/commit/031332e78887f4658e2d7a2f7541827c2ca9baf5</a>,
and building with clang 7 with that patch reverted does bring the speedometer
score to what it was with clang 6.</pre>
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</p>
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