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<body><span class="vcard"><a class="email" href="mailto:spatel+llvm@rotateright.com" title="Sanjay Patel <spatel+llvm@rotateright.com>"> <span class="fn">Sanjay Patel</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - h264 (SPEC) : 8% percent perf regression with -march=haswell compared to plain -O3"
href="https://bugs.llvm.org/show_bug.cgi?id=43578">bug 43578</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Fixed By Commit(s)</td>
<td>
</td>
<td>r374183
</td>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - h264 (SPEC) : 8% percent perf regression with -march=haswell compared to plain -O3"
href="https://bugs.llvm.org/show_bug.cgi?id=43578#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - h264 (SPEC) : 8% percent perf regression with -march=haswell compared to plain -O3"
href="https://bugs.llvm.org/show_bug.cgi?id=43578">bug 43578</a>
from <span class="vcard"><a class="email" href="mailto:spatel+llvm@rotateright.com" title="Sanjay Patel <spatel+llvm@rotateright.com>"> <span class="fn">Sanjay Patel</span></a>
</span></b>
<pre>I didn't step through the full SPEC example to see what happens, but changing
SLP to use smaller groups of GEPs seems to have restored the perf by preventing
the vectorization entirely in SetupFastFullPelSearch():
<a href="https://reviews.llvm.org/rL374183">https://reviews.llvm.org/rL374183</a></pre>
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