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<body><span class="vcard"><a class="email" href="mailto:efriedma@quicinc.com" title="Eli Friedman <efriedma@quicinc.com>"> <span class="fn">Eli Friedman</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WONTFIX - __builtin_constant_p resolves differently with loop unrolling at -O3"
href="https://bugs.llvm.org/show_bug.cgi?id=43420">bug 43420</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>WONTFIX
</td>
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<tr>
<td style="text-align:right;">CC</td>
<td>
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<td>efriedma@quicinc.com
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WONTFIX - __builtin_constant_p resolves differently with loop unrolling at -O3"
href="https://bugs.llvm.org/show_bug.cgi?id=43420#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WONTFIX - __builtin_constant_p resolves differently with loop unrolling at -O3"
href="https://bugs.llvm.org/show_bug.cgi?id=43420">bug 43420</a>
from <span class="vcard"><a class="email" href="mailto:efriedma@quicinc.com" title="Eli Friedman <efriedma@quicinc.com>"> <span class="fn">Eli Friedman</span></a>
</span></b>
<pre>Apparently, gcc actually has multiple unrolling passes; at least one runs
before __builtin_constant_p is resolved, and at least one runs after. (You can
see this by modifying the trip count of the loop.)
We aren't going to try to match the exact unroll threshold gcc uses for "early"
unrolling at -O3.</pre>
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