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<body><span class="vcard"><a class="email" href="mailto:davide@freebsd.org" title="Davide Italiano <davide@freebsd.org>"> <span class="fn">Davide Italiano</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Optimization introduces error when right shifting by integer width."
href="https://bugs.llvm.org/show_bug.cgi?id=33578">bug 33578</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
</td>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>davide@freebsd.org
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Optimization introduces error when right shifting by integer width."
href="https://bugs.llvm.org/show_bug.cgi?id=33578#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Optimization introduces error when right shifting by integer width."
href="https://bugs.llvm.org/show_bug.cgi?id=33578">bug 33578</a>
from <span class="vcard"><a class="email" href="mailto:davide@freebsd.org" title="Davide Italiano <davide@freebsd.org>"> <span class="fn">Davide Italiano</span></a>
</span></b>
<pre>I think this is UB.
Clang warns you if you fold a constant in the source.
ub.cpp:5:27: warning: shift count >= width of type [-Wshift-count-overflow]
return ((x << 0) | (x >> (64 - 0)));
^ ~~~~~~~~</pre>
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