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<body><span class="vcard"><a class="email" href="mailto:michael.m.kuperstein@intel.com" title="Michael Kuperstein <michael.m.kuperstein@intel.com>"> <span class="fn">Michael Kuperstein</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=22265">bug 22265</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
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>michael.m.kuperstein@intel.com
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>DUPLICATE
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=22265#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=22265">bug 22265</a>
from <span class="vcard"><a class="email" href="mailto:michael.m.kuperstein@intel.com" title="Michael Kuperstein <michael.m.kuperstein@intel.com>"> <span class="fn">Michael Kuperstein</span></a>
</span></b>
<pre>This looks like a duplicate of PR15941 (albeit with a smaller reproducer).
In David's reproducer, the volatile load gets folded into a CMOV (that came
from the select), and the non-volatile load gets folded into the INC (that came
from the add).
Because of the volatility of the first load, we have a chain from the CMOV to
the INC, but the CMOV also depends on the result of the INC (through EFLAGS),
and we get a cycle.
*** This bug has been marked as a duplicate of <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - ICE when compiling with clang 3.4"
href="show_bug.cgi?id=15941">bug 15941</a> ***</pre>
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