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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 - fmul of undef ConstantExpr not folded to undef"
href="https://bugs.llvm.org/show_bug.cgi?id=16257">bug 16257</a>
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<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>spatel+llvm@rotateright.com
</td>
</tr>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Fixed By Commit(s)</td>
<td>
</td>
<td>327058
</td>
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<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - fmul of undef ConstantExpr not folded to undef"
href="https://bugs.llvm.org/show_bug.cgi?id=16257#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - fmul of undef ConstantExpr not folded to undef"
href="https://bugs.llvm.org/show_bug.cgi?id=16257">bug 16257</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>There was a good discussion about the semantics here:
<a href="http://lists.llvm.org/pipermail/llvm-dev/2014-August/076169.html">http://lists.llvm.org/pipermail/llvm-dev/2014-August/076169.html</a>
<a href="http://lists.llvm.org/pipermail/llvm-dev/2014-September/076326.html">http://lists.llvm.org/pipermail/llvm-dev/2014-September/076326.html</a>
...but I'm not sure any code changes resulted from that.
I stumbled into FP undef again recently (without finding the above threads or
this bug):
<a href="http://lists.llvm.org/pipermail/llvm-dev/2018-February/121444.html">http://lists.llvm.org/pipermail/llvm-dev/2018-February/121444.html</a>
<a href="http://lists.llvm.org/pipermail/llvm-dev/2018-March/121481.html">http://lists.llvm.org/pipermail/llvm-dev/2018-March/121481.html</a>
And I'm fixing the LangRef and code based on that thread:
<a href="https://reviews.llvm.org/D44258">https://reviews.llvm.org/D44258</a>
<a href="https://reviews.llvm.org/D44216">https://reviews.llvm.org/D44216</a>
<a href="https://reviews.llvm.org/D44308">https://reviews.llvm.org/D44308</a>
<a href="https://reviews.llvm.org/D44318">https://reviews.llvm.org/D44318</a>
This particular example should be fixed with:
<a href="https://reviews.llvm.org/rL327058">https://reviews.llvm.org/rL327058</a></pre>
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