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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 DUPLICATE - InstCombine: fadd (fsub nnan ninf 0.0, X), X => 0 incorrect for X = NaN"
href="https://bugs.llvm.org/show_bug.cgi?id=26958">bug 26958</a>
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<table border="1" cellspacing="0" cellpadding="8">
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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>DUPLICATE
</td>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - InstCombine: fadd (fsub nnan ninf 0.0, X), X => 0 incorrect for X = NaN"
href="https://bugs.llvm.org/show_bug.cgi?id=26958#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - InstCombine: fadd (fsub nnan ninf 0.0, X), X => 0 incorrect for X = NaN"
href="https://bugs.llvm.org/show_bug.cgi?id=26958">bug 26958</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>(In reply to Andres Noetzli from <a href="show_bug.cgi?id=26958#c0">comment #0</a>)
<span class="quote">> This behavior is implemented in SimplifyFAddInst() in InstructionSimplify.
> The optimization just checks whether nnan and ninf appear at least once
> somewhere on the fadd and the fsub instruction but as the example above
> indicates, this condition seems too weak.</span >
The condition is both too weak and too strong. This bug was filed first, but we
have more comments in <a class="bz_bug_link
bz_status_NEW "
title="NEW - InstructionSimplify turns NaN to 0.0"
href="show_bug.cgi?id=27151">bug 27151</a>, so let me mark this as a duplicate since they
are for the same problem.
*** This bug has been marked as a duplicate of <a class="bz_bug_link
bz_status_NEW "
title="NEW - InstructionSimplify turns NaN to 0.0"
href="show_bug.cgi?id=27151">bug 27151</a> ***</pre>
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