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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - sNAN is not handled correct on legacy X87."
href="https://llvm.org/bugs/show_bug.cgi?id=23158">23158</a>
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<th>Summary</th>
<td>sNAN is not handled correct on legacy X87.
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>chunyang.cdai2@gmail.com
</td>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>When handling the float or double signaling NaN (sNAN) value with legacy X87 on
x86. If it loads signal NaN to the x87 FP, the sNAN will be changed into into
quiet NANs (qNAN). And Sometimes the value will be handled with normal regiter
because of optimzation. This will leads to difference result.</pre>
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