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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Code gen for contracted FP operation wrong"
href="http://llvm.org/bugs/show_bug.cgi?id=16201">16201</a>
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<th>Summary</th>
<td>Code gen for contracted FP operation wrong
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</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>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>tydeman@tybor.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Code generation appears to be wrong for the contracted floating-point
operation:
p = x*y;
m = -p;
z = -m - (x*y);
where all the variables are of type float or double. The other three forms:
z = x*y - p;
z = x*y + m;
z = p - (x*y);
appear to be OK.
This is clang 3.3-0.4 on Linux Fedora Core 19 in 32-bit mode on an Intel
Core 2 Duo CPU.
Command line options: -std=c1x -O0 -pedantic</pre>
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