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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SSE compare float to integer _mm_comige_ss family of instructions has changed behavior"
href="https://llvm.org/bugs/show_bug.cgi?id=28510">28510</a>
</td>
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<th>Summary</th>
<td>SSE compare float to integer _mm_comige_ss family of instructions has changed behavior
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<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>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jujjyl@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>STR:
#include <xmmintrin.h>
#include <math.h>
#include <stdio.h>
int main()
{
__m128 a = _mm_set1_ps(42.f);
__m128 b = _mm_set1_ps(NAN);
int equal = _mm_comieq_ss(a, b);
printf("equal: %d\n", equal);
}
Clang/LLVM <= 3.8, GCCs and Visual Studios will print "equal: 1" as expected
(although unintuitive), but the current Clang trunk will print "equal: 0"
instead.
We are currently discussing this change in behavior in
<a href="https://github.com/kripken/emscripten/issues/4435">https://github.com/kripken/emscripten/issues/4435</a> as well.</pre>
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