<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - _mm_setzero_si64 violates the spec by generating xorps instead of pxor"
href="https://bugs.llvm.org/show_bug.cgi?id=35869">35869</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>_mm_setzero_si64 violates the spec by generating xorps instead of pxor
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>gonzalobg88@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>In the `<mmintrin.h>` header, the intrinsic `__mm_setzero_si64` [0] implemented
as follows:
static __inline__ __m64 __DEFAULT_FN_ATTRS
_mm_setzero_si64(void)
{
return (__m64){ 0LL };
}
generates `xorps` [1] violating the spec [2] which says that it should generate
the instruction sequence `pxor mm, mm`.
[0]:
<a href="https://github.com/llvm-mirror/clang/blob/master/lib/Headers/mmintrin.h#L1296">https://github.com/llvm-mirror/clang/blob/master/lib/Headers/mmintrin.h#L1296</a>
[1]: <a href="https://godbolt.org/g/FnQYkf">https://godbolt.org/g/FnQYkf</a>
[2]:
<a href="https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_setzero_si64&expand=4727,4727">https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_setzero_si64&expand=4727,4727</a></pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>