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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Wrong alignment with _mm_move_epi64()"
href="http://llvm.org/bugs/show_bug.cgi?id=22010">22010</a>
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<th>Summary</th>
<td>Wrong alignment with _mm_move_epi64()
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.5
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>vvsed@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This program crashes due to wrong alignment.
_mm_move_epi64() translates to vmovapd instead of movq.
Similar _mm_loadl_epi64() intrinsic works well.
Tested it with -O2 -mavx2 options; perhaps that doesn't matter.
#include <stdlib.h>
#include <stdio.h>
#include <emmintrin.h>
__attribute__((aligned(16))) int zz[8];
int main()
{
__m128i r = _mm_move_epi64(*(__m128i *)(zz + 1));
r = _mm_castpd_si128(_mm_loadh_pd(_mm_castsi128_pd(r), (const double
*)zz));
printf("%d", _mm_cvtsi128_si32(r));
return 0;
}
// 64-bit
vmovapd xmm0,xmmword ptr [13F2422F4h] //movq
vmovhpd xmm0,xmm0,qword ptr [13F2422F0h]
// 32-bit
vmovapd xmm0,xmmword ptr ds:[0F13034h] //movq
vmovhpd xmm0,xmm0,qword ptr ds:[0F13030h]</pre>
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