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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AVX512] FP_TO_SINT truncating conversion intrinsics don't seem to round towards zero"
href="https://llvm.org/bugs/show_bug.cgi?id=27951">27951</a>
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<th>Summary</th>
<td>[AVX512] FP_TO_SINT truncating conversion intrinsics don't seem to round towards zero
</td>
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<th>Product</th>
<td>libraries
</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>Windows NT
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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
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>According to the intel documentation I can find the '_mm_cvtt*_*' truncation
intrinsics should round towards zero, but the implementations in
avx512fintrin.h appear to use the MXCSR.RC value:
e.g.
static __inline__ int __DEFAULT_FN_ATTRS
_mm_cvttsd_i32 (__m128d __A)
{
return (int) __builtin_ia32_vcvttsd2si32 ((__v2df) __A,
_MM_FROUND_CUR_DIRECTION);
}
shouldn't this be:
static __inline__ int __DEFAULT_FN_ATTRS
_mm_cvttsd_i32 (__m128d __A)
{
return (int) __builtin_ia32_vcvttsd2si32 ((__v2df) __A,
_MM_FROUND_TO_ZERO);
}
etc. ?</pre>
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