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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - _mm_extract_pi16 and _mm_insert_pi16 warn with -Wvector-conversion"
href="https://bugs.llvm.org/show_bug.cgi?id=44589">44589</a>
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<th>Summary</th>
<td>_mm_extract_pi16 and _mm_insert_pi16 warn with -Wvector-conversion
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>9.0
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Headers
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>clang@evan.coeusgroup.com
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23032" name="attach_23032" title="Patch to cast the vectors to __v4hi">attachment 23032</a> <a href="attachment.cgi?id=23032&action=edit" title="Patch to cast the vectors to __v4hi">[details]</a></span>
Patch to cast the vectors to __v4hi
When using either _mm_extract_pi16 or _mm_insert_pi16 with the
-Wvector-conversion warning enabled, clang will emit a diagnostic since the
builtins used by both functions expect a vector of 4 shorts, but __m64 is a
vector of 1 long long.
Here is a trivial test case:
#include <xmmintrin.h>
int16_t extract(__m64 a) {
return _mm_extract_pi16(a, 0);
}
__m64 insert(__m64 a, int d) {
return _mm_insert_pi16(a, d, 0);
}
A patch to simply cast the vectors to __v4hi instead of __m64 (which works for
me) is attached.</pre>
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