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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang accepts implicit conversion between vector types"
href="https://llvm.org/bugs/show_bug.cgi?id=25557">25557</a>
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<th>Summary</th>
<td>clang accepts implicit conversion between vector types
</td>
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<th>Product</th>
<td>clang
</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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>philip.pfaffe@gmail.com
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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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<p>
<div>
<pre>Clang silently accepts implicit conversions between vector types.
Minimal example:
// clang++ -std=c++11 -mavx2
#include <cstdint>
#include <immintrin.h>
int main() {
uint8_t C[8] = {1,2,3,4,5,6,7,8};
__m256i V = _mm256_loadu_si256((__m256i*)C);
__m256i Two = _mm256_set1_epi32(2);
__m256 R = _mm256_div_ps(V, Two);
}
V and Two are here implicitly converted from __m256i to __m256. Both are
typedefs of float and longlong vectors, respectively.
I think clang should at least throw a warning here (which is what icc does) or,
even better, an error (the gcc behaviour).</pre>
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