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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86][AVX] vbroadcastf128 not always used"
href="https://bugs.llvm.org/show_bug.cgi?id=38949">38949</a>
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<th>Summary</th>
<td>[X86][AVX] vbroadcastf128 not always used
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
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<p>
<div>
<pre><a href="https://gcc.godbolt.org/z/twKLg7">https://gcc.godbolt.org/z/twKLg7</a>
Under all but the simplest circumstances we don't lower to vbroadcastf128 when
we could.
__m256 test0(float *a) {
__m256 v = _mm256_broadcast_ps((__m128 const*)a);
return v;
}
test0:
vbroadcastf128 (%rdi), %ymm0 # ymm0 = mem[0,1,0,1]
retq
void test1(float *a) {
__m256 v = _mm256_broadcast_ps((__m128 const*)a);
*((__m256*)a) = v;
}
test1:
vmovups (%rdi), %xmm0
vinsertf128 $1, %xmm0, %ymm0, %ymm0
vmovaps %ymm0, (%rdi)
retq</pre>
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