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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 - Suboptimal codegen for vector pattern M < 0 ? X : Y"
href="https://bugs.llvm.org/show_bug.cgi?id=50603">50603</a>
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<th>Summary</th>
<td>Suboptimal codegen for vector pattern M < 0 ? X : Y
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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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>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, pengfei.wang@intel.com, spatel+llvm@rotateright.com
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<p>
<div>
<pre>typedef int V __attribute__((vector_size(16)));
V lt_zero_x_y(V mask, V x, V y) { return mask < 0 ? x : y; }
GCC 9+ -O3 -mavx512f
lt_zero_x_y(int __vector(4), int __vector(4), int __vector(4)):
vblendvps xmm0, xmm2, xmm1, xmm0
ret
LLVM -O3 -mavx512f
lt_zero_x_y(int __vector(4), int __vector(4), int __vector(4)): #
@lt_zero_x_y(int __vector(4), int __vector(4), int __vector(4))
vpcmpeqd xmm3, xmm3, xmm3
vpcmpgtd k1, zmm0, zmm3
vpblendmd zmm0 {k1}, zmm1, zmm2
vzeroupper
ret
<a href="https://godbolt.org/z/W9fshMoao">https://godbolt.org/z/W9fshMoao</a></pre>
</div>
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