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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Poor codegen for comieq/comine intrinsics feeding a branch"
href="https://bugs.llvm.org/show_bug.cgi?id=38960">38960</a>
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<th>Summary</th>
<td>[X86] Poor codegen for comieq/comine intrinsics feeding a branch
</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>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<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
</td>
</tr>
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<th>Reporter</th>
<td>craig.topper@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>#include <x86intrin.h>
void foo();
void test_mm_comieq_ss(__m128 A, __m128 B) {
if (_mm_comieq_ss(A, B))
foo();
}
Produces
test_mm_comieq_ss(float __vector(4), float __vector(4)): #
@test_mm_comieq_ss(float __vector(4), float __vector(4))
vcomiss %xmm1, %xmm0
setnp %al
sete %cl
andb %al, %cl
movzbl %cl, %eax
testl %eax, %eax
je .LBB0_1
jmp foo() # TAILCALL
.LBB0_1:
retq
Ideally we should only produce a vcomiss and two conditional jumps.</pre>
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