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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] Shouldn't (U)COMISS/SD be commutable?"
href="https://bugs.llvm.org/show_bug.cgi?id=39484">39484</a>
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<th>Summary</th>
<td>[X86] Shouldn't (U)COMISS/SD be commutable?
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<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>
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<th>Priority</th>
<td>P
</td>
</tr>
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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>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>andrea.dibiagio@gmail.com, craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<p>
<div>
<pre><a href="https://godbolt.org/z/jjdScX">https://godbolt.org/z/jjdScX</a>
#include <x86intrin.h>
int comiss_ss(__m128 x, float *y) {
return _mm_comieq_ss(x, _mm_load_ss(y));
}
int comiss_ss_2(__m128 x, float *y) {
return _mm_comieq_ss(_mm_load_ss(y), x);
}
int comiss_ps(__m128 x, __m128 *y) {
return _mm_comieq_ss(x, *y);
}
int comiss_ps_2(__m128 x, __m128 *y) {
return _mm_comieq_ss(*y, x);
}
_Z9comiss_ssDv4_fPf: # @_Z9comiss_ssDv4_fPf
vcomiss (%rdi), %xmm0
setnp %al
sete %cl
andb %al, %cl
movzbl %cl, %eax
retq
_Z11comiss_ss_2Dv4_fPf: # @_Z11comiss_ss_2Dv4_fPf
vmovss (%rdi), %xmm1 # xmm1 = mem[0],zero,zero,zero
vcomiss %xmm0, %xmm1
setnp %al
sete %cl
andb %al, %cl
movzbl %cl, %eax
retq
_Z9comiss_psDv4_fPS_: # @_Z9comiss_psDv4_fPS_
vcomiss (%rdi), %xmm0
setnp %al
sete %cl
andb %al, %cl
movzbl %cl, %eax
retq
_Z11comiss_ps_2Dv4_fPS_: # @_Z11comiss_ps_2Dv4_fPS_
vmovaps (%rdi), %xmm1
vcomiss %xmm0, %xmm1
setnp %al
sete %cl
andb %al, %cl
movzbl %cl, %eax
retq</pre>
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