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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] Failure to flip cmov cc for -abs(x)"
href="https://bugs.llvm.org/show_bug.cgi?id=50991">50991</a>
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<th>Summary</th>
<td>[X86] Failure to flip cmov cc for -abs(x)
</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>
</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, llvm-dev@redking.me.uk, pengfei.wang@intel.com, spatel+llvm@rotateright.com
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<p>
<div>
<pre><a href="https://godbolt.org/z/frMb5fahz">https://godbolt.org/z/frMb5fahz</a>
#include <cmath>
char nabs8(char x) {
return -std::abs(x);
}
short nabs16(short x) {
return -std::abs(x);
}
int nabs32(int x) {
return -std::abs(x);
}
long long nabs64(long long x) {
return -std::abs(x);
}
clang:
nabs64(long long):
movq %rdi, %rax
negq %rax
cmovlq %rdi, %rax
negq %rax
retq
gcc:
nabs64(long long):
movq %rdi, %rax
negq %rax
cmovns %rdi, %rax
ret</pre>
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</p>
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