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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Failure to simplify -std::abs(a) <= 0"
href="https://bugs.llvm.org/show_bug.cgi?id=39475">39475</a>
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</tr>
<tr>
<th>Summary</th>
<td>Failure to simplify -std::abs(a) <= 0
</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>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<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>filcab@gmail.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com, tilkax@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>#include <algorithm>
bool bar(int a)
{
return -std::abs(a) <= 0;
}
<a href="https://godbolt.org/z/8CYqjj">https://godbolt.org/z/8CYqjj</a>
clang:
_Z3bari: # @_Z3bari
movl %edi, %eax
negl %eax
testl %edi, %edi
cmovsl %edi, %eax
testl %eax, %eax
setle %al
retq
gcc:
_Z3bari:
movl $1, %eax
ret</pre>
</div>
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