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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missing simplification (x > y) AND (x > z) to x > MAX (y,z))"
href="https://bugs.llvm.org/show_bug.cgi?id=42207">42207</a>
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<th>Summary</th>
<td>Missing simplification (x > y) AND (x > z) to x > MAX (y,z))
</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>Linux
</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>Transformation Utilities
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>unsigned int max (unsigned int i, unsigned int m, unsigned int n) {
return i > m && i > n;
}
unsigned int max2 (unsigned int i, unsigned int m, unsigned int n) {
return i > std::max (m,n);
}
Clang -O3
max(unsigned int, unsigned int, unsigned int):
cmp edi, esi
seta al
cmp edi, edx
seta cl
and cl, al
movzx eax, cl
ret
max2(unsigned int, unsigned int, unsigned int): int, unsigned int)
cmp esi, edx
cmovb esi, edx
xor eax, eax
cmp esi, edi
setb al
ret
GCC generates same code for both functions.</pre>
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