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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 - min/max with 1/-1 could use TEST instead of CMP"
href="https://bugs.llvm.org/show_bug.cgi?id=47049">47049</a>
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<th>Summary</th>
<td>min/max with 1/-1 could use TEST instead of CMP
</td>
</tr>
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<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>
<tr>
<th>Priority</th>
<td>P
</td>
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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>
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<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
</td>
</tr></table>
<p>
<div>
<pre>#define max(a,b) (((a) > (b))? (a) : (b))
#define min(a,b) (((a) < (b))? (a) : (b))
int smin(int x)
{
return min(x,1);
}
int smax(int x)
{
return max(x,-1);
}
Clang:
smin(int): # @smin(int)
cmp edi, 2
mov eax, 1
cmovl eax, edi
ret
smax(int): # @smax(int)
cmp edi, -2
mov eax, -1
cmovg eax, edi
ret
GCC:
smin(int):
test edi, edi
mov eax, 1
cmovle eax, edi
ret
smax(int):
test edi, edi
mov eax, -1
cmovns eax, edi
ret
<a href="https://godbolt.org/z/E3EEcn">https://godbolt.org/z/E3EEcn</a></pre>
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