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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 - Use less constants in clamp codegen"
href="https://bugs.llvm.org/show_bug.cgi?id=46967">46967</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Use less constants in clamp codegen
</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>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<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>int fast_min(int x, int y) {
return (x < y) ? x : y;
}
int fast_max(int x, int y) {
return (x > y) ? x : y;
}
int fast_clamp(int x, int min, int max) {
return fast_max(fast_min(x, max), min);
}
int use_fast_clamp(int x) {
return fast_clamp(x, 128, 255);
}
Clang:
use_fast_clamp: # @use_fast_clamp
cmp edi, 256
mov ecx, 255
cmovl ecx, edi
cmp ecx, 127
mov eax, 128
cmovg eax, ecx
ret
GCC:
use_fast_clamp:
mov eax, 255
mov edx, 128
cmp edi, eax
cmovle eax, edi
cmp eax, edx
cmovl eax, edx
ret</pre>
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