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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed min max optimization"
href="https://bugs.llvm.org/show_bug.cgi?id=39898">39898</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missed min max optimization
</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>Linux
</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>
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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 minmax(int num) {
int t = std::max(15, num);
return std::min(1, t);
}
Current codegen -O3, x86-64:
minmax(int): # @minmax(int)
cmp edi, 14
mov ecx, 15
cmovg ecx, edi
cmp ecx, 2
mov eax, 1
cmovl eax, ecx
ret
We can fold it to 1 (GCC does it).</pre>
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