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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 - Missed optimization for range check for negative numbers"
href="https://bugs.llvm.org/show_bug.cgi?id=47550">47550</a>
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<th>Summary</th>
<td>Missed optimization for range check for negative numbers
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<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>
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<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>bool rangecheck (int i, int x)
{
return i > x && i < 0;
}
Clang:
rangecheck(int, int): # @rangecheck(int, int)
cmp edi, esi
setg cl
test edi, edi
sets al
and al, cl
ret
GCC:
rangecheck(int, int):
cmp edi, esi
setg al
shr edi, 31
and eax, edi
ret
<a href="https://godbolt.org/z/PPTP4o">https://godbolt.org/z/PPTP4o</a></pre>
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</p>
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