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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 elimination of comparison with zero"
href="https://bugs.llvm.org/show_bug.cgi?id=47279">47279</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missed elimination of comparison with zero
</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>
<tr>
<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>extern void foo (void);
void
bar (int z, unsigned int y)
{
long long x = z;
y &= 0xf;
if (x >= 0 && x < (int) y)
foo ();
}
Clang -O3:
bar: # @bar
test edi, edi
js .LBB0_2
and esi, 15
cmp esi, edi
jbe .LBB0_2
jmp foo # TAILCALL
.LBB0_2:
ret
GCC -O3:
bar:
and esi, 15
cmp edi, esi
jb .L4
ret
.L4:
jmp foo</pre>
</div>
</p>
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