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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Missed select threading case"
href="http://llvm.org/bugs/show_bug.cgi?id=15340">15340</a>
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<tr>
<th>Summary</th>
<td>Missed select threading case
</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>All
</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>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>benny.kra@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Found this while looking at disassembly of a hot method in clang:
int *f(int *);
void foo(int *x, int *y) {
while (x != 0) {
x = f(x);
x = x == y ? x : 0;
}
}
void bar(int *x, int *y) {
while (x != 0) {
x = f(x);
if (x == y)
break;
}
}
icc and gcc turn these two into virtually identical code, LLVM emits a cmov
contraption for foo().</pre>
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