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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 - Incorrect optimization in InstSimplify"
href="https://bugs.llvm.org/show_bug.cgi?id=39510">39510</a>
</td>
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<th>Summary</th>
<td>Incorrect optimization in InstSimplify
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<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>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Transformation Utilities
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>sbc@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The following C code is (I believe) incorrectly being reduces to a constant
value:
```
int f (int a) {
a = a > 0 ? a : -a;
if (a == 2)
return 0;
else
return 1;
}
```
$ clang vrp-2.c -O1 -c -emit-llvm -S -o -
...
define dso_local i32 @f(i32 %a) local_unnamed_addr #0 {
entry:
ret i32 1
}
...
I tracked it down to this recent change:
<a href="https://reviews.llvm.org/D53844">https://reviews.llvm.org/D53844</a></pre>
</div>
</p>
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