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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 - Failure to optimize result of function in switch optimally"
href="https://bugs.llvm.org/show_bug.cgi?id=45966">45966</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Failure to optimize result of function in switch optimally
</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>gabravier@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>inline int check(int i, int j)
{
if (i == j)
return 0;
else if (i > j)
return 1;
else
return 2;
}
int foo(int i, int j)
{
switch (check(i, j))
{
case 0:
return i + j;
case 1:
return i;
case 2:
return j;
}
}
`foo` can be optimized to `return (i == j) ? (i + j) : ((i > j) ? i : j)`. This
transformation is done by GCC, but not by LLVM.</pre>
</div>
</p>
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