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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unrecognized rotate patterns"
href="https://bugs.llvm.org/show_bug.cgi?id=51748">51748</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Unrecognized rotate patterns
</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>unsigned rol1(unsigned x, int y)
{
return (x << y) | (x >> (64-y));
}
define dso_local i32 @rol1(i32 %0, i32 %1) local_unnamed_addr #0 {
%3 = shl i32 %0, %1
%4 = sub nsw i32 64, %1
%5 = lshr i32 %0, %4
%6 = or i32 %5, %3
ret i32 %6
}
--------------------------------
define i32 @src(i32 %0, i32 %1) {
%2:
%3 = shl i32 %0, %1
%4 = sub nsw i32 64, %1
%5 = lshr i32 %0, %4
%6 = or i32 %5, %3
ret i32 %6
}
=>
define i32 @tgt(i32 %0, i32 %1) {
%2:
%3 = fshl i32 %0, i32 %0, i32 %1
ret i32 %3
}
<a href="https://alive2.llvm.org/ce/z/6jDaR_">https://alive2.llvm.org/ce/z/6jDaR_</a></pre>
</div>
</p>
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