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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - InstCombine - matchRotate doesn't match constant rotation amounts"
href="https://bugs.llvm.org/show_bug.cgi?id=46895">46895</a>
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<th>Summary</th>
<td>InstCombine - matchRotate doesn't match constant rotation amounts
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
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<p>
<div>
<pre>define i64 @rot(i64 %a0) {
%1 = shl i64 %a0, 1
%2 = lshr i64 %a0, 63
%3 = or i64 %1, %2
ret i64 %3
}
I'd expect this to fold to:
define i64 @rot(i64 %a0) {
%1 = tail call i64 @llvm.fshl.i64(i64 %a0, i64 %a0, i64 1)
ret i64 %1
}</pre>
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