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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AArch64] failed to form 'ubfiz'"
href="https://bugs.llvm.org/show_bug.cgi?id=43191">43191</a>
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<th>Summary</th>
<td>[AArch64] failed to form 'ubfiz'
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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>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: AArch64
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>spatel+llvm@rotateright.com
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<th>CC</th>
<td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, peter.smith@linaro.org, Ties.Stuij@arm.com
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<p>
<div>
<pre>As discussed in:
<a href="https://reviews.llvm.org/D67021">https://reviews.llvm.org/D67021</a>
...there seems to be something missing in the transforms/recognition between
TLI.isDesirableToCommuteWithShift() and
AArch64DAGToDAGISel::tryBitfieldInsertInZeroOp() with this example:
define i32 @ubfiz(i8 %x) {
%conv = zext i8 %x to i32
%r = shl nuw nsw i32 %conv, 3
ret i32 %r
}
$ llc -o - ubfiz.ll
and w8, w0, #0xff
lsl w0, w8, #3
But this could be:
ubfiz w0, w0, #3, #8</pre>
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