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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AArch64] Missed CCMP opportunity"
href="https://llvm.org/bugs/show_bug.cgi?id=26084">26084</a>
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<th>Summary</th>
<td>[AArch64] Missed CCMP opportunity
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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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>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: AArch64
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>mcrosier@codeaurora.org
</td>
</tr>
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<th>CC</th>
<td>bmakam@codeaurora.org, llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Test case:
int test(int A, int B) {
return !(A > 0 && B > 0);
}
When targeting AArch64 at -O3 we currently generate the following assembly:
test:
cmp w0, #1
cset w8, lt
cmp w1, #1
cset w9, lt
orr w0, w8, w9
ret
We should be able to generate something like this:
test:
cmp w0, wzr
ccmp w1, wzr, 4, gt
cset w0, le
ret
which removes 1 cset and 1 orr.</pre>
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