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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [ARM] missed pattern for and-not + compare (bics)"
href="https://llvm.org/bugs/show_bug.cgi?id=27328">27328</a>
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<th>Summary</th>
<td>[ARM] missed pattern for and-not + compare (bics)
</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>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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: ARM
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>spatel+llvm@rotateright.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>define i1 @andnot_cmp(i32 %x, i32 %y) {
%noty = xor i32 %y, -1
%and = and i32 %x, %noty
%cmp = icmp eq i32 %and, 0
ret i1 %cmp
}
I don't know ARM very well, but couldn't this be "bics"?
$ ./llc -o - andn.ll -mtriple=armv7-apple-darwin -mcpu=cortex-a8
_andnot_cmp:
@ BB#0:
mvn r2, r1
mov r1, #0
tst r0, r2
movweq r1, #1
mov r0, r1
bx lr</pre>
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