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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed optimization: bitwise OR"
href="https://bugs.llvm.org/show_bug.cgi?id=44136">44136</a>
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<th>Summary</th>
<td>Missed optimization: bitwise OR
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>zamazan4ik@tut.by
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>For the following code:
bool foo(int A, int B) {
return (A | B) == A;
}
clang(trunk) with '-O3 -march=haswell' produces:
foo(int, int): # @foo(int, int)
or esi, edi
cmp esi, edi
sete al
ret
but GCC(trunk) with '-O3 -march=haswell' produces:
foo(int, int):
andn eax, edi, esi
sete al
ret
Godbolt playground: <a href="https://godbolt.org/z/MZNdWW">https://godbolt.org/z/MZNdWW</a></pre>
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</p>
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