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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missing canonicalization of select of bitchecks into icmp"
href="https://bugs.llvm.org/show_bug.cgi?id=36950">36950</a>
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<th>Summary</th>
<td>Missing canonicalization of select of bitchecks into icmp
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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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>Scalar Optimizations
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>lebedev.ri@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>Copied from <a class="bz_bug_link
bz_status_NEW "
title="NEW - Cannot canonicalize (x & 1) || (x & 2) well"
href="show_bug.cgi?id=17564">https://bugs.llvm.org/show_bug.cgi?id=17564</a>
There is a missing instcombine to get rid of select
<a href="https://rise4fun.com/Alive/gEy">https://rise4fun.com/Alive/gEy</a>
After which the assembly is much better:
<a href="https://godbolt.org/g/iAYRup">https://godbolt.org/g/iAYRup</a>
The only difference after that is in "and edi, 3" vs. "test dil, 3"</pre>
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