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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [InstCombine] sub (select %c, %x, %y), %x -> select %c, 0, (sub %y, %x)"
href="https://bugs.llvm.org/show_bug.cgi?id=44426">44426</a>
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<th>Summary</th>
<td>[InstCombine] sub (select %c, %x, %y), %x -> select %c, 0, (sub %y, %x)
</td>
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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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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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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<p>
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<pre>Name: sub (select %c, %x, %y), %x -> select %c, 0, (sub %y, %x)
%o = select i1 %c, i64 %x, i64 %y
%r = sub i64 %o, %x
=>
%n = sub i64 %y, %x
%r = select i1 %c, i64 0, i64 %n
<a href="https://rise4fun.com/Alive/D5U">https://rise4fun.com/Alive/D5U</a>
This can allow further folding to happen:
<a href="https://godbolt.org/z/atBtSx">https://godbolt.org/z/atBtSx</a></pre>
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