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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [InstCombine] fold or-of-selects with inverted predicates and zero operands"
href="https://bugs.llvm.org/show_bug.cgi?id=32791">32791</a>
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<th>Summary</th>
<td>[InstCombine] fold or-of-selects with inverted predicates and zero operands
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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>All
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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>spatel+llvm@rotateright.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>This is a variation of an existing regression test in
test/Transforms/InstCombine/logical-select.ll:
define i32 @poo(i32 %a, i32 %b, i32 %c, i32 %d) {
%cmp1 = icmp slt i32 %a, %b
%sel1 = select i1 %cmp1, i32 %c, i32 0
%cmp2 = icmp sge i32 %a, %b
%sel2 = select i1 %cmp2, i32 %d, i32 0
%or = or i32 %sel1, %sel2
ret i32 %or
}
We should recognize the inverted predicates and disguised 'and' ops and fold
this to:
%cmp = icmp slt i32 %a, %b
%sel = select i1 %cmp, i32 %c, i32 %d</pre>
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