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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [InstCombine] ashr+and+icmp not simplified"
href="https://bugs.llvm.org/show_bug.cgi?id=44754">44754</a>
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<th>Summary</th>
<td>[InstCombine] ashr+and+icmp not simplified
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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
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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>nikita.ppv@gmail.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>define i1 @foo(i32 %a) {
%ashr = ashr i32 %a, 5
%and = and i32 %ashr, -2
%cmp = icmp slt i32 %and, 1
ret i1 %cmp
}
is not simplified to
define i1 @foo(i32 %a) {
%and2 = and i32 %a, -64
%cmp = icmp slt i32 %and2, 32
ret i1 %cmp
}
but could be (<a href="https://rise4fun.com/Alive/FkZq">https://rise4fun.com/Alive/FkZq</a>).
Encountered this as fallout from a worklist order change in
test/Transforms/InstCombine/pr17827.ll.</pre>
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