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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [InstSimplify] missed X==0 fold of bool value"
href="https://bugs.llvm.org/show_bug.cgi?id=52546">52546</a>
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<th>Summary</th>
<td>[InstSimplify] missed X==0 fold of bool value
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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>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>
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<pre>Forking this off from <a class="bz_bug_link
bz_status_NEW "
title="NEW - Dead Code Elimination Regression at -O3 (trunk vs 13.0.0)"
href="show_bug.cgi?id=52543">bug 52543</a> :
define i1 @src(i1 %b) {
%not = xor i1 %b, true
%s = sext i1 %not to i32
%cmp = icmp eq i32 %s, 0
ret i1 %cmp
}
define i1 @tgt(i1 %b) {
ret i1 %b
}
Note that "opt -instcombine" gets this example, and "opt -instsimplify" gets
the sibling fold when the predicate is "ne", but we miss this:
<a href="https://alive2.llvm.org/ce/z/vGKMJA">https://alive2.llvm.org/ce/z/vGKMJA</a></pre>
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