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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: redundant llvm.assume emitted when debug info is present"
href="https://bugs.llvm.org/show_bug.cgi?id=37726">37726</a>
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<th>Summary</th>
<td>InstCombine: redundant llvm.assume emitted when debug info is present
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>vsk@apple.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Running `opt -instcombine` on test/Transforms/InstCombine/assume.ll produces
different output with/without debug info present. To reproduce the issue, do:
# Baseline
$ $OPT -instcombine test/Transforms/InstCombine/assume.ll -S -o -
# With debug info
$ $OPT -O1 test/Transforms/InstCombine/assume.ll -o - -debugify-each
-debugify-quiet | $OPT -strip -S
With debug info present, the last function in the file has what looks like a
redundant llvm.assume call:
define i32 @assumption_conflicts_with_known_bits(i32, i32) {
tail call void @llvm.assume(i1 false)
tail call void @llvm.assume(i1 false)
ret i32 0
}
Without debug info, the function looks like this:
define i32 @assumption_conflicts_with_known_bits(i32, i32) {
tail call void @llvm.assume(i1 false)
ret i32 0
}</pre>
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</p>
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