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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - InstCombine breaks calls of casted functions with type attributes"
href="https://bugs.llvm.org/show_bug.cgi?id=50697">50697</a>
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<th>Summary</th>
<td>InstCombine breaks calls of casted functions with type attributes
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>12.0
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>sean.m.bartell@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
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<pre>In LLVM 12.0.0, InstCombine can break call instructions of casted functions
when type attributes (byval, sret, etc.) are involved. Example input:
%struct0 = type { i32 }
%struct1 = type { float }
declare void @callee(%struct0* sret(%struct0))
define void @caller() {
%1 = alloca %struct1
call void bitcast (void (%struct0*)* @callee to void (%struct1*)*)(%struct1*
sret(%struct1) %1)
unreachable
}
When run through `opt -S -instcombine`, the output is:
%struct0 = type { i32 }
declare void @callee(%struct0* sret(%struct0))
define void @caller() {
%1 = alloca %struct0, align 8
call void @callee(%struct0* nonnull sret(%struct1) %1)
unreachable
}
This is invalid because the argument type (%struct0*) no longer matches the
attribute type (%struct1).</pre>
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