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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 - IPSCCP produces wrong code when passing structs"
href="https://bugs.llvm.org/show_bug.cgi?id=42738">42738</a>
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<th>Summary</th>
<td>IPSCCP produces wrong code when passing structs
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<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>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jeroen.dobbelaere@synopsys.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22279" name="attach_22279" title="test_works.ll">attachment 22279</a> <a href="attachment.cgi?id=22279&action=edit" title="test_works.ll">[details]</a></span>
test_works.ll
IPSCCP produces wrong code when passing structs (with constants).
(For the complete files, see the attachments; The only difference is the
absence of 'i32 %dummy0, i32 %dummmy1' arguments for '@f')
test_works.ll:
define internal i32 @f((i32 %dummy0, i32 %dummy1, %struct.S %s.coerce) #0 {
....
ret i32 123
}
define dso_local i32 @main() #0 {
%call = call i32 @f(%struct.S { i64 100 })
call void @do_report(i32 undef, i32 undef, i32 %call)
ret i32 0
}
'opt -S -o - --ipsccp test_works.ll' results in:
define dso_local i32 @main() #0 {
%call = call i32 @f(i32 undef, i32 undef, %struct.S { i64 100 })
call void @do_report(i32 123)
ret i32 0
}
define internal i32 @f(i32 %dummy0, i32 %dummy1, %struct.S %s.coerce) #0 {
...
ret i32 undef
}
test_fails.ll:
define internal i32 @f(%struct.S %s.coerce) #0 {
....
ret i32 123
}
define dso_local i32 @main() #0 {
%call = call i32 @f(%struct.S { i64 100 })
call void @do_report(i32 %call)
ret i32 0
}
'opt -S -o - --ipsccp test_fails.ll' results in:
define dso_local i32 @main() #0 {
%call = call i32 @f(%struct.S { i64 100 })
call void @do_report(i32 %call) ; NOTE THE DIFFERENCE HERE
ret i32 0
}
define internal i32 @f(i32 %dummy0, i32 %dummy1, %struct.S %s.coerce) #0 {
...
ret i32 undef
}</pre>
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