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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 - "function-local metadata used in wrong function" with -argpromotion -verify -dse"
href="https://bugs.llvm.org/show_bug.cgi?id=33641">33641</a>
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<th>Summary</th>
<td>"function-local metadata used in wrong function" with -argpromotion -verify -dse
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<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>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mikael.holmen@ericsson.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=18732" name="attach_18732" title="reproducer">attachment 18732</a> <a href="attachment.cgi?id=18732&action=edit" title="reproducer">[details]</a></span>
reproducer
Reproduce with:
opt -argpromotion -verify -dse -S -o /dev/null reduced.ll
which gives:
function-local metadata used in wrong function
i16 addrspace(1)* %p
LLVM ERROR: Broken function found, compilation aborted!
With -print-before-all -print-after-all -debug we see
*** IR Dump Before Promote 'by reference' arguments to scalars ***
define internal void @bar(i16 addrspace(1)* %p) {
bb1:
call void @llvm.dbg.value(metadata i16 addrspace(1)* %p, i64 0, metadata !3,
metadata !5), !dbg !6
ret void
}
ARG PROMOTION: Promoting to:
declare internal void @bar()
From:
define internal void @bar(i16 addrspace(1)* %p) {
bb1:
call void @llvm.dbg.value(metadata i16 addrspace(1)* %p, i64 0, metadata !3,
metadata !5), !dbg !6
ret void
}
CGSCCPASSMGR: Refreshing SCC with 1 nodes:
Call graph node for function: 'bar'<<0x5116db0>> #uses=0
CGSCCPASSMGR: SCC Refresh didn't change call graph.
*** IR Dump After Promote 'by reference' arguments to scalars ***
define internal void @bar() {
bb1:
call void @llvm.dbg.value(metadata i16 addrspace(1)* %p, i64 0, metadata !3,
metadata !5), !dbg !6
ret void
}
So the %p argument to bar has been removed, but the call to @llvm.dbg.value
which uses %p is still left.
Since ArgumentPromotion changes the argument list by creating a new function
with the desired argument list, we then get the error about using meta data
from the wrong function.</pre>
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