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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - DebugInfo: Wrong value for inlined formal_parameters of a function inlined twice"
href="https://llvm.org/bugs/show_bug.cgi?id=23260">23260</a>
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<th>Summary</th>
<td>DebugInfo: Wrong value for inlined formal_parameters of a function inlined twice
</td>
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<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<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>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>DebugInfo
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dexonsmith@apple.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dblaikie@gmail.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat t.c
void sink(void);
static __attribute__((always_inline)) void bar(int a) { sink(); }
void foo(void) {
bar(0);
bar(1);
}
$ clang -g -O2 t.c -S -emit-llvm -o - | grep llvm.dbg.value
tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !12, metadata
!17) #3, !dbg !18
tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !12, metadata
!17) #3, !dbg !21
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
Notice that both intrinsics get `i32 0`.
This happens during dead argument elimination.
*** IR Dump After Dead Argument Elimination ***; ModuleID = 't.c'
; Function Attrs: alwaysinline nounwind ssp uwtable
define internal fastcc void @bar() #1 {
entry:
call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !12, metadata !20),
!dbg !21
call void @sink(), !dbg !22
ret void, !dbg !23
}
I suspect the right solution is to lose the variable entirely.</pre>
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