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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 - Too much narrowing when converting dbg.declare to dbg.value"
href="https://bugs.llvm.org/show_bug.cgi?id=35400">35400</a>
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<th>Summary</th>
<td>Too much narrowing when converting dbg.declare to dbg.value
</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>
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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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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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>mattias.v.eriksson@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=19462" name="attach_19462" title="Reproduce with: opt -sroa -S dbgvaluesext.ll">attachment 19462</a> <a href="attachment.cgi?id=19462&action=edit" title="Reproduce with: opt -sroa -S dbgvaluesext.ll">[details]</a></span>
Reproduce with: opt -sroa -S dbgvaluesext.ll
I think this is a bug in how a llvm.dbg.declare is converted to llvm.dbg.value.
Input, the variable "bl" is 64 bit on the stack:
define i64 @refAddshSat(i32 %param32) {
bb2:
%local64 = alloca i64
call void @llvm.dbg.declare(metadata i64* %local64, metadata !10, metadata
!DIExpression()), !dbg !12
%_tmp20 = sext i32 %param32 to i64
store i64 %_tmp20, i64* %local64
%_tmp24 = load i64, i64* %local64
ret i64 %_tmp24
}
!10 = !DILocalVariable(name: "bl", scope: !9, line: 58, type: !11)
!11 = !DIBasicType(name: "long long", size: 64, encoding: DW_ATE_signed)
After SROA we get "bl" as a 32 bit temporary, this looks incorrect to me:
define i64 @refAddshSat(i32 %param32) {
bb2:
%_tmp20 = sext i32 %param32 to i64
call void @llvm.dbg.value(metadata i32 %param32, metadata !4, metadata
!DIExpression()), !dbg !11
ret i64 %_tmp20
}
!4 = !DILocalVariable(name: "bl", scope: !5, line: 58, type: !10)
!10 = !DIBasicType(name: "long long", size: 64, encoding: DW_ATE_signed)</pre>
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