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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - opt -indvars moves definition without updating debug info"
href="https://bugs.llvm.org/show_bug.cgi?id=46182">46182</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>opt -indvars moves definition without updating debug info
</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>Linux
</td>
</tr>
<tr>
<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>Scalar Optimizations
</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>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23567" name="attach_23567" title="bbi-43604.ll">attachment 23567</a> <a href="attachment.cgi?id=23567&action=edit" title="bbi-43604.ll">[details]</a></span>
bbi-43604.ll
Reproduce with:
opt -indvars -S -o - bbi-43604.ll
In the input we have:
define void @f() {
entry:
%b = alloca [1 x i16], align 1
%arraydecay = getelementptr inbounds [1 x i16], [1 x i16]* %b, i32 0, i32 0
%0 = ptrtoint i16* %arraydecay to i16
call void @llvm.dbg.value(metadata i16 %0, metadata !9, metadata
!DIExpression()), !dbg !14
br label %for.cond
for.cond: ; preds = %for.cond, %entry
br i1 true, label %for.cond, label %for.end
for.end: ; preds = %for.cond
ret void
}
and in the output we get:
define void @f() {
entry:
%b = alloca [1 x i16], align 1
%arraydecay = getelementptr inbounds [1 x i16], [1 x i16]* %b, i32 0, i32 0
call void @llvm.dbg.value(metadata i16 %0, metadata !9, metadata
!DIExpression()), !dbg !14
br label %for.cond
for.cond: ; preds = %for.cond, %entry
br i1 true, label %for.cond, label %for.end
for.end: ; preds = %for.cond
%0 = ptrtoint i16* %arraydecay to i16
ret void
}
so the definition of %0 is now done after the use of %0 in the dbg.value.</pre>
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