<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - opt -speculative-execution moves dbg.value(%0 before definition of %0"
href="https://bugs.llvm.org/show_bug.cgi?id=46267">46267</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>opt -speculative-execution moves dbg.value(%0 before definition of %0
</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=23595" name="attach_23595" title="bbi-43737.ll reproducer">attachment 23595</a> <a href="attachment.cgi?id=23595&action=edit" title="bbi-43737.ll reproducer">[details]</a></span>
bbi-43737.ll reproducer
Repriduce with:
opt -speculative-execution -S -o - bbi-43737.ll
Input:
define void @f() {
entry:
br i1 undef, label %land.rhs, label %land.end
land.rhs: ; preds = %entry
%0 = load i16, i16* undef, align 1
call void @llvm.dbg.value(metadata i16 %0, metadata !9, metadata
!DIExpression()), !dbg !10
br label %land.end
land.end: ; preds = %land.rhs, %entry
ret void
}
Output:
define dso_local void @f() {
entry:
call void @llvm.dbg.value(metadata i16 %0, metadata !6, metadata
!DIExpression()), !dbg !10
br i1 undef, label %land.rhs, label %land.end
land.rhs: ; preds = %entry
%0 = load i16, i16* undef, align 1
br label %land.end
land.end: ; preds = %land.rhs, %entry
ret void
}
So the dbg.value is hoisted to the entry block, before the definition of the
value it uses.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>