<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 - 'Assertion `L->isRecursivelyLCSSAForm(*DT, *LI) && "Indvars did not preserve LCSSA!"' failed.' with -indvars"
href="https://bugs.llvm.org/show_bug.cgi?id=38674">38674</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>'Assertion `L->isRecursivelyLCSSAForm(*DT, *LI) && "Indvars did not preserve LCSSA!"' failed.' with -indvars
</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>
<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>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>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20758" name="attach_20758" title="reproducer">attachment 20758</a> <a href="attachment.cgi?id=20758&action=edit" title="reproducer">[details]</a></span>
reproducer
opt -S -o - bbi-16913.ll -indvars
crashes with
opt: ../lib/Transforms/Scalar/IndVarSimplify.cpp:2519: bool (anonymous
namespace)::IndVarSimplify::run(llvm::Loop *): Assertion
`L->isRecursivelyLCSSAForm(*DT, *LI) && "Indvars did not preserve LCSSA!"'
failed.
The function looks like this when the assertion fails
define i32 @f1() {
entry:
br label %for.cond1.preheader
for.cond1.preheader: ; preds = %for.end9,
%entry
br label %for.cond4.preheader
for.cond4.preheader: ; preds = %for.end,
%for.cond1.preheader
%zext = zext i16 1 to i32
br label %for.body6
for.cond4: ; preds = %for.body6
%cmp5 = icmp ult i32 %inc, 2
br i1 %cmp5, label %for.body6, label %for.end
for.body6: ; preds = %for.cond4,
%for.cond4.preheader
%storemerge26 = phi i32 [ 0, %for.cond4.preheader ], [ %inc, %for.cond4 ]
%0 = icmp eq i32 %storemerge26, %zext
%inc = add nuw nsw i32 %storemerge26, 1
br i1 %0, label %return.loopexit, label %for.cond4
for.end: ; preds = %for.cond4
br i1 false, label %for.cond4.preheader, label %for.end9
for.end9: ; preds = %for.end
br i1 false, label %for.cond1.preheader, label %return.loopexit3
return.loopexit: ; preds = %for.body6
unreachable
return.loopexit3: ; preds = %for.end9
%inc11.lcssa = phi i32 [ %zext, %for.end9 ]
br label %return
return: ; preds =
%return.loopexit3
ret i32 %inc11.lcssa
}
This started happening with r335020.</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>