<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 -instcombine fails with "LLVM ERROR: Instruction Combining seems stuck in an infinite loop after 100 iterations.""
href="https://bugs.llvm.org/show_bug.cgi?id=49122">49122</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>opt -instcombine fails with "LLVM ERROR: Instruction Combining seems stuck in an infinite loop after 100 iterations."
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>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>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24508" name="attach_24508" title="bbi-52743.ll reproducer">attachment 24508</a> <a href="attachment.cgi?id=24508&action=edit" title="bbi-52743.ll reproducer">[details]</a></span>
bbi-52743.ll reproducer
Reproduce with:
opt -S -o - bbi-52743.ll -instcombine
Result:
LLVM ERROR: Instruction Combining seems stuck in an infinite loop after 100
iterations.
This seems to start happening with commit 6102310d814a:
[InstSimplify][EarlyCSE] Try to CSE PHI nodes in the same basic block
Before the above commit it succeeds with
-instcombine-infinite-loop-threshold=2
I'm not sure if this is the same problem as is reported in
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [InstCombiner] fatal error: error in backend: Instruction Combining seems stuck in an infinite loop"
href="show_bug.cgi?id=47788">https://bugs.llvm.org/show_bug.cgi?id=47788</a>
and
<a class="bz_bug_link
bz_status_NEW "
title="NEW - ICE on x86_64-linux-gnu at `-O3` (Instruction Combining seems stuck in an infinite loop after 100 iterations.)"
href="show_bug.cgi?id=47344">https://bugs.llvm.org/show_bug.cgi?id=47344</a>
or not.</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>