<html>
<head>
<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ICE on valid code with -O1: fatal error: error in backend: Instruction Combining seems stuck in an infinite loop after 100 iterations."
href="https://bugs.llvm.org/show_bug.cgi?id=50969">50969</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>ICE on valid code with -O1: fatal error: error in backend: Instruction Combining seems stuck in an infinite loop after 100 iterations.
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</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>C
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cnsun@uwaterloo.ca
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>$ clang-trunk -v
clang version 13.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
65eb4028ad0322115ff5420499806db79a27289e)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cnsun/usr/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ cat mutant.c
mul_double ()
{
int j, *prod;
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (j = 0; j < 4; j++)
for (; j < 4; j++)
*prod = 0;
}
$ clang-trunk -O1 -w mutant.c
fatal error: error in backend: Instruction Combining seems stuck in an infinite
loop after 100 iterations.
clang-13: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 13.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
65eb4028ad0322115ff5420499806db79a27289e)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cnsun/usr/bin
clang-13: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-13: note: diagnostic msg: /tmp/mutant-000f7c.c
clang-13: note: diagnostic msg: /tmp/mutant-000f7c.sh
clang-13: note: diagnostic msg:
********************</pre>
</div>
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