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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Apparently-valid .ll file hangs llc"
href="https://bugs.llvm.org/show_bug.cgi?id=50049">50049</a>
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<th>Summary</th>
<td>Apparently-valid .ll file hangs llc
</td>
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<th>Product</th>
<td>new-bugs
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>srj@google.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>Created <span class=""><a href="attachment.cgi?id=24775" name="attach_24775" title=".ll file that will hang llc with certain arguments.">attachment 24775</a> <a href="attachment.cgi?id=24775&action=edit" title=".ll file that will hang llc with certain arguments.">[details]</a></span>
.ll file that will hang llc with certain arguments.
The enclosed .ll file was generated by Halide.
For builds of llc under LLVM12-rc1 and current top-of-tree LLVM13,
$ llc -mcpu=penryn -o - -O3 bad.ll
hangs (or takes exponential time).
Notes:
- Using -O0 "heals" this, but -O1 and -O2 also appear to hang.
- Using other x86 variants for -mcpu mostly seem to work. (-mcpu=corei7 also
hangs, but most others I've tried seem to succeed.)</pre>
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