https://bugs.llvm.org/show_bug.cgi?id=50049
Bug ID: 50049
Summary: Apparently-valid .ll file hangs llc
Product: new-bugs
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: s...@google.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 24775
--> https://bugs.llvm.org/attachment.cgi?id=24775&action=edit
.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.)
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