https://bugs.llvm.org/show_bug.cgi?id=36184
Bug ID: 36184
Summary: Regression: Segfault in LICM after upgrading to 6.0.0
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: a...@crichton.co
CC: llvm-bugs@lists.llvm.org
Created attachment 19788
--> https://bugs.llvm.org/attachment.cgi?id=19788&action=edit
crashing bytecode
We've *almost* upgraded to LLVM 6 in rust-lang/rust [1] but we seem to have hit
what is hopefully our last blocker, a segfault when optimizing IR on MSVC. The
attached IR will non-deterministically segfault in `opt` during the LICM
passes. I've reproduced this with:
for i in `seq 1 1000`; do
echo $i
opt -O2 -o /dev/null foo.ll || break
done
Sometimes it takes up to 100 runs to crash, but I've been able to crash on a
debug and a release build of LLVM, both on Linux and on Windows.
[1]: https://github.com/rust-lang/rust/pull/47828
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