https://bugs.llvm.org/show_bug.cgi?id=33706
Bug ID: 33706
Summary: [Loop vectorizer] miscompile since r272715
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: wolfgang_p...@playstation.sony.com
CC: llvm-bugs@lists.llvm.org
Created attachment 18763
--> https://bugs.llvm.org/attachment.cgi?id=18763&action=edit
test case (different output with -O2 vs. -O0).
The attached test case produces different output for -O2 vs. -O0 compilation,
which we bisected down to the loop vectorizer. The failure started with
r272715, but appears to be masked whenever the GVNHoist pass is enabled (which
it currently isn't at r307289).
Apologies for not providing a more narrowed test case with opt/llc, but opt
resisted my attempts to find a set of switches that reproduces the failure.
Compile with
clang -O2 --target=x86_64-unknown-linux-gnu
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