http://bugs.llvm.org/show_bug.cgi?id=32135
Bug ID: 32135
Summary: Loop vectorizer miscompile
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: craig.top...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 18052
--> http://bugs.llvm.org/attachment.cgi?id=18052&action=edit
Test case
The attached test case produces different output when compiled at -O1 and -O2.
The power of 2 trip count of the first loop seems to be significant. Values of
64, 128, and 256 all expose the problem. 16 does not.
It's also significant that the index for the second loop is a smaller type than
the first loop. If the same index type is used for both the loop is reduced to
a single store before the loop vectorizer even runs.
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