Arnold Schwaighofer 46db725a43 opt: Mirror vectorization presets of clang ...

clang enables vectorization at optimization levels > 1 and size level < 2. opt
should behave similarily.

Loop vectorization and SLP vectorization can be disabled with the flags
-disable-(loop/slp)-vectorization.

llvm-svn: 196294

2013-12-03 16:33:06 +00:00

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