[PATCH] #pragma vectorize

[Tyler Nowicki]

Hi,

Please review the attached patch for adding pragma vectorize syntax / vectorization hints to clang.

pragma vectorize
* supports the options enable, disable, unroll(_value_), and width(_value_)
* options are turned into vectorization hints that are used during codegen to add metadata to the conditional branch of the for, while, and do-while loops.
* enable forces the vectorizer to consider the loop, for example when compiling with Os
* disable prevents vectorization of the loop
* The _value_ specified by unroll(_value_) and width(_value_) must be a positive integer. It will be used to set the llvm.vectorizer.unroll or llvm.vectorizer.width metadata values.

Thank you,

Tyler Nowicki
Apple

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