[PATCH] Fix for previously reverted SLPVectorizer cost model improvement

[Tyler Nowicki]

Hi,

This patch modifies r205260 which was previously reverted by r205018 because it a crash. The original patch by Arch Robison and Arnold Schwaighofer.

This patch stops the SLP vectorizer from trying to vectorize a call that is not trivially vectorizable. An intrinsic is not trivially vectorized if any of the arguments cannot be simply packed together into a tuple. For example, the call to CTLZ cannot be trivially replaced with a vector intrinsic because the second parameter is scalar in both its scalar and vector forms.

Tyler Nowicki

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