[Patch]change the cost for small trees in SLP vectorizer
yjiang at apple.com
Mon Sep 23 17:05:55 PDT 2013
In the SLP vectorizer, we do not try to vectorize tiny trees and set the cost to zero and the default threshold is zero. But we may use -slp-threshold to set it to negative value. To guarantee that we always disable the vectorization on tiny trees, we want to set it to infinity.
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