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This patch adds an analysis pass that searches for computation idioms in the program. It is a tentative implementation, that invokes the pattern-recognition pass from within the vectorizer, only on loops that are candidate for vectorization. The pattern is replaced only if it can be vectorized. We may want instead to invoke it as a general pass independent of the vectorizer that searches for such idioms anywhere in the program (as part of a tree-combine pass?).
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