[PATCH] Optimize unrolled reductions in LoopStrengthReduce

[hfinkel at anl.gov]

I agree, this needs a register-pressure threshold. Also, I thought that the loop vectorizer would also perform this transformation as part of its interleaved unrolling capability. Does it not? If not, perhaps it really belongs there (and the vectorizer already has register pressure heuristics)?


http://reviews.llvm.org/D7128

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