[PATCH] Optimize unrolled reductions in LoopStrengthReduce

[Quentin Colombet]

> FWIW I'm not such a huge fan of using register pressure heuristics in the middle end


FWIW, I agree, but this is not what LSR currently does and since the backends do not expect that yet, I would prefer moving with cautious.

Q.


http://reviews.llvm.org/D7128

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