[PATCH] D13949: [SLP] Treat SelectInsts as reduction values.

[Charlie Turner via llvm-commits]

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Certain workloads, in particular sum-of-absdiff loops, can be vectorized using SLP if it can treat select instructions as reduction values.

The test case is a bit awkward. The AArch64 cost model needs some tuning to not be so pessimistic about selects. I've had to tweak the SLP threshold here.

Repository:
  rL LLVM

http://reviews.llvm.org/D13949

Files:
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/AArch64/horizontal.ll

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