[PATCH] D37759: [SLP] Mark conditional ops of hor reduction SelectInst as Ignored + propagate IR flags.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev created this revision.

If the min/max horizontal reduction is found, compare operands of the
SelectInst are considered as instruction that externally use reduction
values. But they must be ignored and their operands must be replaced by
UndefValues.
Also, patch fixes propagation of IR flags. Vectorized compare
instructions did not inherit IR flags from the scalar instructions.


https://reviews.llvm.org/D37759

Files:
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/X86/horizontal-list.ll
  test/Transforms/SLPVectorizer/X86/horizontal-minmax.ll

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