[PATCH] D30418: [SLP] Preserve IR flags when vectorizing horizontal reductions.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev created this revision.

The SLP vectorizer should propagate IR-level optimization hints/flags
(nsw, nuw, exact, fast-math) when converting scalar horizontal
reductions instructions into vectors, just like for other vectorized
instructions.
It doe not include IR propagation for extra arguments, we need to handle
original scalar operations for extra args to propagate correct flags.


https://reviews.llvm.org/D30418

Files:
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/X86/horizontal.ll
  test/Transforms/SLPVectorizer/X86/scheduling.ll

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