[PATCH] D60897: [SLP] Look-ahead operand reordering heuristic.

[Vasileios Porpodas via Phabricator via llvm-commits]

vporpo created this revision.
vporpo added reviewers: RKSimon, ABataev, dtemirbulatov, Ayal, hfinkel.
vporpo added a project: LLVM.
Herald added a subscriber: llvm-commits.

This patch introduces a new heuristic for guiding operand reordering. The new "look-ahead" heuristic can look beyond the immediate predecessors. This helps break ties when the immediate predecessors have identical opcodes (see lit test for an example).


Repository:
  rL LLVM

https://reviews.llvm.org/D60897

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

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