[PATCH] D59992: [SLP] Add support for commutative icmp/fcmp predicates

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: ABataev, dtemirbulatov, vporpo.
Herald added a project: LLVM.

For the cases where the icmp/fcmp predicate is commutative, use reorderInputsAccordingToOpcode to collect and commute the operands.

This requires a helper to recognise commutativity in both general Instruction and CmpInstr types - the CmpInst::isCommutative doesn't overload the Instruction::isCommutative method for reasons I'm not clear on (maybe because its based on predicate not opcode?!?).

If at all possible I'd like to get this in before the D57059 <https://reviews.llvm.org/D57059>/D59973 <https://reviews.llvm.org/D59973> refactors.


Repository:
  rL LLVM

https://reviews.llvm.org/D59992

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

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