[PATCH] D76207: [PowerPC] implement target hook isProfitableToHoist

[ChenZheng via Phabricator via llvm-commits]

shchenz created this revision.
shchenz added reviewers: power-llvm-team, hfinkel.
Herald added subscribers: llvm-commits, steven.zhang, wuzish, kbarton, hiraditya, nemanjai.
Herald added a project: LLVM.

On Powerpc fma is faster than fadd + fmul for some types, (PPCTargetLowering::isFMAFasterThanFMulAndFAdd). we should implement target hook `isProfitableToHoist` to prevent `simplifyCFGpass` from breaking fma pattern by hoisting fmul to predecessor block.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D76207

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCISelLowering.h
  llvm/test/Transforms/SimplifyCFG/PowerPC/prefer-fma.ll

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