[PATCH] D158002: AMDGPU: InstCombine amdgcn.rcp(amdgcn.sqrt) -> amdgcn.rsq

[Matt Arsenault via Phabricator via llvm-commits]

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We currently have some wrong combines in the backend that
approximately do this.


https://reviews.llvm.org/D158002

Files:
  llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
  llvm/test/Transforms/InstCombine/AMDGPU/rcp-contract-rsq.ll

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