[PATCH] D73588: AMDGPU: Enhancement on FDIV lowering in AMDGPUCodeGenPrepare

[Changpeng Fang via Phabricator via llvm-commits]

cfang updated this revision to Diff 241807.
cfang added a comment.

update based on comment.

1. 2.5ulp threshold for fdiv.fast, 1.0 ulp for rcp
2. introduce a function lowerUsingFDivFast to use fdiv.fast, this function should be called after lowerUsingRcp because rcp is the prefedrence

This update should clear some confusion.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D73588/new/

https://reviews.llvm.org/D73588

Files:
  llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
  llvm/lib/Target/AMDGPU/SIISelLowering.cpp
  llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-fdiv.ll
  llvm/test/CodeGen/AMDGPU/fdiv.f16.ll

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