[PATCH] D48569: [AMDGPU] Convert rcp to rcp_iflag

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec created this revision.
rampitec added reviewers: b-sumner, arsenm.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl.

If a source of rcp instruction is a result of any conversion from
an integer convert it into rcp_iflag instruction. No FP exception
can ever happen except division by zero if a single precision rcp
argument is a representation of an integral number.


https://reviews.llvm.org/D48569

Files:
  lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  lib/Target/AMDGPU/AMDGPUISelLowering.h
  lib/Target/AMDGPU/AMDGPUInstrInfo.td
  lib/Target/AMDGPU/SIISelLowering.cpp
  lib/Target/AMDGPU/SIISelLowering.h
  lib/Target/AMDGPU/VOP1Instructions.td
  test/CodeGen/AMDGPU/rcp_iflag.ll
  test/CodeGen/AMDGPU/sdiv.ll
  test/CodeGen/AMDGPU/sdivrem24.ll
  test/CodeGen/AMDGPU/udiv.ll
  test/CodeGen/AMDGPU/udivrem24.ll

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