[PATCH] D153022: AMDGPU: Use correct lowering for llvm.log2.f32

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: AMDGPU, foad, jhuber6, rampitec, Pierre-vh, cdevadas.
Herald added subscribers: StephenFan, jdoerfert, kerbowa, hiraditya, tpr, dstuttard, yaxunl, jvesely, kzhuravl.
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arsenm requested review of this revision.
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Herald added a project: LLVM.

We previously directly codegened to v_log_f32, which is broken for
denormals. The lowering isn't complicated, you simply need to scale
denormal inputs and adjust the result. Note log and log10 are still
not accurate enough, and will be fixed separately.


https://reviews.llvm.org/D153022

Files:
  llvm/docs/AMDGPUUsage.rst
  llvm/docs/LangRef.rst
  llvm/docs/ReleaseNotes.rst
  llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h
  llvm/lib/Target/AMDGPU/AMDGPUInstrInfo.td
  llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
  llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.h
  llvm/lib/Target/AMDGPU/SIISelLowering.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/fpow.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-flog.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-flog10.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-flog2.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-fpow.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-fpowi.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.powi.ll
  llvm/test/CodeGen/AMDGPU/llvm.log.ll
  llvm/test/CodeGen/AMDGPU/llvm.log10.ll
  llvm/test/CodeGen/AMDGPU/llvm.log2.ll

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