[PATCH] D153158: AMDGPU: Implement llvm.get.rounding

[Matt Arsenault via Phabricator via llvm-commits]

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There are really two rounding modes, so only return the standard
values if both modes are the same. Otherwise, return a bitmask
representing the two modes.

      

Annoyingly the register doesn't use the same values as FLT_ROUNDS. Use
a simple integer table we can shift into to convert.


https://reviews.llvm.org/D153158

Files:
  llvm/docs/AMDGPUUsage.rst
  llvm/docs/LangRef.rst
  llvm/docs/ReleaseNotes.rst
  llvm/include/llvm/CodeGen/ISDOpcodes.h
  llvm/lib/Target/AMDGPU/SIISelLowering.cpp
  llvm/lib/Target/AMDGPU/SIISelLowering.h
  llvm/lib/Target/AMDGPU/SIModeRegisterDefaults.cpp
  llvm/lib/Target/AMDGPU/SIModeRegisterDefaults.h
  llvm/test/CodeGen/AMDGPU/llvm.get.rounding.ll

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