[PATCH] D152901: AMDGPU: Add llvm.amdgcn.exp2 intrinsic

[Matt Arsenault via Phabricator via cfe-commits]

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Provide direct access to v_exp_f32 and v_exp_f16, so we can start
correctly lowering the generic exp intrinsics.

      

Unfortunately have to break from the usual naming convention of
matching the instruction name and stripping the v_ prefix. exp is
already taken by the export intrinsic. On the clang builtin side, we
have a choice of maintaining the convention to the instruction name,
or following the intrinsic name.


https://reviews.llvm.org/D152901

Files:
  clang/include/clang/Basic/BuiltinsAMDGPU.def
  clang/lib/CodeGen/CGBuiltin.cpp
  clang/test/CodeGenOpenCL/builtins-amdgcn.cl
  llvm/docs/AMDGPUUsage.rst
  llvm/include/llvm/IR/IntrinsicsAMDGPU.td
  llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h
  llvm/lib/Target/AMDGPU/AMDGPUInstrInfo.td
  llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
  llvm/lib/Target/AMDGPU/VOP1Instructions.td
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.exp2.ll

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