[PATCH] D101633: [AMDGPU] Set number vgprs used in PS shaders based on input registers actually used

[David Stuttard via Phabricator via llvm-commits]

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For PS shaders we can use the input SPI_PS_INPUT_ENA and SPI_PS_INPUT_ADDR
registers

Calculate the number of VGPR registers used as input VGPRs based on these
registers rather than the arguments passed in (this conservatively always
allocates the maximum).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D101633

Files:
  llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
  llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.h
  llvm/test/CodeGen/AMDGPU/ps-shader-arg-count.ll

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