[PATCH] D143945: [AMDGPU] Add legalization case for PTR_ADD on buffer pointers

[Krzysztof Drewniak via Phabricator via llvm-commits]

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On buffer pointers (address space 7), we want PTR_ADD to take 32-bit
offsets, and so, unlike all other address spaces, we do not want to
enforce the condition that those G_PTR_ADD instructions have an offset
of the same size as their pointer operand.

(Also, fix some comments and missing pattern fragment definitions
while we're here.)

Depends on D143526 <https://reviews.llvm.org/D143526>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143945

Files:
  llvm/lib/Target/AMDGPU/AMDGPU.h
  llvm/lib/Target/AMDGPU/AMDGPUInstructions.td
  llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
  llvm/lib/Target/AMDGPU/SIInstrInfo.td
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-ptr-add.mir

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