[PATCH] D146031: [AMDGPU] Add MMOs for GFX11 Streamout Instructions

[Diana Picus via Phabricator via llvm-commits]

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The GFX11 NGG Streamout Instructions perform atomic operations on
dedicated registers. At the moment, they lack machine memory operands,
which causes the si-memory-legalizer pass to treat them conservatively
and introduce several unnecessary waits and cache invalidations.

This patch introduces a new address space to represent these special
registers and teaches instruction selection to add memory operands with
this new address space to DS_ADD/SUB_GS_REG_RTN.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146031

Files:
  llvm/docs/AMDGPUUsage.rst
  llvm/include/llvm/IR/IntrinsicsAMDGPU.td
  llvm/lib/Target/AMDGPU/AMDGPU.h
  llvm/lib/Target/AMDGPU/SIISelLowering.cpp
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ds.add.gs.reg.rtn.ll
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ds.sub.gs.reg.rtn.ll

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