[PATCH] D135071: [AMDGPU] Implement TargetTransformInfo canAlwaysSinkRead

[Carl Ritson via Phabricator via llvm-commits]

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Allow sinking of invariant loads across critical edges during Sink
pass when amdgpu-aggressive-load-sinking attribute is set to true.
This should always be safe.
Typically it reduces VGPR pressure, but can increase SGPR pressure.

If amdgpu-always-sink-loads is *also* set true then allow sinking
of all loads.
The intention is that the frontend sets this after validating the
shader has no memory writes and no EXEC manipulation (e.g. kills).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135071

Files:
  llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
  llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
  llvm/lib/Target/AMDGPU/MIMGInstructions.td
  llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
  llvm/test/CodeGen/AMDGPU/aggressive-load-sinking.ll

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