[PATCH] D65036: AMDGPU/LoadStoreOptimizer: combine MMOs when merging instructions

[Tom Stellard via Phabricator via llvm-commits]

tstellar created this revision.
tstellar added reviewers: arsenm, nhaehnle.
Herald added subscribers: hiraditya, t-tye, tpr, dstuttard, yaxunl, wdng, jvesely, kzhuravl.
Herald added a project: LLVM.

The LoadStoreOptimizer was creating instructions with 2
MachineMemOperands, which meant they were assumed to alias with all other instructions,
because MachineInstr:mayAlias() returns true when an instruction has multiple
MachineMemOperands.

This was preventing these instructions from being merged again, and was
giving the scheduler less freedom to reorder them.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D65036

Files:
  llvm/lib/Target/AMDGPU/SILoadStoreOptimizer.cpp
  llvm/test/CodeGen/AMDGPU/merge-load-store.mir
  llvm/test/CodeGen/MIR/AMDGPU/load-store-opt-dlc.mir

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