[PATCH] D79176: [AMDGPU] Remove unnecessary s_waitcnt between VMEM loads

[Jay Foad via Phabricator via llvm-commits]

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

VMEM loads of the same type (sampler vs no sampler) are guaranteed to
write their result registers in order, so there is no need for an
s_waitcnt even if they write to overlapping vgprs.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79176

Files:
  llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
  llvm/test/CodeGen/AMDGPU/mubuf-legalize-operands.ll
  llvm/test/CodeGen/AMDGPU/shl.ll
  llvm/test/CodeGen/AMDGPU/wait.ll
  llvm/test/CodeGen/AMDGPU/waitcnt-vmem-waw.mir

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