[PATCH] D158602: [AMDGPU] Don't wait for counters in chain function prologues

[Diana Picus via Phabricator via llvm-commits]

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All counters (lgkmcnt, vmcnt, storecnt, etc.) are presumed in an unknown
state at function entry, so we needn't insert waits for them in the
prologue.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158602

Files:
  llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
  llvm/test/CodeGen/AMDGPU/amdgpu-cs-chain-cc.ll
  llvm/test/CodeGen/AMDGPU/amdgpu-cs-chain-preserve-cc.ll

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