[all-commits] [llvm/llvm-project] 48a1ee: [AMDGPU] Remove redundant s_wait_xcnt after implic...

[Dark Steve via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 48a1ee7bc8e1d740edf635c39e0223b9b02a6ae1
      https://github.com/llvm/llvm-project/commit/48a1ee7bc8e1d740edf635c39e0223b9b02a6ae1
  Author: Dark Steve <Prasoon.Mishra at amd.com>
  Date:   2026-05-28 (Thu, 28 May 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
    M llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
    M llvm/lib/Target/AMDGPU/SIInstrInfo.h
    M llvm/test/CodeGen/AMDGPU/flat-saddr-atomics.ll
    M llvm/test/CodeGen/AMDGPU/wait-xcnt-drain.mir
    M llvm/test/CodeGen/AMDGPU/wait-xcnt.mir

  Log Message:
  -----------
  [AMDGPU] Remove redundant s_wait_xcnt after implicit XCNT drains (#198823)

On gfx1250 several instructions implicitly drain XCNT in hardware:
`s_barrier_wait`/`signal`/`signal_isfirst`, `s_sendmsg`, PC-changes etc.
This patch will remove redundant `s_wait_xcnt` after implicit XCNT
drains.

Pre-commit tests on #198772
Fix: LCOMPILER-1665



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