[all-commits] [llvm/llvm-project] 1bc63a: [AMDGPU] Fix duplicate s_wait_asynccnt on gfx12-plus

[Sameer Sahasrabuddhe via All-commits]

  Branch: refs/heads/users/ssahasra/fix-async-dupe
  Home:   https://github.com/llvm/llvm-project
  Commit: 1bc63af63891c5b8ab365f426b76e59fe3452f11
      https://github.com/llvm/llvm-project/commit/1bc63af63891c5b8ab365f426b76e59fe3452f11
  Author: Sameer Sahasrabuddhe <sameer.sahasrabuddhe at amd.com>
  Date:   2026-04-07 (Tue, 07 Apr 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
    M llvm/test/CodeGen/AMDGPU/asyncmark-gfx12plus.ll

  Log Message:
  -----------
  [AMDGPU] Fix duplicate s_wait_asynccnt on gfx12-plus

S_WAIT_ASYNCCNT was missing from counterTypeForInstr(), so
isWaitInstr() did not recognize it as a wait instruction. On the
fixpoint algorithm's second pass over a loop body, the already-inserted
S_WAIT_ASYNCCNT was treated as a normal instruction, causing
WAIT_ASYNCMARK to be re-processed and a duplicate S_WAIT_ASYNCCNT to
be emitted.

Assisted-By: Claude Opus 4.6



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