test/CodeGen/AMDGPU/waitcnt-loop-irreducible.mir

# RUN: llc -march=amdgcn -verify-machineinstrs -run-pass si-insert-waitcnts -o - %s | FileCheck -check-prefixes=GCN %s

# GCN-LABEL: name: irreducible_loop{{$}}
# GCN: S_LOAD_DWORDX4_IMM
# GCN: S_WAITCNT 127{{$}}
# GCN: S_BUFFER_LOAD_DWORD_IMM
# GCN: S_WAITCNT 127{{$}}
# GCN: S_CMP_GE_I32
--- |

  define amdgpu_ps void @irreducible_loop() {
  main:
    ret void
  }

...
---
name:            irreducible_loop
body:             |
  bb.0:
    successors: %bb.3, %bb.2

    S_CBRANCH_VCCZ %bb.2, implicit $vcc
    S_BRANCH %bb.3

  bb.1:
    successors: %bb.3, %bb.2

    S_CBRANCH_VCCNZ %bb.3, implicit $vcc

  bb.2:
    successors: %bb.3

    renamable $sgpr4_sgpr5_sgpr6_sgpr7 = S_LOAD_DWORDX4_IMM renamable $sgpr0_sgpr1, 0, 0
    renamable $sgpr3 = S_BUFFER_LOAD_DWORD_IMM killed renamable $sgpr4_sgpr5_sgpr6_sgpr7, 0, 0

  bb.3:
    successors: %bb.1, %bb.4

    S_CMP_GE_I32 renamable $sgpr2, renamable $sgpr3, implicit-def $scc
    S_CBRANCH_SCC0 %bb.1, implicit killed $scc

  bb.4:

    S_ENDPGM

...