llvm-project/llvm/test/CodeGen/AMDGPU/waitcnt-back-edge-loop.mir

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

# GCN-LABEL: waitcnt-back-edge-loop
# GCN: bb.2
# GCN: S_WAITCNT 112
# GCN: $vgpr5 = V_CVT_I32_F32_e32 killed $vgpr5, implicit $exec

---
name: waitcnt-back-edge-loop
body:             |
  bb.0:
    successors: %bb.1

    $vgpr1 = V_MOV_B32_e32 0, implicit $exec, implicit-def $vgpr1_vgpr2
    $vgpr2 = V_MOV_B32_e32 0, implicit $exec, implicit-def $vgpr1_vgpr2
    $vgpr4 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, 0, 0, implicit $exec, implicit $flat_scr :: (volatile load 4 from `float addrspace(1)* null`, addrspace 1)
    $vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, 0, 0, implicit $exec, implicit $flat_scr :: (volatile load 4 from `float addrspace(1)* null`, addrspace 1)
    $sgpr0_sgpr1 = V_CMP_EQ_U32_e64 3, killed $sgpr4, implicit $exec
    $vgpr3 = V_CNDMASK_B32_e64 0, -1082130432, 0, 1065353216, killed $sgpr0_sgpr1, implicit $exec
    $vgpr5 = V_MOV_B32_e32 $vgpr0, implicit $exec, implicit $exec
    S_BRANCH %bb.1

  bb.3:
    successors: %bb.1

    $vgpr5 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, 0, 0, implicit $exec, implicit $flat_scr :: (volatile load 4 from `float addrspace(1)* null`, addrspace 1)

  bb.1:
    successors: %bb.5, %bb.2

    $vgpr5 = V_CVT_I32_F32_e32 killed $vgpr5, implicit $exec
    V_CMP_NE_U32_e32 0, $vgpr5, implicit-def $vcc, implicit $exec
    $vcc = S_AND_B64 $exec, killed $vcc, implicit-def dead $scc
    S_CBRANCH_VCCZ %bb.5, implicit killed $vcc

  bb.2:
    successors: %bb.4, %bb.3

    V_CMP_EQ_U32_e32 9, killed $vgpr5, implicit-def $vcc, implicit $exec
    $vcc = S_AND_B64 $exec, killed $vcc, implicit-def dead $scc
    S_CBRANCH_VCCZ %bb.3, implicit killed $vcc

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

    $vgpr5 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, 0, 0, implicit $exec, implicit $flat_scr :: (volatile load 4 from `float addrspace(1)* null`, addrspace 1)
    $vgpr4 = V_CVT_I32_F32_e32 $vgpr5, implicit $exec
    V_CMP_EQ_U32_e32 2, killed $vgpr4, implicit-def $vcc, implicit $exec
    $vcc = S_AND_B64 $exec, killed $vcc, implicit-def dead $scc
    $vgpr4 = V_MOV_B32_e32 $vgpr5, implicit $exec, implicit $exec
    S_CBRANCH_VCCZ %bb.1, implicit killed $vcc
    S_BRANCH %bb.3

  bb.5:

    $vgpr4 = V_MAC_F32_e32 killed $vgpr0, killed $vgpr3, killed $vgpr4, implicit $exec
    EXP_DONE 12, killed $vgpr4, undef $vgpr0, undef $vgpr0, undef $vgpr0, 0, 0, 15, implicit $exec
    S_ENDPGM 0
...
---

# GCN-LABEL: name: waitcnt-multiple-back-edges{{$}}
# GCN: bb.0:
# GCN: S_WAITCNT 0
# GCN-NEXT: S_BRANCH %bb.2

name: waitcnt-multiple-back-edges
body: |
  bb.0:
    S_BRANCH %bb.2

  bb.1:
    S_BRANCH %bb.2

  bb.2:
    S_CBRANCH_VCCZ %bb.1, implicit $vcc

  bb.3:
    S_CBRANCH_VCCNZ %bb.5, implicit $vcc

  bb.4:
    BUFFER_ATOMIC_ADD_OFFSET renamable $vgpr0, renamable $sgpr12_sgpr13_sgpr14_sgpr15, 0, 4, 0, implicit $exec
    S_CBRANCH_SCC0 %bb.2, implicit $scc
    S_BRANCH %bb.6

  bb.5:
    S_CBRANCH_SCC0 %bb.2, implicit $scc
    S_BRANCH %bb.6

  bb.6:
    S_CBRANCH_SCC1 %bb.0, implicit $scc
    S_ENDPGM 0
...