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# RUN: llc -mtriple=amdgcn -verify-machineinstrs -run-pass si-insert-waitcnts -o - %s | FileCheck %s
# Check that the waitcnt pass does *not* insert a redundant waitcnt instr.
# In this testcase, ensure that pass does not insert redundant S_WAITCNT 3952
...
# CHECK-LABEL: name: waitcnt-no-redundant
# CHECK: S_WAITCNT 3952
# CHECK-NEXT: FLAT_ATOMIC_CMPSWAP
# CHECK-NEXT: S_WAITCNT 3952
# CHECK-NEXT: BUFFER_WBINVL1
name: waitcnt-no-redundant
body: |
bb.0:
renamable $vgpr0 = V_MOV_B32_e32 0, implicit $exec
bb.1:
S_WAITCNT 3952
FLAT_ATOMIC_CMPSWAP undef renamable $vgpr0_vgpr1, renamable $vgpr0_vgpr1, 0, 0, implicit $exec, implicit $flat_scr
S_WAITCNT 3952
BUFFER_WBINVL1 implicit $exec
S_BRANCH %bb.1
...
# Check that the waitcnt pass does *not* insert a waitcnt inst after S_BUFFER_LOAD.
# WAR hazard does not apply here, because S_BUFFER_LOAD accesses invariant memory.
...
# CHECK-LABEL: name: waitcnt-no-war-wait
# CHECK: S_WAITCNT 0
# CHECK-NEXT: S_BUFFER_LOAD_DWORD_IMM
# CHECK-NEXT: TBUFFER_STORE_FORMAT_X_OFFEN_exact
name: waitcnt-no-war-wait
body: |
bb.0:
renamable $sgpr8 = S_BUFFER_LOAD_DWORD_IMM renamable $sgpr0_sgpr1_sgpr2_sgpr3, 276, 0 :: (dereferenceable invariant load (s32))
TBUFFER_STORE_FORMAT_X_OFFEN_exact killed renamable $vgpr0, renamable $vgpr15, renamable $sgpr4_sgpr5_sgpr6_sgpr7, renamable $sgpr9, 0, 116, 1, 0, implicit $exec :: (dereferenceable store (s32), align 1, addrspace 7)
...
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