# RUN: llc -mtriple=amdgcn -mcpu=gfx803 -run-pass si-insert-waitcnts %s -o - | FileCheck -check-prefixes=CHECK,GFX89 %s
# RUN: llc -mtriple=amdgcn -mcpu=gfx900 -run-pass si-insert-waitcnts %s -o - | FileCheck -check-prefixes=CHECK,GFX89 %s
--- |
define amdgpu_kernel void @flat_zero_waitcnt(ptr addrspace(1) %global4,
ptr addrspace(1) %global16,
ptr %flat4,
ptr %flat16) {
ret void
}
define amdgpu_kernel void @single_fallthrough_successor_no_end_block_wait() {
ret void
}
define amdgpu_kernel void @single_branch_successor_not_next_block() {
ret void
}
define amdgpu_kernel void @preexisting_waitcnt() {
ret void
}
define amdgpu_kernel void @bundle_no_waitcnt() {
ret void
}
define amdgpu_kernel void @preexisting_waitcnt_in_bundle() {
ret void
}
define amdgpu_kernel void @insert_in_bundle() {
ret void
}
define amdgpu_kernel void @exit_bundle() {
ret void
}
define amdgpu_kernel void @cross_bundle() {
ret void
}
define amdgpu_kernel void @subregs16bit() {
ret void
}
define amdgpu_kernel void @waitcnt_backedge() {
ret void
}
...
---
# CHECK-LABEL: name: flat_zero_waitcnt
# CHECK-LABEL: bb.0:
# CHECK: FLAT_LOAD_DWORD
# CHECK: FLAT_LOAD_DWORDX4
# Global loads will return in order so we should:
# s_waitcnt vmcnt(1)
# CHECK-NEXT: S_WAITCNT 3953
# CHECK-LABEL: bb.1:
# CHECK: FLAT_LOAD_DWORD
# s_waitcnt vmcnt(0)
# GFX89: S_WAITCNT 3952
# CHECK: FLAT_LOAD_DWORDX4
# CHECK-LABEL: bb.2:
# CHECK: FLAT_LOAD_DWORD
# s_waitcnt vmcnt(0)
# GFX89: S_WAITCNT 3952
# CHECK: FLAT_LOAD_DWORDX4
# CHECK-LABEL: bb.3:
# s_waitcnt vmcnt(0)
# GFX89: S_WAITCNT 3952
# CHECK: FLAT_LOAD_DWORD
# CHECK: FLAT_LOAD_DWORD
# s_waitcnt vmcnt(0) lgkmcnt(0)
# GFX89: S_WAITCNT 112
# CHECK-LABEL: bb.4:
# GFX89-NOT: S_WAITCNT
# CHECK: FLAT_LOAD_DWORD
# s_waitcnt vmcnt(0) lgkmcnt(0)
# GFX89: S_WAITCNT 112
name: flat_zero_waitcnt
body: |
bb.0:
successors: %bb.1
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32) from %ir.global4)
$vgpr3_vgpr4_vgpr5_vgpr6 = FLAT_LOAD_DWORDX4 $vgpr7_vgpr8, 0, 0, implicit $exec, implicit $flat_scr :: (load (s128) from %ir.global16)
$vgpr0 = V_MOV_B32_e32 $vgpr1, implicit $exec
S_BRANCH %bb.1
bb.1:
successors: %bb.2
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
$vgpr3_vgpr4_vgpr5_vgpr6 = FLAT_LOAD_DWORDX4 $vgpr7_vgpr8, 0, 0, implicit $exec, implicit $flat_scr :: (load (s128) from %ir.global16)
$vgpr0 = V_MOV_B32_e32 $vgpr1, implicit $exec
S_BRANCH %bb.2
bb.2:
successors: %bb.3
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32) from %ir.flat4)
$vgpr3_vgpr4_vgpr5_vgpr6 = FLAT_LOAD_DWORDX4 $vgpr7_vgpr8, 0, 0, implicit $exec, implicit $flat_scr :: (load (s128) from %ir.flat16)
$vgpr0 = V_MOV_B32_e32 $vgpr1, implicit $exec
S_BRANCH %bb.3
bb.3:
successors: %bb.4
$vgpr3 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32) from %ir.flat4)
$vgpr4 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32) from %ir.global4)
$vgpr0 = V_MOV_B32_e32 $vgpr3, implicit $exec
S_BRANCH %bb.4
bb.4:
$vgpr5 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32) from %ir.flat4)
$vgpr0 = V_MOV_B32_e32 $vgpr5, implicit $exec
S_ENDPGM 0
...
---
# There is only a single fallthrough successor block, so there's no
# need to wait immediately.
# CHECK-LABEL: name: single_fallthrough_successor_no_end_block_wait
# CHECK: $vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2
# CHECK-NOT: S_WAITCNT
# CHECK: bb.1:
# CHECK-NEXT: V_LSHLREV_B64_e64
# CHECK-NEXT: S_WAITCNT 112
# CHECK-NEXT: FLAT_STORE_DWORD
name: single_fallthrough_successor_no_end_block_wait
body: |
bb.0:
successors: %bb.1
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
bb.1:
$vgpr3_vgpr4 = V_LSHLREV_B64_e64 4, $vgpr7_vgpr8, implicit $exec
FLAT_STORE_DWORD $vgpr3_vgpr4, $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
S_ENDPGM 0
...
---
# The block has a single predecessor with a single successor, but it
# is not the next block so it's non-obvious that the wait is not needed.
# CHECK-LABEL: name: single_branch_successor_not_next_block
# CHECK: bb.1
# CHECK-NEXT: FLAT_STORE_DWORD
# CHECK-NEXT: S_ENDPGM 0
# CHECK: bb.2:
# CHECK-NEXT: V_LSHLREV_B64_e64
# CHECK-NEXT: S_WAITCNT 112
# CHECK-NEXT: FLAT_STORE_DWORD
name: single_branch_successor_not_next_block
body: |
bb.0:
successors: %bb.2
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
S_BRANCH %bb.2
bb.1:
FLAT_STORE_DWORD $vgpr8_vgpr9, $vgpr10, 0, 0, implicit $exec, implicit $flat_scr
S_ENDPGM 0
bb.2:
$vgpr3_vgpr4 = V_LSHLREV_B64_e64 4, $vgpr7_vgpr8, implicit $exec
FLAT_STORE_DWORD $vgpr3_vgpr4, $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
S_ENDPGM 0
...
# CHECK-LABEL: name: preexisting_waitcnt{{$}}
# CHECK: FLAT_LOAD_DWORD
# CHECK-NEXT: S_WAITCNT 0
# CHECK-NOT: S_WAITCNT
name: preexisting_waitcnt
tracksRegLiveness: true
machineFunctionInfo:
isEntryFunction: true
body: |
bb.0:
liveins: $vgpr1_vgpr2
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
S_WAITCNT 0
FLAT_STORE_DWORD $vgpr1_vgpr2, $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
...
---
# CHECK-LABEL: name: bundle_no_waitcnt{{$}}
# CHECK: FLAT_LOAD_DWORD
# CHECK-NEXT: BUNDLE
# CHECK-NEXT: S_NOP
# CHECK-NEXT: S_NOP
# CHECK-NEXT: }
# CHECK-NEXT: S_WAITCNT 112
name: bundle_no_waitcnt
tracksRegLiveness: true
machineFunctionInfo:
isEntryFunction: true
body: |
bb.0:
liveins: $vgpr1_vgpr2
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
BUNDLE {
S_NOP 0
S_NOP 0
}
FLAT_STORE_DWORD $vgpr1_vgpr2, $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
...
---
# See the waitcnt inside the bundle and don't insert an extra
# CHECK-LABEL: name: preexisting_waitcnt_in_bundle{{$}}
# CHECK: FLAT_LOAD_DWORD
# CHECK: S_WAITCNT 0
# CHECK-NOT: S_WAITCNT
name: preexisting_waitcnt_in_bundle
tracksRegLiveness: true
machineFunctionInfo:
isEntryFunction: true
body: |
bb.0:
liveins: $vgpr1_vgpr2
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
BUNDLE {
S_NOP 0
S_WAITCNT 0
}
FLAT_STORE_DWORD $vgpr1_vgpr2, $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
...
---
# Def and use inside bundle
# CHECK-LABEL: name: insert_in_bundle{{$}}
# CHECK: BUNDLE implicit-def $vgpr0, implicit $vgpr1_vgpr2 {
# CHECK-NEXT: $vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
# CHECK-NEXT: S_WAITCNT 112
# CHECK-NEXT: FLAT_STORE_DWORD $vgpr1_vgpr2, internal $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
# CHECK-NEXT: }
name: insert_in_bundle
tracksRegLiveness: true
machineFunctionInfo:
isEntryFunction: true
body: |
bb.0:
liveins: $vgpr1_vgpr2
BUNDLE implicit-def $vgpr0, implicit $vgpr1_vgpr2 {
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
FLAT_STORE_DWORD $vgpr1_vgpr2, internal $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
}
...
---
# Def is last instruction in bundle, use is outside bundle
# CHECK-LABEL: name: exit_bundle{{$}}
# CHECK: BUNDLE implicit-def $vgpr0, implicit $vgpr1_vgpr2 {
# CHECK-NEXT: $vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
# CHECK-NEXT: }
# CHECK-NEXT: S_WAITCNT 112
# CHECK-NEXT: FLAT_STORE_DWORD $vgpr1_vgpr2, $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
name: exit_bundle
tracksRegLiveness: true
machineFunctionInfo:
isEntryFunction: true
body: |
bb.0:
liveins: $vgpr1_vgpr2
BUNDLE implicit-def $vgpr0, implicit $vgpr1_vgpr2 {
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
}
FLAT_STORE_DWORD $vgpr1_vgpr2, $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
...
---
# Def is in bundle, use is in another bundle
# CHECK-LABEL: name: cross_bundle{{$}}
# CHECK: BUNDLE implicit-def $vgpr0, implicit $vgpr1_vgpr2 {
# CHECK-NEXT: $vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
# CHECK-NEXT: }
# CHECK-NEXT: BUNDLE implicit $vgpr0, implicit $vgpr1_vgpr2 {
# CHECK-NEXT: S_WAITCNT 112
# CHECK-NEXT: FLAT_STORE_DWORD $vgpr1_vgpr2, $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
# CHECK-NEXT: }
name: cross_bundle
tracksRegLiveness: true
machineFunctionInfo:
isEntryFunction: true
body: |
bb.0:
liveins: $vgpr1_vgpr2
BUNDLE implicit-def $vgpr0, implicit $vgpr1_vgpr2 {
$vgpr0 = FLAT_LOAD_DWORD $vgpr1_vgpr2, 0, 0, implicit $exec, implicit $flat_scr
}
BUNDLE implicit $vgpr0, implicit $vgpr1_vgpr2 {
FLAT_STORE_DWORD $vgpr1_vgpr2, $vgpr0, 0, 0, implicit $exec, implicit $flat_scr
}
...
---
# CHECK-LABEL: name: subregs16bit
# CHECK: S_WAITCNT 112
# CHECK-NEXT: V_NOP_e32
name: subregs16bit
machineFunctionInfo:
isEntryFunction: true
body: |
bb.0:
liveins: $vgpr0_vgpr1, $vgpr2_vgpr3, $vgpr4
$vgpr0 = FLAT_LOAD_USHORT killed $vgpr0_vgpr1, 0, 0, implicit $exec, implicit $flat_scr
$vgpr1 = FLAT_LOAD_USHORT killed $vgpr2_vgpr3, 0, 0, implicit $exec, implicit $flat_scr
V_NOP_e32 implicit $exec, implicit $vgpr0_lo16, implicit $vgpr1_lo16
...
---
# Waitcnt required before the use of $sgpr10_sgpr11, as the S_LOAD also writes
# to $sgpr10_sgpr11, and can occur first in the program running order.
# CHECK-LABEL: name: waitcnt_backedge
# CHECK: S_WAITCNT
# CHECK: $sgpr10_sgpr11 = S_CSELECT_B64
# CHECK: $sgpr10_sgpr11 = S_LOAD_DWORDX2_IMM
name: waitcnt_backedge
body: |
bb.0:
renamable $sgpr4_sgpr5_sgpr6_sgpr7 = S_LOAD_DWORDX4_IMM renamable $sgpr2_sgpr3, 32, 0 :: (load (s128) from `ptr addrspace(4) undef`, addrspace 4)
bb.4:
renamable $sgpr10_sgpr11 = S_CSELECT_B64 -1, 0, implicit killed $scc
renamable $vgpr1 = BUFFER_LOAD_DWORD_OFFEN killed renamable $vgpr5, renamable $sgpr4_sgpr5_sgpr6_sgpr7, 0, 0, 1, 0, implicit $exec :: (dereferenceable load (s32), align 1, addrspace 4)
renamable $sgpr10_sgpr11 = S_LOAD_DWORDX2_IMM killed renamable $sgpr0_sgpr1, 0, 0 :: (load (s64) from `ptr addrspace(4) undef`, align 4, addrspace 4)
S_CBRANCH_SCC0 %bb.9, implicit killed $scc
bb.9:
renamable $vgpr1 = V_CNDMASK_B32_e64 0, 0, 0, 1, killed $sgpr14_sgpr15, implicit $exec
S_CBRANCH_SCC0 %bb.14, implicit killed $scc
bb.10:
S_BRANCH %bb.4
bb.14:
S_ENDPGM 0
...
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