mirror of
https://github.com/RPCSX/llvm.git
synced 2024-11-24 04:09:45 +00:00
6649090b22
When we forward a stored value to a load and eliminate it entirely we need to make sure the liveness of the register is maintained all the way to its use. Previously we only cleared liveness on the store doing the forwarding, but there could be other killing uses in between. We already do the right thing when the load has to be converted into something else, it was just this one path that skipped it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306318 91177308-0d34-0410-b5e6-96231b3b80d8
184 lines
4.5 KiB
YAML
184 lines
4.5 KiB
YAML
# RUN: llc -mtriple=aarch64--linux-gnu -run-pass=aarch64-ldst-opt %s -verify-machineinstrs -o - | FileCheck %s
|
|
---
|
|
name: promote-load-from-store
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0:
|
|
liveins: %w1, %x0, %lr
|
|
|
|
STRWui killed %w1, %x0, 0 :: (store 4)
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
%w0 = LDRHHui killed %x0, 1 :: (load 2)
|
|
RET %lr, implicit %w0
|
|
|
|
...
|
|
# Don't count transient instructions towards search limits.
|
|
# CHECK-LABEL: name: promote-load-from-store
|
|
# CHECK: STRWui %w1
|
|
# CHECK: UBFMWri killed %w1
|
|
---
|
|
name: store-pair
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0:
|
|
liveins: %w1, %x0, %lr
|
|
|
|
STRWui %w1, %x0, 0 :: (store 4)
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
CFI_INSTRUCTION 0
|
|
STRWui killed %w1, killed %x0, 1 :: (store 4)
|
|
RET %lr
|
|
|
|
...
|
|
# CHECK-LABEL: name: store-pair
|
|
# CHECK: STPWi
|
|
---
|
|
name: store-pair-clearkill0
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0:
|
|
liveins: %w1, %x0, %lr
|
|
|
|
STRWui %w1, %x0, 0 :: (store 4)
|
|
%w2 = COPY %w1
|
|
%x3 = COPY %x0
|
|
STRWui killed %w1, killed %x0, 1 :: (store 4)
|
|
RET %lr
|
|
...
|
|
# When merging a lower store with an upper one, we must clear kill flags on
|
|
# the lower store.
|
|
# CHECK-LABEL: store-pair-clearkill0
|
|
# CHECK-NOT: STPWi %w1, killed %w1, %x0, 0 :: (store 4)
|
|
# CHECK: STPWi %w1, %w1, %x0, 0 :: (store 4)
|
|
# CHECK: %w2 = COPY %w1
|
|
# CHECK: RET %lr
|
|
---
|
|
name: store-pair-clearkill1
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0:
|
|
liveins: %x0, %lr
|
|
|
|
%w1 = MOVi32imm 13
|
|
%w2 = MOVi32imm 7
|
|
STRWui %w1, %x0, 1 :: (store 4)
|
|
%w2 = COPY killed %w1
|
|
STRWui killed %w2, %x0, 0 :: (store 4)
|
|
|
|
%w1 = MOVi32imm 42
|
|
%w2 = MOVi32imm 7
|
|
STRWui %w1, %x0, 0 :: (store 4)
|
|
%w2 = COPY killed %w1
|
|
STRWui killed %w2, killed %x0, 1 :: (store 4)
|
|
|
|
RET %lr
|
|
...
|
|
# When merging an upper store with a lower one, kill flags along the way need
|
|
# to be removed; In this case the kill flag on %w1.
|
|
# CHECK-LABEL: store-pair-clearkill1
|
|
# CHECK: %w1 = MOVi32imm
|
|
# CHECK: %w2 = MOVi32imm
|
|
# CHECK-NOT: %w2 = COPY killed %w1
|
|
# CHECK: %w2 = COPY %w1
|
|
# CHECK: STPWi killed %w2, %w1, %x0, 0
|
|
|
|
# CHECK: %w1 = MOVi32imm
|
|
# CHECK: %w2 = MOVi32imm
|
|
# CHECK-NOT: %w2 = COPY killed %w1
|
|
# CHECK: %w2 = COPY %w1
|
|
# CHECK: STPWi %w1, killed %w2, killed %x0, 0
|
|
---
|
|
name: store-load-clearkill
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0:
|
|
liveins: %w1
|
|
|
|
STRWui %w1, %sp, 0 :: (store 4)
|
|
%wzr = COPY killed %w1 ; killing use of %w1
|
|
%w11 = LDRWui %sp, 0 :: (load 4)
|
|
HINT 0, implicit %w11 ; some use of %w11
|
|
...
|
|
# When replaceing the load of a store-load pair with a copy the kill flags
|
|
# along the way need to be cleared.
|
|
# CHECK-LABEL: name: store-load-clearkill
|
|
# CHECK: STRWui %w1, %sp, 0 :: (store 4)
|
|
# CHECK-NOT: COPY killed %w1
|
|
# CHECK: %wzr = COPY %w1
|
|
# CHECK: %w11 = ORRWrs %wzr, %w1, 0
|
|
# CHECK: HINT 0, implicit %w11
|
|
---
|
|
name: promote-load-from-store-undef
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0:
|
|
liveins: %x0, %x2, %lr
|
|
|
|
STRWui undef %w1, %x0, 0 :: (store 4)
|
|
%w0 = LDRBBui %x0, 1 :: (load 2)
|
|
STRHHui undef %w3, %x2, 0 :: (store 4)
|
|
%w1 = LDRBBui %x2, 0 :: (load 4)
|
|
RET %lr, implicit %w0
|
|
...
|
|
# CHECK-LABEL: name: promote-load-from-store-undef
|
|
# CHECK: STRWui undef %w1
|
|
# CHECK: UBFMWri undef %w1
|
|
# CHECK: STRHHui undef %w3
|
|
# CHECK: ANDWri undef %w3
|
|
---
|
|
name: promote-load-from-store-trivial-kills
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0:
|
|
liveins: %x0, %lr
|
|
|
|
STRXui %x0, %sp, 0 :: (store 8)
|
|
STRXui killed %x0, %sp, 2 :: (store 8)
|
|
%x0 = LDRXui %sp, 0 :: (load 8)
|
|
BL $bar, csr_aarch64_aapcs, implicit-def %lr, implicit %sp, implicit %x0, implicit-def %sp
|
|
RET %lr
|
|
...
|
|
# CHECK-LABEL: name: promote-load-from-store-trivial-kills
|
|
# CHECK: STRXui %x0, %sp, 0
|
|
# CHECK: STRXui %x0, %sp, 2
|
|
# CHECK-NOT: LDRXui
|
|
# CHECK-NOT: ORR
|
|
# CHECK: BL $bar, csr_aarch64_aapcs, implicit-def %lr, implicit %sp, implicit %x0, implicit-def %sp
|