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| # RUN: llc -o - %s -mtriple=amdgcn-- -mcpu=fiji -verify-machineinstrs -run-pass=greedy,virtregrewriter | FileCheck %s
--- |
define amdgpu_kernel void @func0() #0 { ret void }
define amdgpu_kernel void @func1() #0 { ret void }
define amdgpu_kernel void @splitHoist() #0 { ret void }
attributes #0 = { "amdgpu-num-sgpr"="12" }
...
---
# Make sure we only get a single spill+reload even if liverange splitting
# created a sequence of multiple copy instructions.
# CHECK-LABEL: name: func0
# CHECK: SI_SPILL_S128_SAVE
# CHECK-NOT: SI_SPILL_S128_SAVE
# CHECK: S_NOP 0
# CHECK: SI_SPILL_S128_RESTORE
# CHECK-NOT: SI_SPILL_S128_RESTORE
name: func0
body: |
bb.0:
S_NOP 0, implicit-def undef %0.sub0 : sgpr_128
S_NOP 0, implicit-def %0.sub3 : sgpr_128
; Clobber registers
S_NOP 0, implicit-def dead $sgpr0, implicit-def dead $sgpr1, implicit-def dead $sgpr2, implicit-def dead $sgpr3, implicit-def dead $sgpr4, implicit-def dead $sgpr5, implicit-def dead $sgpr6, implicit-def dead $sgpr7, implicit-def dead $sgpr8, implicit-def dead $sgpr9, implicit-def dead $sgpr10, implicit-def dead $sgpr11
S_NOP 0, implicit %0.sub0
S_NOP 0, implicit %0.sub3
S_NOP 0, implicit %0.sub0
S_NOP 0, implicit %0.sub3
...
---
# LiveRange splitting should split this into 2 intervals with the second getting
# allocated to sgpr0_sgpr1 and the first to something else so we see two copies
# in between for the two subregisters that are alive.
# CHECK-LABEL: name: func1
# CHECK: [[REG0:\$sgpr[0-9]+]] = COPY $sgpr0
# CHECK: [[REG1:\$sgpr[0-9]+]] = COPY $sgpr2
# CHECK: S_NOP 0
# CHECK: S_NOP 0, implicit renamable [[REG0]]
# CHECK: S_NOP 0, implicit renamable [[REG1]]
# CHECK: $sgpr0 = COPY renamable [[REG0]]
# CHECK: $sgpr2 = COPY renamable [[REG1]]
# CHECK: S_NOP
# CHECK: S_NOP 0, implicit renamable $sgpr0
# CHECK: S_NOP 0, implicit renamable $sgpr2
name: func1
tracksRegLiveness: true
body: |
bb.0:
liveins: $sgpr0, $sgpr1, $sgpr2
undef %0.sub0 : sgpr_128 = COPY $sgpr0
%0.sub2 = COPY $sgpr2
S_NOP 0, implicit-def dead $sgpr0, implicit-def dead $sgpr1
S_NOP 0, implicit %0.sub0
S_NOP 0, implicit %0.sub2
; Clobber everything but sgpr0-sgpr3
S_NOP 0, implicit-def dead $sgpr4, implicit-def dead $sgpr5, implicit-def dead $sgpr6, implicit-def dead $sgpr7, implicit-def dead $sgpr8, implicit-def dead $sgpr9, implicit-def dead $sgpr10, implicit-def dead $sgpr11, implicit-def dead $sgpr12, implicit-def dead $sgpr13, implicit-def dead $sgpr14, implicit-def dead $sgpr15, implicit-def dead $vcc_lo, implicit-def dead $vcc_hi
S_NOP 0, implicit %0.sub0
S_NOP 0, implicit %0.sub2
...
---
# Check that copy hoisting out of loops works. This mainly should not crash the
# compiler when it hoists a subreg copy sequence.
# CHECK-LABEL: name: splitHoist
# CHECK: S_NOP 0, implicit-def renamable $sgpr0
# CHECK: S_NOP 0, implicit-def renamable $sgpr3
# CHECK-NEXT: SI_SPILL_S128_SAVE
name: splitHoist
tracksRegLiveness: true
body: |
bb.0:
successors: %bb.1, %bb.2
S_NOP 0, implicit-def undef %0.sub0 : sgpr_128
S_NOP 0, implicit-def %0.sub3 : sgpr_128
S_CBRANCH_VCCNZ %bb.1, implicit undef $vcc
S_BRANCH %bb.2
bb.1:
successors: %bb.1, %bb.3
S_NOP 0, implicit %0.sub0
; Clobber registers
S_NOP 0, implicit-def dead $sgpr0, implicit-def dead $sgpr1, implicit-def dead $sgpr2, implicit-def dead $sgpr3, implicit-def dead $sgpr4, implicit-def dead $sgpr5, implicit-def dead $sgpr6, implicit-def dead $sgpr7, implicit-def dead $sgpr8, implicit-def dead $sgpr9, implicit-def dead $sgpr10, implicit-def dead $sgpr11
S_CBRANCH_VCCNZ %bb.1, implicit undef $vcc
S_BRANCH %bb.3
bb.2:
successors: %bb.3
; Clobber registers
S_NOP 0, implicit-def dead $sgpr0, implicit-def dead $sgpr1, implicit-def dead $sgpr2, implicit-def dead $sgpr3, implicit-def dead $sgpr4, implicit-def dead $sgpr5, implicit-def dead $sgpr6, implicit-def dead $sgpr7, implicit-def dead $sgpr8, implicit-def dead $sgpr9, implicit-def dead $sgpr10, implicit-def dead $sgpr11
S_BRANCH %bb.3
bb.3:
S_NOP 0, implicit %0.sub0
S_NOP 0, implicit %0.sub3
S_NOP 0, implicit %0.sub0
S_NOP 0, implicit %0.sub3
...
|