| # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py |
| # RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -run-pass=greedy -o - %s | FileCheck %s |
| |
| # This testcase is restricted to use a maximum of 24 VGPRs. It is |
| # therefore possible to allocate a maximum of 3 vreg_256s at a |
| # time. The apparent number of registers in the class is larger, but |
| # each one overlaps with the next. Allocating a vreg_64 will prevent a |
| # full vreg_256 from being live at a given point. |
| |
| # The hints are trying to force allocation of overlapping vreg_256s |
| # which cannot be satisfied. The last S_NOP in %bb.0 with 2 vreg_256s |
| # and a vreg_64 use can be satisfied as long as the hints are ignored. |
| |
| # With the resulting allocation order, this ends up using last chance |
| # recoloring for a vreg_256. We should try to recolor for completed |
| # virtual registers with the same class, since the existing assignment |
| # can only be corrected by adjusting to a non-overlapping register. |
| |
| --- | |
| define void @recolor_impossible_hint() #0 { |
| ret void |
| } |
| |
| attributes #0 = { "amdgpu-waves-per-eu"="10,10" } |
| --- |
| |
| --- |
| name: recolor_impossible_hint |
| alignment: 1 |
| tracksRegLiveness: true |
| registers: |
| - { id: 0, class: vreg_256, preferred-register: '$vgpr0_vgpr1_vgpr2_vgpr3_vgpr4_vgpr5_vgpr6_vgpr7' } |
| - { id: 1, class: vreg_256, preferred-register: '$vgpr1_vgpr2_vgpr3_vgpr4_vgpr5_vgpr6_vgpr7_vgpr8' } |
| - { id: 2, class: vreg_256, preferred-register: '$vgpr2_vgpr3_vgpr4_vgpr5_vgpr6_vgpr7_vgpr8_vgpr9' } |
| - { id: 3, class: vreg_256, preferred-register: '$vgpr3_vgpr4_vgpr5_vgpr6_vgpr7_vgpr8_vgpr9_vgpr10' } |
| machineFunctionInfo: |
| scratchRSrcReg: '$sgpr0_sgpr1_sgpr2_sgpr3' |
| stackPtrOffsetReg: '$sgpr32' |
| occupancy: 10 |
| body: | |
| ; CHECK-LABEL: name: recolor_impossible_hint |
| ; CHECK: bb.0: |
| ; CHECK-NEXT: successors: %bb.2(0x40000000), %bb.1(0x40000000) |
| ; CHECK-NEXT: {{ $}} |
| ; CHECK-NEXT: S_NOP 0, implicit-def %7, implicit-def %19, implicit-def %5 |
| ; CHECK-NEXT: SI_SPILL_V256_SAVE %19, %stack.3, $sgpr32, 0, implicit $exec :: (store (s256) into %stack.3, align 4, addrspace 5) |
| ; CHECK-NEXT: SI_SPILL_V256_SAVE %7, %stack.1, $sgpr32, 0, implicit $exec :: (store (s256) into %stack.1, align 4, addrspace 5) |
| ; CHECK-NEXT: SI_SPILL_V256_SAVE %5, %stack.0, $sgpr32, 0, implicit $exec :: (store (s256) into %stack.0, align 4, addrspace 5) |
| ; CHECK-NEXT: S_NOP 0, implicit-def %17 |
| ; CHECK-NEXT: SI_SPILL_V256_SAVE %17, %stack.2, $sgpr32, 0, implicit $exec :: (store (s256) into %stack.2, align 4, addrspace 5) |
| ; CHECK-NEXT: S_NOP 0, implicit-def %4 |
| ; CHECK-NEXT: [[SI_SPILL_V256_RESTORE:%[0-9]+]]:vreg_256 = SI_SPILL_V256_RESTORE %stack.1, $sgpr32, 0, implicit $exec :: (load (s256) from %stack.1, align 4, addrspace 5) |
| ; CHECK-NEXT: [[SI_SPILL_V256_RESTORE1:%[0-9]+]]:vreg_256 = SI_SPILL_V256_RESTORE %stack.3, $sgpr32, 0, implicit $exec :: (load (s256) from %stack.3, align 4, addrspace 5) |
| ; CHECK-NEXT: S_NOP 0, implicit [[SI_SPILL_V256_RESTORE]], implicit [[SI_SPILL_V256_RESTORE1]], implicit %4 |
| ; CHECK-NEXT: [[COPY:%[0-9]+]]:vreg_256 = COPY [[SI_SPILL_V256_RESTORE1]] |
| ; CHECK-NEXT: S_CBRANCH_EXECNZ %bb.2, implicit $exec |
| ; CHECK-NEXT: {{ $}} |
| ; CHECK-NEXT: bb.1: |
| ; CHECK-NEXT: successors: %bb.2(0x80000000) |
| ; CHECK-NEXT: {{ $}} |
| ; CHECK-NEXT: S_NOP 0, implicit [[COPY]] |
| ; CHECK-NEXT: [[SI_SPILL_V256_RESTORE2:%[0-9]+]]:vreg_256 = SI_SPILL_V256_RESTORE %stack.0, $sgpr32, 0, implicit $exec :: (load (s256) from %stack.0, align 4, addrspace 5) |
| ; CHECK-NEXT: S_NOP 0, implicit [[SI_SPILL_V256_RESTORE2]] |
| ; CHECK-NEXT: [[SI_SPILL_V256_RESTORE3:%[0-9]+]]:vreg_256 = SI_SPILL_V256_RESTORE %stack.2, $sgpr32, 0, implicit $exec :: (load (s256) from %stack.2, align 4, addrspace 5) |
| ; CHECK-NEXT: S_NOP 0, implicit [[SI_SPILL_V256_RESTORE3]] |
| ; CHECK-NEXT: {{ $}} |
| ; CHECK-NEXT: bb.2: |
| ; CHECK-NEXT: S_ENDPGM 0 |
| bb.0: |
| S_NOP 0, implicit-def %0:vreg_256, implicit-def %1:vreg_256, implicit-def %2:vreg_256 |
| S_NOP 0, implicit-def %3:vreg_256 |
| S_NOP 0, implicit-def %4:vreg_64 |
| S_NOP 0, implicit %0, implicit %1, implicit %4 |
| S_CBRANCH_EXECNZ %bb.3, implicit $exec |
| |
| bb.2: |
| S_NOP 0, implicit %1 |
| S_NOP 0, implicit %2 |
| S_NOP 0, implicit %3 |
| |
| bb.3: |
| S_ENDPGM 0 |
| |
| ... |