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llvm-project/llvm/test/CodeGen/AMDGPU/same-slot-agpr-sgpr.mir

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[AMDGPU] Don't remove VGPR to AGPR dead spills from frame info Removing dead frame indices for VGPR to AGPR spills is incorrect when the frame index is shared by multiple objects, which may occur due to stack slot coloring. The problem is that subsequent code that processes the other object will assert because the stack frame index is marked dead. Removing dead frame indices is needed prior to stack slot coloring, which is what happens with SGPR to VGPR spills. These spills are lowered prior to stack slot coloring, but the VGPR to AGPR spills are processed afterwards during the Prolog/Epilog Inserter pass. This patch marks the VGPR to AGPR spill slot as dead if the slot is not used by another object. Differential Revision: https://reviews.llvm.org/D115996
2021-12-19 05:01:50 +08:00
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx90a -verify-machineinstrs -run-pass=prologepilog -o - %s | FileCheck %s
---
name: same_slot_agpr_sgpr
tracksRegLiveness: true
stack:
- { id: 0, name: '', type: spill-slot, offset: 0, size: 8, alignment: 4 }
machineFunctionInfo:
hasSpilledVGPRs: true
scratchRSrcReg: $sgpr0_sgpr1_sgpr2_sgpr3
stackPtrOffsetReg: $sgpr32
body: |
bb.0:
; CHECK-LABEL: name: same_slot_agpr_sgpr
; CHECK: liveins: $agpr0, $agpr1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: $vgpr0 = IMPLICIT_DEF
; CHECK-NEXT: $agpr1 = V_ACCVGPR_WRITE_B32_e64 killed $vgpr0, implicit $exec
; CHECK-NEXT: $sgpr4_sgpr5 = IMPLICIT_DEF
; CHECK-NEXT: $sgpr6_sgpr7 = S_MOV_B64 $exec
; CHECK-NEXT: $exec = S_MOV_B64 3, implicit-def $vgpr0
; CHECK-NEXT: BUFFER_STORE_DWORD_OFFSET killed $vgpr0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr32, 8, 0, 0, 0, implicit $exec :: (store (s32) into %stack.1, addrspace 5)
; CHECK-NEXT: $vgpr0 = V_WRITELANE_B32 $sgpr4, 0, undef $vgpr0, implicit $sgpr4_sgpr5
; CHECK-NEXT: $vgpr0 = V_WRITELANE_B32 $sgpr5, 1, $vgpr0, implicit killed $sgpr4_sgpr5
; CHECK-NEXT: $agpr1 = V_ACCVGPR_WRITE_B32_e64 killed $vgpr0, implicit $exec
; CHECK-NEXT: $vgpr0 = BUFFER_LOAD_DWORD_OFFSET $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr32, 8, 0, 0, 0, implicit $exec :: (load (s32) from %stack.1, addrspace 5)
; CHECK-NEXT: $exec = S_MOV_B64 killed $sgpr6_sgpr7, implicit killed $vgpr0
; CHECK-NEXT: S_ENDPGM 0
$vgpr0 = IMPLICIT_DEF
SI_SPILL_AV32_SAVE killed $vgpr0, %stack.0, $sgpr32, 0, implicit $exec :: (store (s32) into %stack.0, addrspace 5)
$sgpr4_sgpr5 = IMPLICIT_DEF
SI_SPILL_S64_SAVE killed renamable $sgpr4_sgpr5, %stack.0, implicit $exec, implicit $sgpr32 :: (store (s64) into %stack.0, align 4, addrspace 5)
S_ENDPGM 0
...
---
name: diff_slot_agpr_sgpr
tracksRegLiveness: true
stack:
- { id: 0, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4 }
- { id: 1, name: '', type: spill-slot, offset: 0, size: 8, alignment: 4 }
machineFunctionInfo:
hasSpilledVGPRs: true
scratchRSrcReg: $sgpr0_sgpr1_sgpr2_sgpr3
stackPtrOffsetReg: $sgpr32
body: |
bb.0:
; CHECK-LABEL: name: diff_slot_agpr_sgpr
; CHECK: liveins: $agpr0
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: $vgpr0 = IMPLICIT_DEF
; CHECK-NEXT: $agpr0 = V_ACCVGPR_WRITE_B32_e64 killed $vgpr0, implicit $exec
; CHECK-NEXT: $sgpr4_sgpr5 = IMPLICIT_DEF
; CHECK-NEXT: $sgpr6_sgpr7 = S_MOV_B64 $exec
; CHECK-NEXT: $exec = S_MOV_B64 3, implicit-def $vgpr0
; CHECK-NEXT: BUFFER_STORE_DWORD_OFFSET killed $vgpr0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr32, 8, 0, 0, 0, implicit $exec :: (store (s32) into %stack.2, addrspace 5)
; CHECK-NEXT: $vgpr0 = V_WRITELANE_B32 $sgpr4, 0, undef $vgpr0, implicit $sgpr4_sgpr5
; CHECK-NEXT: $vgpr0 = V_WRITELANE_B32 $sgpr5, 1, $vgpr0, implicit killed $sgpr4_sgpr5
; CHECK-NEXT: BUFFER_STORE_DWORD_OFFSET killed $vgpr0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr32, 0, 0, 0, 0, implicit $exec :: (store (s32) into %stack.1, addrspace 5)
; CHECK-NEXT: $vgpr0 = BUFFER_LOAD_DWORD_OFFSET $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr32, 8, 0, 0, 0, implicit $exec :: (load (s32) from %stack.2, addrspace 5)
; CHECK-NEXT: $exec = S_MOV_B64 killed $sgpr6_sgpr7, implicit killed $vgpr0
; CHECK-NEXT: S_ENDPGM 0
$vgpr0 = IMPLICIT_DEF
SI_SPILL_AV32_SAVE killed $vgpr0, %stack.0, $sgpr32, 0, implicit $exec :: (store (s32) into %stack.0, addrspace 5)
$sgpr4_sgpr5 = IMPLICIT_DEF
SI_SPILL_S64_SAVE killed renamable $sgpr4_sgpr5, %stack.1, implicit $exec, implicit $sgpr32 :: (store (s64) into %stack.0, align 4, addrspace 5)
S_ENDPGM 0
...
---
name: dead_vgpr_slot
tracksRegLiveness: true
stack:
- { id: 0, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4 }
machineFunctionInfo:
hasSpilledVGPRs: true
stackPtrOffsetReg: $sgpr32
body: |
bb.0:
; CHECK-LABEL: name: dead_vgpr_slot
; CHECK: liveins: $agpr0
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: $vgpr0 = IMPLICIT_DEF
; CHECK-NEXT: $agpr0 = V_ACCVGPR_WRITE_B32_e64 killed $vgpr0, implicit $exec
; CHECK-NEXT: S_ENDPGM 0
$vgpr0 = IMPLICIT_DEF
SI_SPILL_AV32_SAVE killed $vgpr0, %stack.0, $sgpr32, 0, implicit $exec :: (store (s32) into %stack.0, addrspace 5)
S_ENDPGM 0
...