test/CodeGen/AMDGPU/fold-restore-undef-use.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx90a -stress-regalloc=4 -verify-regalloc -start-before=greedy,0 -stop-after=virtregrewriter,0 %s -o - | FileCheck %s

# Check that we don't generate *** Bad machine code: Instruction loads
# from dead spill slot ***


---
name:            restore_undef_copy_use
tracksRegLiveness: true
machineFunctionInfo:
  maxKernArgAlign: 1
  isEntryFunction: true
  scratchRSrcReg:  '$sgpr0_sgpr1_sgpr2_sgpr3'
  stackPtrOffsetReg: '$sgpr32'
  occupancy:       8
body:             |
  ; CHECK-LABEL: name: restore_undef_copy_use
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.3(0x40000000), %bb.1(0x40000000)
  ; CHECK-NEXT:   liveins: $sgpr14, $sgpr15, $sgpr16, $vgpr0, $sgpr4_sgpr5, $sgpr6_sgpr7, $sgpr8_sgpr9, $sgpr10_sgpr11
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_CBRANCH_EXECZ %bb.3, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.5(0x40000000), %bb.2(0x40000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   renamable $sgpr4_sgpr5 = S_OR_SAVEEXEC_B64 undef renamable $sgpr4_sgpr5, implicit-def $exec, implicit-def $scc, implicit $exec
  ; CHECK-NEXT:   $exec = S_XOR_B64_term $exec, killed renamable $sgpr4_sgpr5, implicit-def $scc
  ; CHECK-NEXT:   S_CBRANCH_EXECZ %bb.5, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   successors: %bb.5(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   ADJCALLSTACKUP 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
  ; CHECK-NEXT:   $sgpr6_sgpr7 = KILL undef renamable $sgpr6_sgpr7
  ; CHECK-NEXT:   dead $sgpr30_sgpr31 = SI_CALL undef renamable $sgpr4_sgpr5, 0, csr_amdgpu_gfx90ainsts, implicit $sgpr6_sgpr7, implicit $sgpr0_sgpr1_sgpr2_sgpr3
  ; CHECK-NEXT:   ADJCALLSTACKDOWN 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
  ; CHECK-NEXT:   S_BRANCH %bb.5
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.3:
  ; CHECK-NEXT:   successors: %bb.4(0x80000000)
  ; CHECK-NEXT:   liveins: $sgpr10_sgpr11
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   SI_SPILL_S64_SAVE killed renamable $sgpr10_sgpr11, %stack.0, implicit $exec, implicit $sgpr32 :: (store (s64) into %stack.0, align 4, addrspace 5)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.4:
  ; CHECK-NEXT:   successors: %bb.5(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   ADJCALLSTACKUP 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
  ; CHECK-NEXT:   dead $sgpr30_sgpr31 = SI_CALL undef renamable $sgpr4_sgpr5, 0, csr_amdgpu_gfx90ainsts, implicit $sgpr0_sgpr1_sgpr2_sgpr3
  ; CHECK-NEXT:   ADJCALLSTACKDOWN 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
  ; CHECK-NEXT:   ADJCALLSTACKUP 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
  ; CHECK-NEXT:   $sgpr4_sgpr5 = SI_SPILL_S64_RESTORE %stack.0, implicit $exec, implicit $sgpr32 :: (load (s64) from %stack.0, align 4, addrspace 5)
  ; CHECK-NEXT:   dead $sgpr30_sgpr31 = SI_CALL undef renamable $sgpr4_sgpr5, 0, csr_amdgpu_gfx90ainsts, implicit $sgpr4_sgpr5
  ; CHECK-NEXT:   ADJCALLSTACKDOWN 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.5:
  bb.0:
    liveins: $vgpr0, $sgpr4_sgpr5, $sgpr6_sgpr7, $sgpr8_sgpr9, $sgpr10_sgpr11, $sgpr14, $sgpr15, $sgpr16

    %0:sgpr_64 = COPY $sgpr10_sgpr11
    S_CBRANCH_EXECZ %bb.3, implicit $exec

  bb.1:
    %1:sreg_64 = S_OR_SAVEEXEC_B64 undef %2:sreg_64, implicit-def $exec, implicit-def $scc, implicit $exec
    $exec = S_XOR_B64_term $exec, %1, implicit-def $scc
    S_CBRANCH_EXECZ %bb.5, implicit $exec

  bb.2:
    ADJCALLSTACKUP 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
    ; A restore for %0 should not be inserted here.
    $sgpr6_sgpr7 = COPY undef %0
    dead $sgpr30_sgpr31 = SI_CALL undef %1, 0, csr_amdgpu_gfx90ainsts, implicit $sgpr6_sgpr7, implicit $sgpr0_sgpr1_sgpr2_sgpr3
    ADJCALLSTACKDOWN 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
    S_BRANCH %bb.5

  bb.3:

  bb.4:
    ADJCALLSTACKUP 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
    dead $sgpr30_sgpr31 = SI_CALL undef %3:sreg_64_xexec, 0, csr_amdgpu_gfx90ainsts, implicit $sgpr0_sgpr1_sgpr2_sgpr3
    ADJCALLSTACKDOWN 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
    ADJCALLSTACKUP 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32
    $sgpr4_sgpr5 = COPY %0
    dead $sgpr30_sgpr31 = SI_CALL undef %3:sreg_64_xexec, 0, csr_amdgpu_gfx90ainsts, implicit $sgpr4_sgpr5
    ADJCALLSTACKDOWN 0, 0, implicit-def dead $scc, implicit-def $sgpr32, implicit $sgpr32

  bb.5:

...