third_party/llvm-7.0/llvm/test/CodeGen/AMDGPU/regcoalesce-dbg.mir

# RUN: llc -march=amdgcn -run-pass simple-register-coalescing -o - %s | FileCheck %s

# Test that register coalescing does not allow a call to
# LIS->getInstructionIndex with a DBG_VALUE instruction, which does not have
# a slot index.

# CHECK: %13.sub2:sgpr_128 = S_MOV_B32 0
# CHECK: DBG_VALUE{{.*}}debug-use %13.sub2

--- |
  define amdgpu_kernel void @test(i32 addrspace(1)* %out) { ret void }

  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !4, producer: "llvm", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !4)
  !1 = !DILocalVariable(name: "a", scope: !2, file: !4, line: 126, type: !6)
  !2 = distinct !DISubprogram(name: "test", scope: !4, file: !4, line: 1, type: !3, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !5)
  !3 = !DISubroutineType(types: !4)
  !4 = !{null}
  !5 = !{!1}
  !6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64, align: 32)
  !7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
  !8 = !DIExpression()
  !9 = !DILocation(line: 126, column: 9, scope: !2)

...
---
name:            test
tracksRegLiveness: true
registers:
  - { id: 0, class: sgpr_64 }
  - { id: 1, class: sreg_32_xm0 }
  - { id: 2, class: sgpr_32 }
  - { id: 3, class: vgpr_32 }
  - { id: 4, class: sreg_64_xexec }
  - { id: 5, class: sreg_32_xm0_xexec }
  - { id: 6, class: sreg_32 }
  - { id: 7, class: sreg_32 }
  - { id: 8, class: sreg_32_xm0 }
  - { id: 9, class: sreg_64 }
  - { id: 10, class: sreg_32_xm0 }
  - { id: 11, class: sreg_32_xm0 }
  - { id: 12, class: sgpr_64 }
  - { id: 13, class: sgpr_128 }
  - { id: 14, class: sreg_32_xm0 }
  - { id: 15, class: sreg_64 }
  - { id: 16, class: vgpr_32 }
  - { id: 17, class: vreg_64 }
  - { id: 18, class: vgpr_32 }
  - { id: 19, class: vreg_64 }
  - { id: 20, class: vreg_64 }
liveins:
  - { reg: '$sgpr0_sgpr1', virtual-reg: '%0' }
  - { reg: '$vgpr0', virtual-reg: '%3' }
body:             |
  bb.0:
    liveins: $sgpr0_sgpr1, $vgpr0

    %3 = COPY killed $vgpr0
    %0 = COPY killed $sgpr0_sgpr1
    %4 = S_LOAD_DWORDX2_IMM %0, 9, 0 :: (non-temporal dereferenceable invariant load 8 from `i64 addrspace(2)* undef`)
    %5 = S_LOAD_DWORD_IMM killed %0, 13, 0 :: (non-temporal dereferenceable invariant load 4 from `i32 addrspace(2)* undef`)
    %18 = V_ASHRREV_I32_e32 31, %3, implicit $exec
    undef %19.sub0 = COPY killed %3
    %19.sub1 = COPY killed %18
    %10 = S_MOV_B32 61440
    %11 = S_MOV_B32 0
    DBG_VALUE debug-use %11, debug-use $noreg, !1, !8, debug-location !9
    undef %12.sub0 = COPY killed %11
    %12.sub1 = COPY killed %10
    undef %13.sub0_sub1 = COPY killed %4
    %13.sub2_sub3 = COPY killed %12
    %20 = V_LSHL_B64 killed %19, 2, implicit $exec
    %16 = COPY killed %5
    BUFFER_STORE_DWORD_ADDR64 killed %16, killed %20, killed %13, 0, 0, 0, 0, 0, implicit $exec :: (store 4 into %ir.out)
    S_ENDPGM

...