restore-clobber-with-indirectness.mir

# RUN: llc %s -o - -experimental-debug-variable-locations=true \
# RUN:     -run-pass=livedebugvalues  | \
# RUN: FileCheck %s --implicit-check-not=DBG_VALUE
#
# Copy of follow-spill-of-live-value.mir. Test that if we have a variable
# location with the indirect flag set (i.e. DBG_VALUE $blah, 0...) then when we
# restore that register in the case of a clobber, we keep the indirectness flag.
#
## Capture variable num,
# CHECK: ![[VARNUM:[0-9]+]] = !DILocalVariable
#
# CHECK-LABEL: bb.0.entry:
# CHECK:       DBG_VALUE $r10, 0, ![[VARNUM]], !DIExpression(DW_OP_LLVM_fragment, 64, 64),
# CHECK:       DBG_VALUE $rsp, 0, ![[VARNUM]], !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_LLVM_fragment, 64, 64),
# CHECK:       DBG_VALUE $r10, 0, ![[VARNUM]], !DIExpression(DW_OP_LLVM_fragment, 64, 64),

--- |
  ; ModuleID = 'missingvar.ll'
  source_filename = "/fast/fs/llvm34/lib/Analysis/LoopPass.cpp"
  target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
  target triple = "x86_64-unknown-linux-gnu"
  
  define linkonce_odr void @_ZNSt5dequeIPN4llvm4LoopESaIS2_EE13_M_insert_auxESt15_Deque_iteratorIS2_RS2_PS2_EmRKS2_() local_unnamed_addr align 2 !dbg !3 {
  entry:
    call void @llvm.dbg.value(metadata i32 0, metadata !8, metadata !DIExpression()), !dbg !7
    ret void
  }

  declare void @llvm.dbg.value(metadata, metadata, metadata)
  
  !llvm.module.flags = !{!0}
  !llvm.dbg.cu = !{!1}
  
  !0 = !{i32 2, !"Debug Info Version", i32 3}
  !1 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "beards", isOptimized: true, runtimeVersion: 4, emissionKind: FullDebug)
  !2 = !DIFile(filename: "bees.cpp", directory: "")
  !3 = distinct !DISubprogram(name: "nope", scope: !2, file: !2, line: 1, type: !4, spFlags: DISPFlagDefinition, unit: !1)
  !4 = !DISubroutineType(types: !5)
  !5 = !{!6}
  !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !7 = !DILocation(line: 1, scope: !3)
  !8 = !DILocalVariable(name: "flannel", scope: !3)

...
---
name:            _ZNSt5dequeIPN4llvm4LoopESaIS2_EE13_M_insert_auxESt15_Deque_iteratorIS2_RS2_PS2_EmRKS2_
alignment:       16
tracksRegLiveness: true
debugInstrRef: true
liveins:
  - { reg: '$rdi' }
  - { reg: '$rsi' }
  - { reg: '$rdx' }
frameInfo:
  stackSize:       48
  offsetAdjustment: -48
  maxAlignment:    8
  maxCallFrameSize: 0
  cvBytesOfCalleeSavedRegisters: 48
fixedStack:
  - { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, callee-saved-register: '$rbx' }
  - { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, callee-saved-register: '$r12' }
  - { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, callee-saved-register: '$r13' }
  - { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, callee-saved-register: '$r14' }
  - { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$r15' }
  - { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$rbp' }
stack:
  - { id: 0, type: spill-slot, offset: -64, size: 8, alignment: 8 }
machineFunctionInfo: {}
body:             |
  bb.0.entry:
    liveins: $rdi, $rdx, $rsi, $rbp, $r15, $r14, $r13, $r12, $rbx
  
    renamable $r10 = MOV64rm undef renamable $rax, 1, $noreg, 0, $noreg, debug-instr-number 1, debug-location !7 :: (load 8 from `ptr undef`)
    renamable $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags
    DBG_VALUE $r10, 0, !8, !DIExpression(DW_OP_LLVM_fragment, 64, 64), debug-location !7
    TEST8rr renamable $al, renamable $al, implicit-def $eflags, implicit killed $eax, debug-location !7
    MOV64mr $rsp, 1, $noreg, -8, $noreg, renamable $r10 :: (store 8 into %stack.0)
    MOV64mr $rsp, 1, $noreg, -8, $noreg, renamable $rdi :: (store 8 into %stack.0)
    RET64
...
llvm/llvm/test/DebugInfo/MIR/InstrRef/restore-clobber-with-indirectness.mir
