src/llvm-project/llvm/test/DebugInfo/ARM/move-dbg-values-imm-test.mir

# RUN: llc -O2 %s -start-after=arm-mve-vpt-opts -stop-after=arm-prera-ldst-opt -o -  | FileCheck %s
# CHECK: DBG_VALUE 13, $noreg, !11, !DIExpression(), debug-location !13


# This test checks to make sure that a DBG_VALUE that uses an immediate doesn't get zero-ed out by a DBG_VALUE that comes later in the basic block, and describes the same variable.

--- |
  ; ModuleID = '/Users/shubham/Development/llvm-project/llvm/test/DebugInfo/Generic/incorrect-variable-debugloc1.ll'
  source_filename = "/Users/shubham/Development/llvm-project/llvm/test/DebugInfo/Generic/incorrect-variable-debugloc1.ll"
  target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
  target triple = "armv8-unknown-linux"
  
  ; Function Attrs: uwtable
  define i32 @main() !dbg !6 {
  entry:
    %c = alloca i32, align 4
    tail call void @llvm.dbg.value(metadata i32 13, metadata !11, metadata !DIExpression()), !dbg !13
    store volatile i32 13, ptr %c, align 4, !dbg !14
    %call = tail call i32 @_Z4funcv(), !dbg !15
    tail call void @llvm.dbg.value(metadata i32 %call, metadata !11, metadata !DIExpression()), !dbg !13
    store volatile i32 %call, ptr %c, align 4, !dbg !15
    tail call void @llvm.dbg.value(metadata ptr %c, metadata !11, metadata !DIExpression(DW_OP_deref)), !dbg !13
    %c.0.c.0. = load volatile i32, ptr %c, align 4, !dbg !16
    ret i32 %c.0.c.0., !dbg !16
  }
  
  declare i32 @_Z4funcv()
  
  declare void @llvm.dbg.value(metadata, metadata, metadata)
  
  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!3, !4}
  !llvm.ident = !{!5}
  
  !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.6.0 (trunk 223522)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
  !1 = !DIFile(filename: "test.cpp", directory: "/home/kromanova/ngh/ToT_latest/llvm/test/DebugInfo")
  !2 = !{}
  !3 = !{i32 2, !"Dwarf Version", i32 2}
  !4 = !{i32 2, !"Debug Info Version", i32 3}
  !5 = !{!"clang version 3.6.0 (trunk 223522)"}
  !6 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 3, type: !7, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
  !7 = !DISubroutineType(types: !8)
  !8 = !{!9}
  !9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
  !10 = !{!11}
  !11 = !DILocalVariable(name: "c", scope: !6, file: !1, line: 5, type: !12)
  !12 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !9)
  !13 = !DILocation(line: 5, column: 16, scope: !6)
  !14 = !DILocation(line: 5, column: 3, scope: !6)
  !15 = !DILocation(line: 6, column: 7, scope: !6)
  !16 = !DILocation(line: 7, column: 3, scope: !6)

...
---
name:            main
alignment:       4
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       false
callsEHReturn:   false
callsUnwindInit: false
hasEHCatchret:   false
hasEHScopes:     false
hasEHFunclets:   false
isOutlined:      false
debugInstrRef:   false
failsVerification: false
tracksDebugUserValues: false
registers:
  - { id: 0, class: gpr, preferred-register: '' }
  - { id: 1, class: gpr, preferred-register: '' }
  - { id: 2, class: gpr, preferred-register: '' }
liveins:         []
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    4
  adjustsStack:    true
  hasCalls:        true
  stackProtector:  ''
  functionContext: ''
  maxCallFrameSize: 0
  cvBytesOfCalleeSavedRegisters: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  hasTailCall:     false
  localFrameSize:  4
  savePoint:       ''
  restorePoint:    ''
fixedStack:      []
stack:
  - { id: 0, name: c, type: default, offset: 0, size: 4, alignment: 4, 
      stack-id: default, callee-saved-register: '', callee-saved-restored: true, 
      local-offset: -4, debug-info-variable: '', debug-info-expression: '', 
      debug-info-location: '' }
callSites:       []
debugValueSubstitutions: []
constants:       []
machineFunctionInfo: {}
body:             |
  bb.0.entry:
    DBG_VALUE 13, $noreg, !11, !DIExpression(), debug-location !13
    %0:gpr = MOVi 13, 14 /* CC::al */, $noreg, $noreg
    STRi12 killed %0, %stack.0.c, 0, 14 /* CC::al */, $noreg, debug-location !14 :: (volatile store (s32) into %ir.c)
    ADJCALLSTACKDOWN 0, 0, 14 /* CC::al */, $noreg, implicit-def dead $sp, implicit $sp, debug-location !15
    BL @_Z4funcv, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $r0, debug-location !15
    ADJCALLSTACKUP 0, -1, 14 /* CC::al */, $noreg, implicit-def dead $sp, implicit $sp, debug-location !15
    %1:gpr = COPY $r0, debug-location !15
    DBG_VALUE %1, $noreg, !11, !DIExpression(), debug-location !13
    STRi12 %1, %stack.0.c, 0, 14 /* CC::al */, $noreg, debug-location !15 :: (volatile store (s32) into %ir.c)
    DBG_VALUE %stack.0.c, $noreg, !11, !DIExpression(DW_OP_deref), debug-location !13
    %2:gpr = LDRi12 %stack.0.c, 0, 14 /* CC::al */, $noreg, debug-location !16 :: (volatile dereferenceable load (s32) from %ir.c)
    $r0 = COPY %2, debug-location !16
    BX_RET 14 /* CC::al */, $noreg, implicit $r0, debug-location !16

...