llvm/test/CodeGen/X86/debug-spilled-snippet.mir

# RUN: llc -mtriple i386 -start-before=greedy -stop-after=livedebugvars %s -o - | FileCheck %s

# There should be multiple debug values for this variable after regalloc. The
# value has been spilled, but we shouldn't lose track of the location because
# of this.

# CHECK-COUNT-4: DBG_VALUE $ebp, 0, !6, !DIExpression(DW_OP_constu, 16, DW_OP_minus), debug-location !10

--- |
  
  define void @main() #0 !dbg !4 {
  entry:
  #dbg_value(i32 undef, !6, !DIExpression(), !10)
    ret void
  }
  
  attributes #0 = { "frame-pointer"="all" }
  
  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!3}
  
  !0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 20.0.0git.prerel", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, globals: !2, splitDebugInlining: false, nameTableKind: None)
  !1 = !DIFile(filename: "xx.c", directory: "/path", checksumkind: CSK_MD5, checksum: "c4b2fc62bca9171ad484c91fb78b8842")
  !2 = !{}
  !3 = !{i32 2, !"Debug Info Version", i32 3}
  !4 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 20, type: !5, scopeLine: 20, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
  !5 = !DISubroutineType(types: !2)
  !6 = !DILocalVariable(name: "flag", arg: 2, scope: !7, file: !1, line: 8, type: !9)
  !7 = distinct !DISubprogram(name: "transparent_crc", scope: !1, file: !1, line: 8, type: !8, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
  !8 = distinct !DISubroutineType(types: !2)
  !9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !10 = !DILocation(line: 0, scope: !7, inlinedAt: !11)
  !11 = distinct !DILocation(line: 28, column: 3, scope: !4)

...
---
name:            main
alignment:       16
tracksRegLiveness: true
hasWinCFI:       false
noPhis:          true
fixedStack:
  - { id: 0, type: default, offset: 0, size: 4, alignment: 4, stack-id: default, 
      isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 1, type: default, offset: 4, size: 4, alignment: 4, stack-id: default, 
      isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 2, type: default, offset: 8, size: 1, alignment: 4, stack-id: default, 
      isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 3, type: default, offset: 12, size: 4, alignment: 4, stack-id: default, 
      isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
body:             |
  bb.0:
    successors: %bb.2(0x80000000)
  
    %0:gr32 = MOV32rm %fixed-stack.3, 1, $noreg, 0, $noreg :: (load (s32) from %fixed-stack.3)
    %1:gr8 = MOV8rm %fixed-stack.2, 1, $noreg, 0, $noreg :: (load (s8) from %fixed-stack.2, align 4)
    %2:gr32 = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (load (s32) from %fixed-stack.0)
    %3:gr32_abcd = MOV32r0 implicit-def dead $eflags
    TEST32rr %2, %2, implicit-def $eflags
    %3.sub_8bit:gr32_abcd = SETCCr 5, implicit $eflags
    %4:gr32 = COPY %2
    %4:gr32 = SAR32ri %4, 1, implicit-def dead $eflags
    %5:gr32 = MOV32rm %fixed-stack.1, 1, $noreg, 0, $noreg :: (load (s32) from %fixed-stack.1)
    %6:gr32 = MOV32r0 implicit-def dead $eflags
    JMP_1 %bb.2
  
  bb.1:
    successors: %bb.4(0x30000000), %bb.3(0x50000000)
  
    DBG_VALUE %3, $noreg, !6, !DIExpression(), debug-location !10
    TEST32rr %3, %3, implicit-def $eflags
    JCC_1 %bb.4, 4, implicit $eflags
    JMP_1 %bb.3
  
  bb.2:
    successors: %bb.1(0x04000000), %bb.2(0x7c000000)
  
    %6:gr32 = XOR32rr %6, %0, implicit-def dead $eflags
    %6:gr32 = SAR32ri %6, 2, implicit-def dead $eflags
    %6:gr32 = XOR32rr %6, %4, implicit-def dead $eflags
    %6:gr32 = XOR32rr %6, %5, implicit-def dead $eflags
    %6:gr32 = XOR32rr %6, %2, implicit-def dead $eflags
    TEST8ri %1, 1, implicit-def $eflags
    JCC_1 %bb.1, 5, implicit $eflags
    JMP_1 %bb.2
  
  bb.3:
    successors: %bb.4(0x80000000)
  
    MOV32mi $noreg, 1, $noreg, 4, $noreg, 0 :: (store (s32) into `ptr null` + 4)
    MOV32mi $noreg, 1, $noreg, 0, $noreg, 0 :: (store (s32) into `ptr null`)
  
  bb.4:
    RET 0

...