test/DebugInfo/MIR/X86/sink-leaves-undef.mir

# RUN: llc %s -o - -run-pass=machine-sink -mtriple=x86_64-- | FileCheck %s
# This is a copy of test/CodeGen/X86/MachineSink-DbgValue.ll, where we
# additionally test that when the MOV32rm defining %0 is sunk, it leaves
# an 'undef' DBG_VALUE behind to terminate earlier location ranges.
--- |
  target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
  target triple = "x86_64-apple-macosx10.7.0"
  
  ; Function Attrs: nounwind readonly ssp uwtable
  define i32 @foo(i32 %i, i32* nocapture %c) !dbg !4 {
    call void @llvm.dbg.value(metadata i32 %i, metadata !9, metadata !DIExpression()), !dbg !14
    %ab = load i32, i32* %c, align 1, !dbg !15
    call void @llvm.dbg.value(metadata i32* %c, metadata !10, metadata !DIExpression()), !dbg !16
    call void @llvm.dbg.value(metadata i32 %ab, metadata !12, metadata !DIExpression()), !dbg !15
    %cd = icmp eq i32 %i, 42, !dbg !17
    br i1 %cd, label %bb1, label %bb2, !dbg !17
  
  bb1:                                              ; preds = %0
    %gh = add nsw i32 %ab, 2, !dbg !18
    br label %bb2, !dbg !18
  
  bb2:                                              ; preds = %bb1, %0
    %.0 = phi i32 [ %gh, %bb1 ], [ 0, %0 ]
    ret i32 %.0, !dbg !19
  }
  
  ; Function Attrs: nounwind readnone speculatable
  declare void @llvm.dbg.value(metadata, metadata, metadata)
  
  ; Function Attrs: nounwind
  declare void @llvm.stackprotector(i8*, i8**)
  
  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!3}
  
  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "Apple clang version 3.0 (tags/Apple/clang-211.10.1) (based on LLVM 3.0svn)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2)
  !1 = !DIFile(filename: "a.c", directory: "/private/tmp")
  !2 = !{}
  !3 = !{i32 1, !"Debug Info Version", i32 3}
  !4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !5, virtualIndex: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
  !5 = !DISubroutineType(types: !6)
  !6 = !{!7}
  !7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
  !8 = !{!9, !10, !12}
  !9 = !DILocalVariable(name: "i", arg: 1, scope: !4, file: !1, line: 2, type: !7)
  !10 = !DILocalVariable(name: "c", arg: 2, scope: !4, file: !1, line: 2, type: !11)
  !11 = !DIDerivedType(tag: DW_TAG_pointer_type, scope: !0, baseType: !7, size: 64, align: 64)
  !12 = !DILocalVariable(name: "a", scope: !13, file: !1, line: 3, type: !7)
  !13 = distinct !DILexicalBlock(scope: !4, file: !1, line: 2, column: 25)
  !14 = !DILocation(line: 2, column: 13, scope: !4)
  !15 = !DILocation(line: 3, column: 14, scope: !13)
  !16 = !DILocation(line: 2, column: 22, scope: !4)
  !17 = !DILocation(line: 4, column: 3, scope: !13)
  !18 = !DILocation(line: 5, column: 5, scope: !13)
  !19 = !DILocation(line: 7, column: 1, scope: !13)
  ; CHECK: ![[VARNUM:[0-9]+]] = !DILocalVariable(name: "a",
...
---
name:            foo
alignment:       4
tracksRegLiveness: true
registers:       
  - { id: 0, class: gr32 }
  - { id: 1, class: gr32 }
  - { id: 2, class: gr32 }
  - { id: 3, class: gr32 }
  - { id: 4, class: gr64 }
  - { id: 5, class: gr32 }
  - { id: 6, class: gr32 }
liveins:         
  - { reg: '$edi', virtual-reg: '%3' }
  - { reg: '$rsi', virtual-reg: '%4' }
body:             |
  bb.0 (%ir-block.0):
    successors: %bb.1, %bb.2
    liveins: $edi, $rsi
  ; CHECK-LABEL: bb.0 (%ir-block.0):
  ; CHECK:       DBG_VALUE $noreg, $noreg, ![[VARNUM]]
  
    DBG_VALUE $edi, $noreg, !9, !DIExpression(), debug-location !14
    DBG_VALUE $rsi, $noreg, !10, !DIExpression(), debug-location !16
    %4:gr64 = COPY $rsi
    DBG_VALUE %4, $noreg, !10, !DIExpression(), debug-location !16
    %3:gr32 = COPY $edi
    DBG_VALUE %3, $noreg, !9, !DIExpression(), debug-location !14
    %0:gr32 = MOV32rm %4, 1, $noreg, 0, $noreg, debug-location !15 :: (load 4 from %ir.c, align 1)
    DBG_VALUE %0, $noreg, !12, !DIExpression(), debug-location !15
    %5:gr32 = MOV32r0 implicit-def dead $eflags
    %6:gr32 = SUB32ri8 %3, 42, implicit-def $eflags, debug-location !17
    JCC_1 %bb.2, 5, implicit $eflags, debug-location !17
    JMP_1 %bb.1, debug-location !17
  
  bb.1.bb1:
  ; CHECK-LABEL: bb.1.bb1:
  ; CHECK:       %[[VREG:[0-9]+]]:gr32 = MOV32rm
  ; CHECK-NEXT:  DBG_VALUE %[[VREG]], $noreg, ![[VARNUM]]
  ; CHECK-NEXT:  ADD32ri8
    %1:gr32 = nsw ADD32ri8 %0, 2, implicit-def dead $eflags, debug-location !18
  
  bb.2.bb2:
    %2:gr32 = PHI %5, %bb.0, %1, %bb.1
    $eax = COPY %2, debug-location !19
    RET 0, $eax, debug-location !19

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