llvm/test/DebugInfo/MIR/X86/live-debug-values-3preds.mir

# RUN: llc -run-pass=livedebugvalues -march=x86-64 -o /dev/null %s 2>&1 | FileCheck %s

# Test the extension of debug ranges from 3 predecessors.
# Generated from the source file LiveDebugValues-3preds.c:
# #include <stdio.h>
# int add(int x, int y, int z, int a) {
#  int i;
#  for (i = 0; i < x * y; i++) {
#    if (i < x) {
#      a = a * x;
#      break;
#    }
#    if (i < y) {
#      a = a * y;
#      break;
#    }
#    if (i < z) {
#      a = a * z;
#      break;
#    }
#  }
#  return a;
# }
# with clang -g -O1 -c -emit-llvm LiveDebugValues-3preds.c -S -o live-debug-values-3preds.ll
# then llc -stop-after stackmap-liveness live-debug-values-3preds.ll -o /dev/null > live-debug-values-3preds.mir

# DBG_VALUE for variables "x", "y" and "z" are extended into BB#9 from its
# predecessors BB#0, BB#2 and BB#8.
# CHECK:      bb.9.for.end:
# CHECK:      DBG_VALUE debug-use %edx, debug-use _, !13, !16, debug-location !20
# CHECK-NEXT: DBG_VALUE debug-use %esi, debug-use _, !12, !16, debug-location !18
# CHECK-NEXT: DBG_VALUE debug-use %edi, debug-use _, !11, !16, debug-location !17


--- |
  ; ModuleID = 'live-debug-values-3preds.ll'
  target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
  target triple = "x86_64-unknown-linux-gnu"
  
  ; Function Attrs: norecurse nounwind readnone uwtable
  define i32 @add(i32 %x, i32 %y, i32 %z, i32 %a) #0 !dbg !4 {
  entry:
    tail call void @llvm.dbg.value(metadata i32 %x, i64 0, metadata !9, metadata !17), !dbg !18
    tail call void @llvm.dbg.value(metadata i32 %y, i64 0, metadata !10, metadata !17), !dbg !19
    tail call void @llvm.dbg.value(metadata i32 %z, i64 0, metadata !11, metadata !17), !dbg !21
    tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !12, metadata !17), !dbg !23
    tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !13, metadata !17), !dbg !25
    %mul = mul nsw i32 %y, %x, !dbg !26
    %cmp.24 = icmp sgt i32 %mul, 0, !dbg !30
    br i1 %cmp.24, label %for.body.preheader, label %for.end, !dbg !31
  
  for.body.preheader:                               ; preds = %entry
    br label %for.body, !dbg !32
  
  for.cond:                                         ; preds = %if.end.6
    %cmp = icmp slt i32 %inc, %mul, !dbg !30
    br i1 %cmp, label %for.body, label %for.end, !dbg !31
  
  for.body:                                         ; preds = %for.cond, %for.body.preheader
    %i.025 = phi i32 [ %inc, %for.cond ], [ 0, %for.body.preheader ]
    %0 = icmp sgt i32 %x, 0
    br i1 %0, label %if.then, label %if.end, !dbg !35
  
  if.then:                                          ; preds = %for.body
    %mul2 = mul nsw i32 %a, %x, !dbg !36
    tail call void @llvm.dbg.value(metadata i32 %mul2, i64 0, metadata !12, metadata !17), !dbg !23
    br label %for.end, !dbg !38
  
  if.end:                                           ; preds = %for.body
    %1 = icmp sgt i32 %y, 0
    br i1 %1, label %if.then.4, label %if.end.6, !dbg !39
  
  if.then.4:                                        ; preds = %if.end
    %mul5 = mul nsw i32 %a, %y, !dbg !40
    tail call void @llvm.dbg.value(metadata i32 %mul5, i64 0, metadata !12, metadata !17), !dbg !23
    br label %for.end, !dbg !43
  
  if.end.6:                                         ; preds = %if.end
    %2 = icmp sgt i32 %z, 0
    %inc = add nuw nsw i32 %i.025, 1, !dbg !44
    tail call void @llvm.dbg.value(metadata i32 %inc, i64 0, metadata !13, metadata !17), !dbg !25
    br i1 %2, label %if.then.8, label %for.cond, !dbg !45
  
  if.then.8:                                        ; preds = %if.end.6
    %mul9 = mul nsw i32 %a, %z, !dbg !46
    tail call void @llvm.dbg.value(metadata i32 %mul9, i64 0, metadata !12, metadata !17), !dbg !23
    br label %for.end, !dbg !49
  
  for.end:                                          ; preds = %for.cond, %if.then.8, %if.then.4, %if.then, %entry
    %a.addr.0 = phi i32 [ %mul2, %if.then ], [ %mul5, %if.then.4 ], [ %mul9, %if.then.8 ], [ %a, %entry ], [ %a, %for.cond ]
    ret i32 %a.addr.0, !dbg !50
  }
  
  ; Function Attrs: nounwind readnone
  declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
  
  attributes #0 = { norecurse nounwind readnone uwtable }
  attributes #1 = { nounwind readnone }
  
  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!14, !15}
  !llvm.ident = !{!16}
  
  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 253049) ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
  !1 = !DIFile(filename: "LiveDebugValues-3preds.c", directory: "/home/vt/julia/test/tvvikram")
  !2 = !{}
  !4 = distinct !DISubprogram(name: "add", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !8)
  !5 = !DISubroutineType(types: !6)
  !6 = !{!7, !7, !7, !7, !7}
  !7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
  !8 = !{!9, !10, !11, !12, !13}
  !9 = !DILocalVariable(name: "x", arg: 1, scope: !4, file: !1, line: 1, type: !7)
  !10 = !DILocalVariable(name: "y", arg: 2, scope: !4, file: !1, line: 1, type: !7)
  !11 = !DILocalVariable(name: "z", arg: 3, scope: !4, file: !1, line: 1, type: !7)
  !12 = !DILocalVariable(name: "a", arg: 4, scope: !4, file: !1, line: 1, type: !7)
  !13 = !DILocalVariable(name: "i", scope: !4, file: !1, line: 2, type: !7)
  !14 = !{i32 2, !"Dwarf Version", i32 4}
  !15 = !{i32 2, !"Debug Info Version", i32 3}
  !16 = !{!"clang version 3.8.0 (trunk 253049) "}
  !17 = !DIExpression()
  !18 = !DILocation(line: 1, column: 13, scope: !4)
  !19 = !DILocation(line: 1, column: 20, scope: !20)
  !20 = !DILexicalBlockFile(scope: !4, file: !1, discriminator: 1)
  !21 = !DILocation(line: 1, column: 27, scope: !22)
  !22 = !DILexicalBlockFile(scope: !4, file: !1, discriminator: 2)
  !23 = !DILocation(line: 1, column: 34, scope: !24)
  !24 = !DILexicalBlockFile(scope: !4, file: !1, discriminator: 3)
  !25 = !DILocation(line: 2, column: 7, scope: !20)
  !26 = !DILocation(line: 3, column: 21, scope: !27)
  !27 = !DILexicalBlockFile(scope: !28, file: !1, discriminator: 1)
  !28 = distinct !DILexicalBlock(scope: !29, file: !1, line: 3, column: 3)
  !29 = distinct !DILexicalBlock(scope: !4, file: !1, line: 3, column: 3)
  !30 = !DILocation(line: 3, column: 17, scope: !27)
  !31 = !DILocation(line: 3, column: 3, scope: !27)
  !32 = !DILocation(line: 4, column: 11, scope: !33)
  !33 = distinct !DILexicalBlock(scope: !34, file: !1, line: 4, column: 9)
  !34 = distinct !DILexicalBlock(scope: !28, file: !1, line: 3, column: 31)
  !35 = !DILocation(line: 4, column: 9, scope: !34)
  !36 = !DILocation(line: 5, column: 13, scope: !37)
  !37 = distinct !DILexicalBlock(scope: !33, file: !1, line: 4, column: 16)
  !38 = !DILocation(line: 6, column: 7, scope: !37)
  !39 = !DILocation(line: 8, column: 9, scope: !34)
  !40 = !DILocation(line: 9, column: 13, scope: !41)
  !41 = distinct !DILexicalBlock(scope: !42, file: !1, line: 8, column: 16)
  !42 = distinct !DILexicalBlock(scope: !34, file: !1, line: 8, column: 9)
  !43 = !DILocation(line: 10, column: 7, scope: !41)
  !44 = !DILocation(line: 3, column: 27, scope: !28)
  !45 = !DILocation(line: 12, column: 9, scope: !34)
  !46 = !DILocation(line: 13, column: 13, scope: !47)
  !47 = distinct !DILexicalBlock(scope: !48, file: !1, line: 12, column: 16)
  !48 = distinct !DILexicalBlock(scope: !34, file: !1, line: 12, column: 9)
  !49 = !DILocation(line: 14, column: 7, scope: !47)
  !50 = !DILocation(line: 17, column: 3, scope: !4)

...
---
name:            add
alignment:       4
exposesReturnsTwice: false
hasInlineAsm:    false
allVRegsAllocated: true
isSSA:           false
tracksRegLiveness: true
tracksSubRegLiveness: false
liveins:         
  - { reg: '%edi' }
  - { reg: '%esi' }
  - { reg: '%edx' }
  - { reg: '%ecx' }
frameInfo:       
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    0
  adjustsStack:    false
  hasCalls:        false
  maxCallFrameSize: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
body:             |
  bb.0.entry:
    successors: %bb.1.for.body.preheader(20), %bb.9.for.end(12)
    liveins: %ecx, %edi, %edx, %esi
  
    DBG_VALUE debug-use %edi, debug-use _, !9, !17, debug-location !18
    DBG_VALUE debug-use %esi, debug-use _, !10, !17, debug-location !19
    DBG_VALUE debug-use %edx, debug-use _, !11, !17, debug-location !21
    DBG_VALUE debug-use %ecx, debug-use _, !12, !17, debug-location !23
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    %r8d = MOV32rr %esi, debug-location !26
    %r8d = IMUL32rr killed %r8d, %edi, implicit-def dead %eflags, debug-location !26
    TEST32rr %r8d, %r8d, implicit-def %eflags, debug-location !31
    JLE_1 %bb.9.for.end, implicit %eflags
  
  bb.1.for.body.preheader:
    successors: %bb.3.for.body(0)
    liveins: %ecx, %edi, %edx, %esi, %r8d
  
    DBG_VALUE debug-use %edi, debug-use _, !9, !17, debug-location !18
    DBG_VALUE debug-use %esi, debug-use _, !10, !17, debug-location !19
    DBG_VALUE debug-use %edx, debug-use _, !11, !17, debug-location !21
    DBG_VALUE debug-use %ecx, debug-use _, !12, !17, debug-location !23
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    %eax = XOR32rr undef %eax, undef %eax, implicit-def dead %eflags
  
  bb.3.for.body (align 4):
    successors: %bb.4.if.then(4), %bb.5.if.end(124)
    liveins: %eax, %ecx, %edi, %edx, %esi, %r8d
  
    DBG_VALUE debug-use %edi, debug-use _, !9, !17, debug-location !18
    DBG_VALUE debug-use %esi, debug-use _, !10, !17, debug-location !19
    DBG_VALUE debug-use %edx, debug-use _, !11, !17, debug-location !21
    DBG_VALUE debug-use %ecx, debug-use _, !12, !17, debug-location !23
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    TEST32rr %edi, %edi, implicit-def %eflags, debug-location !35
    JG_1 %bb.4.if.then, implicit %eflags
  
  bb.5.if.end:
    successors: %bb.6.if.then.4(4), %bb.7.if.end.6(124)
    liveins: %eax, %ecx, %edi, %edx, %esi, %r8d
  
    DBG_VALUE debug-use %edi, debug-use _, !9, !17, debug-location !18
    DBG_VALUE debug-use %esi, debug-use _, !10, !17, debug-location !19
    DBG_VALUE debug-use %edx, debug-use _, !11, !17, debug-location !21
    DBG_VALUE debug-use %ecx, debug-use _, !12, !17, debug-location !23
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    TEST32rr %esi, %esi, implicit-def %eflags, debug-location !39
    JG_1 %bb.6.if.then.4, implicit %eflags
  
  bb.7.if.end.6:
    successors: %bb.8.if.then.8(4), %bb.2.for.cond(124)
    liveins: %eax, %ecx, %edi, %edx, %esi, %r8d
  
    DBG_VALUE debug-use %edi, debug-use _, !9, !17, debug-location !18
    DBG_VALUE debug-use %esi, debug-use _, !10, !17, debug-location !19
    DBG_VALUE debug-use %edx, debug-use _, !11, !17, debug-location !21
    DBG_VALUE debug-use %ecx, debug-use _, !12, !17, debug-location !23
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    TEST32rr %edx, %edx, implicit-def %eflags, debug-location !45
    JG_1 %bb.8.if.then.8, implicit %eflags
  
  bb.2.for.cond:
    successors: %bb.3.for.body(124), %bb.9.for.end(4)
    liveins: %eax, %ecx, %edi, %edx, %esi, %r8d
  
    DBG_VALUE debug-use %edi, debug-use _, !9, !17, debug-location !18
    DBG_VALUE debug-use %esi, debug-use _, !10, !17, debug-location !19
    DBG_VALUE debug-use %edx, debug-use _, !11, !17, debug-location !21
    DBG_VALUE debug-use %ecx, debug-use _, !12, !17, debug-location !23
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    %eax = INC32r killed %eax, implicit-def dead %eflags, debug-location !44
    DBG_VALUE debug-use %eax, debug-use _, !13, !17, debug-location !25
    CMP32rr %eax, %r8d, implicit-def %eflags, debug-location !31
    JL_1 %bb.3.for.body, implicit %eflags
    JMP_1 %bb.9.for.end
  
  bb.4.if.then:
    liveins: %ecx, %edi
  
    DBG_VALUE debug-use %edi, debug-use _, !9, !17, debug-location !18
    DBG_VALUE debug-use %ecx, debug-use _, !12, !17, debug-location !23
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    %ecx = IMUL32rr killed %ecx, killed %edi, implicit-def dead %eflags, debug-location !36
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    %eax = MOV32rr killed %ecx, debug-location !50
    RETQ %eax, debug-location !50
  
  bb.6.if.then.4:
    liveins: %ecx, %esi
  
    DBG_VALUE debug-use %esi, debug-use _, !10, !17, debug-location !19
    DBG_VALUE debug-use %ecx, debug-use _, !12, !17, debug-location !23
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    %ecx = IMUL32rr killed %ecx, killed %esi, implicit-def dead %eflags, debug-location !40
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    %eax = MOV32rr killed %ecx, debug-location !50
    RETQ %eax, debug-location !50
  
  bb.8.if.then.8:
    successors: %bb.9.for.end(0)
    liveins: %ecx, %edx
  
    DBG_VALUE debug-use %edx, debug-use _, !11, !17, debug-location !21
    DBG_VALUE debug-use %ecx, debug-use _, !12, !17, debug-location !23
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    %ecx = IMUL32rr killed %ecx, killed %edx, implicit-def dead %eflags, debug-location !46
  
  bb.9.for.end:
    liveins: %ecx
  
    DBG_VALUE 0, 0, !13, !17, debug-location !25
    %eax = MOV32rr killed %ecx, debug-location !50
    RETQ %eax, debug-location !50

...