# RUN: llc -o - %s -run-pass=shrink-wrap | FileCheck %s
--- |
  ; ModuleID = '<stdin>'
  source_filename = "t.c"
  target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
  target triple = "i386-pc-windows-msvc19.11.25508"
  
  ; Function Attrs: nounwind
  define x86_fastcallcc i32 @"@shrink_wrap_basic@16"(i32 inreg %a, i32 inreg %b, i32 %c, i32 %d) local_unnamed_addr #0 !dbg !8 {
  entry:
    %c.addr = alloca i32, align 4
    tail call void @llvm.dbg.value(metadata i32 %d, metadata !13, metadata !DIExpression()), !dbg !19
    tail call void @llvm.dbg.value(metadata i32 %c, metadata !14, metadata !DIExpression()), !dbg !20
    store i32 %c, i32* %c.addr, align 4, !tbaa !21
    tail call void @llvm.dbg.value(metadata i32 %b, metadata !15, metadata !DIExpression()), !dbg !25
    tail call void @llvm.dbg.value(metadata i32 %a, metadata !16, metadata !DIExpression()), !dbg !26
    %cmp = icmp slt i32 %a, %b, !dbg !27
    br i1 %cmp, label %return, label %for.cond.preheader, !dbg !29
  
  for.cond.preheader:                               ; preds = %entry
    %0 = add i32 %c, -1, !dbg !30
    br label %for.cond, !dbg !30
  
  for.cond:                                         ; preds = %for.cond, %for.cond.preheader
    %lsr.iv = phi i32 [ %lsr.iv.next, %for.cond ], [ %0, %for.cond.preheader ]
    call void @llvm.dbg.value(metadata i32 undef, metadata !17, metadata !DIExpression()), !dbg !32
    call void @llvm.dbg.value(metadata i32* %c.addr, metadata !14, metadata !DIExpression()), !dbg !20
    %call = call i32 @doSomething(i32* nonnull %c.addr) #3, !dbg !33
    call void @llvm.dbg.value(metadata !2, metadata !17, metadata !DIExpression()), !dbg !32
    %lsr.iv.next = add i32 %lsr.iv, 1, !dbg !30
    %cmp1 = icmp slt i32 %lsr.iv.next, %d, !dbg !30
    br i1 %cmp1, label %for.cond, label %return, !dbg !34, !llvm.loop !35
  
  return:                                           ; preds = %for.cond, %entry
    %retval.0 = phi i32 [ %a, %entry ], [ %call, %for.cond ]
    ret i32 %retval.0, !dbg !37
  }
  
  declare i32 @doSomething(i32*) local_unnamed_addr
  
  ; Function Attrs: nounwind readnone speculatable
  declare void @llvm.dbg.value(metadata, metadata, metadata) #2
  
  ; Function Attrs: nounwind
  declare void @llvm.stackprotector(i8*, i8**) #3
  
  attributes #0 = { nounwind }
  attributes #2 = { nounwind readnone speculatable }
  attributes #3 = { nounwind }
  
  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!3, !4, !5, !6}
  !llvm.ident = !{!7}
  
  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
  !1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "32f118fd5dd7e65ff7733c49b2f804ef")
  !2 = !{}
  !3 = !{i32 1, !"NumRegisterParameters", i32 0}
  !4 = !{i32 2, !"CodeView", i32 1}
  !5 = !{i32 2, !"Debug Info Version", i32 3}
  !6 = !{i32 1, !"wchar_size", i32 2}
  !7 = !{!"clang version 6.0.0 "}
  !8 = distinct !DISubprogram(name: "shrink_wrap_basic", linkageName: "\01@shrink_wrap_basic@16", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
  !9 = !DISubroutineType(cc: DW_CC_BORLAND_msfastcall, types: !10)
  !10 = !{!11, !11, !11, !11, !11}
  !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !12 = !{!13, !14, !15, !16, !17}
  !13 = !DILocalVariable(name: "d", arg: 4, scope: !8, file: !1, line: 2, type: !11)
  !14 = !DILocalVariable(name: "c", arg: 3, scope: !8, file: !1, line: 2, type: !11)
  !15 = !DILocalVariable(name: "b", arg: 2, scope: !8, file: !1, line: 2, type: !11)
  !16 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 2, type: !11)
  !17 = !DILocalVariable(name: "i", scope: !18, file: !1, line: 5, type: !11)
  !18 = distinct !DILexicalBlock(scope: !8, file: !1, line: 5, column: 3)
  !19 = !DILocation(line: 2, column: 59, scope: !8)
  !20 = !DILocation(line: 2, column: 52, scope: !8)
  !21 = !{!22, !22, i64 0}
  !22 = !{!"int", !23, i64 0}
  !23 = !{!"omnipotent char", !24, i64 0}
  !24 = !{!"Simple C/C++ TBAA"}
  !25 = !DILocation(line: 2, column: 45, scope: !8)
  !26 = !DILocation(line: 2, column: 38, scope: !8)
  !27 = !DILocation(line: 3, column: 9, scope: !28)
  !28 = distinct !DILexicalBlock(scope: !8, file: !1, line: 3, column: 7)
  !29 = !DILocation(line: 3, column: 7, scope: !8)
  !30 = !DILocation(line: 5, column: 21, scope: !31)
  !31 = distinct !DILexicalBlock(scope: !18, file: !1, line: 5, column: 3)
  !32 = !DILocation(line: 5, column: 12, scope: !18)
  !33 = !DILocation(line: 0, scope: !8)
  !34 = !DILocation(line: 5, column: 3, scope: !18)
  !35 = distinct !{!35, !34, !36}
  !36 = !DILocation(line: 6, column: 19, scope: !18)
  !37 = !DILocation(line: 8, column: 1, scope: !8)

...
---
name:            '@shrink_wrap_basic@16'
alignment:       16
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:       
liveins:         
  - { reg: '$ecx', virtual-reg: '' }
  - { reg: '$edx', virtual-reg: '' }
frameInfo:       
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    4
  adjustsStack:    false
  hasCalls:        true
  stackProtector:  ''
  maxCallFrameSize: 4294967295
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  # CHECK: savePoint:       '%bb.1'
  # CHECK: restorePoint:    '%bb.3'
  savePoint:       ''
  restorePoint:    ''
fixedStack:      
  - { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: default,
      isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true }
  - { id: 1, type: default, offset: 0, size: 4, alignment: 4, stack-id: default,
      isImmutable: false, isAliased: false, callee-saved-register: '', 
      callee-saved-restored: true }
stack:           
constants:       
body:             |
  bb.0.entry:
    successors: %bb.4(0x40000000), %bb.1(0x40000000)
    liveins: $ecx, $edx
  
    DBG_VALUE $edx, $noreg, !15, !DIExpression(), debug-location !25
    DBG_VALUE $ecx, $noreg, !16, !DIExpression(), debug-location !26
    $eax = COPY $ecx
    DBG_VALUE %fixed-stack.0, 0, !16, !DIExpression(), debug-location !26
    DBG_VALUE %fixed-stack.1, 0, !15, !DIExpression(), debug-location !25
    CMP32rr $eax, killed $edx, implicit-def $eflags, debug-location !27
    JCC_1 %bb.4, 12, implicit killed $eflags, debug-location !29
    JMP_1 %bb.1, debug-location !29
  
  bb.1.for.cond.preheader:
    successors: %bb.2(0x80000000)
  
    $esi = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (load 4 from %fixed-stack.0)
    DBG_VALUE $esi, $noreg, !13, !DIExpression(), debug-location !19
    $edi = MOV32rm %fixed-stack.1, 1, $noreg, 0, $noreg :: (load 4 from %fixed-stack.1)
    DBG_VALUE $edi, $noreg, !14, !DIExpression(), debug-location !20
    $edi = DEC32r killed $edi, implicit-def dead $eflags, debug-location !30
    $ebx = LEA32r %fixed-stack.1, 1, $noreg, 0, $noreg
  
  bb.2.for.cond:
    successors: %bb.2(0x7c000000), %bb.3(0x04000000)
    liveins: $ebx, $edi, $esi
  
    ADJCALLSTACKDOWN32 4, 0, 4, implicit-def dead $esp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $esp, implicit $ssp, debug-location !33
    DBG_VALUE %fixed-stack.1, 0, !14, !DIExpression(), debug-location !20
    PUSH32r $ebx, implicit-def $esp, implicit $esp, debug-location !33
    CFI_INSTRUCTION adjust_cfa_offset 4, debug-location !33
    CALLpcrel32 @doSomething, csr_32, implicit $esp, implicit $ssp, implicit-def $esp, implicit-def $ssp, implicit-def $eax, debug-location !33
    ADJCALLSTACKUP32 4, 0, implicit-def dead $esp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $esp, implicit $ssp, debug-location !33
    $edi = INC32r killed $edi, implicit-def dead $eflags, debug-location !30
    CMP32rr $edi, $esi, implicit-def $eflags, debug-location !30
    JCC_1 %bb.2, 12, implicit killed $eflags, debug-location !34
  
  bb.3:
    successors: %bb.4(0x80000000)
    liveins: $eax
  
  
  bb.4.return:
    liveins: $eax
  
    RET 8, $eax, debug-location !37

...