# RUN: llc -start-after=livedebugvalues -filetype=obj -o - %s \
# RUN:   | llvm-dwarfdump - | FileCheck %s
# CHECK: .debug_info contents:
# CHECK: DW_TAG_formal_parameter
# CHECK: DW_TAG_formal_parameter
# CHECK-NEXT: DW_AT_location
# CHECK-NEXT:   0x0000000000000000 - 0x0000000000000014: DW_OP_reg1 W1
# CHECK-NEXT:   0x0000000000000014 - 0x0000000000000038: DW_OP_breg31 WSP+8
# CHECK-NEXT: DW_AT_name {{.*}}"y"

--- |
  ; Generated at -Os from:
  ;   struct Rect {
  ;     double x, y, w, h;
  ;   };
  ;   void g(struct Rect);
  ;   void h(int *);
  ;   int f(int x, int y, struct Rect s) {
  ;     g(s);
  ;     if (y)
  ;       h(&x);
  ;     return 0;
  ;   }
  source_filename = "/tmp/clobber.c"
  target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
  target triple = "arm64-apple-ios"
  
  %struct.Rect = type { double, double, double, double }
  
  ; Function Attrs: nounwind optsize ssp
  define i32 @f(i32 %x, i32 %y, [4 x double] %s.coerce) local_unnamed_addr #0 !dbg !7 {
  entry:
    %x.addr = alloca i32, align 4
    tail call void @llvm.dbg.value(metadata i32 %x, i64 0, metadata !19, metadata !22), !dbg !23
    store i32 %x, i32* %x.addr, align 4, !tbaa !24
    tail call void @llvm.dbg.value(metadata i32 %y, i64 0, metadata !20, metadata !22), !dbg !28
    tail call void @llvm.dbg.declare(metadata %struct.Rect* undef, metadata !21, metadata !22), !dbg !29
    tail call void @g([4 x double] %s.coerce) #4, !dbg !30
    %tobool = icmp eq i32 %y, 0, !dbg !31
    br i1 %tobool, label %if.end, label %if.then, !dbg !33
  
  if.then:                                          ; preds = %entry
    tail call void @llvm.dbg.value(metadata i32* %x.addr, i64 0, metadata !19, metadata !22), !dbg !23
    call void @h(i32* nonnull %x.addr) #4, !dbg !34
    br label %if.end, !dbg !34
  
  if.end:                                           ; preds = %if.then, %entry
    ret i32 0, !dbg !35
  }
  
  declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
  declare void @g([4 x double]) local_unnamed_addr #2
  declare void @h(i32*) local_unnamed_addr #2
  declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
  declare void @llvm.stackprotector(i8*, i8**) #3
  
  attributes #0 = { nounwind optsize ssp }
  attributes #1 = { nounwind readnone speculatable }
  attributes #2 = { optsize }
  attributes #3 = { nounwind }
  attributes #4 = { nounwind optsize }
  
  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!3, !4, !5}
  !llvm.ident = !{!6}
  
  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 (trunk 302682) (llvm/trunk 302683)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
  !1 = !DIFile(filename: "/tmp/clobber.c", directory: "/Volumes/Data/apple-internal/swift")
  !2 = !{}
  !3 = !{i32 2, !"Dwarf Version", i32 2}
  !4 = !{i32 2, !"Debug Info Version", i32 3}
  !5 = !{i32 1, !"PIC Level", i32 2}
  !6 = !{!"clang version 5.0.0 (trunk 302682) (llvm/trunk 302683)"}
  !7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 7, type: !8, isLocal: false, isDefinition: true, scopeLine: 7, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !18)
  !8 = !DISubroutineType(types: !9)
  !9 = !{!10, !10, !10, !11}
  !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Rect", file: !1, line: 1, size: 256, elements: !12)
  !12 = !{!13, !15, !16, !17}
  !13 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !11, file: !1, line: 2, baseType: !14, size: 64)
  !14 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float)
  !15 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !11, file: !1, line: 2, baseType: !14, size: 64, offset: 64)
  !16 = !DIDerivedType(tag: DW_TAG_member, name: "w", scope: !11, file: !1, line: 2, baseType: !14, size: 64, offset: 128)
  !17 = !DIDerivedType(tag: DW_TAG_member, name: "h", scope: !11, file: !1, line: 2, baseType: !14, size: 64, offset: 192)
  !18 = !{!19, !20, !21}
  !19 = !DILocalVariable(name: "x", arg: 1, scope: !7, file: !1, line: 7, type: !10)
  !20 = !DILocalVariable(name: "y", arg: 2, scope: !7, file: !1, line: 7, type: !10)
  !21 = !DILocalVariable(name: "s", arg: 3, scope: !7, file: !1, line: 7, type: !11)
  !22 = !DIExpression()
  !23 = !DILocation(line: 7, column: 11, scope: !7)
  !24 = !{!25, !25, i64 0}
  !25 = !{!"int", !26, i64 0}
  !26 = !{!"omnipotent char", !27, i64 0}
  !27 = !{!"Simple C/C++ TBAA"}
  !28 = !DILocation(line: 7, column: 18, scope: !7)
  !29 = !DILocation(line: 7, column: 33, scope: !7)
  !30 = !DILocation(line: 8, column: 3, scope: !7)
  !31 = !DILocation(line: 9, column: 7, scope: !32)
  !32 = distinct !DILexicalBlock(scope: !7, file: !1, line: 9, column: 7)
  !33 = !DILocation(line: 9, column: 7, scope: !7)
  !34 = !DILocation(line: 10, column: 5, scope: !32)
  !35 = !DILocation(line: 12, column: 3, scope: !7)
  !36 = !DIExpression(DW_OP_constu, 8, DW_OP_plus)

...
---
name:            f
alignment:       2
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
tracksRegLiveness: true
liveins:         
  - { reg: '%w0' }
  - { reg: '%w1' }
  - { reg: '%d0' }
  - { reg: '%d1' }
  - { reg: '%d2' }
  - { reg: '%d3' }
frameInfo:       
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       32
  offsetAdjustment: 0
  maxAlignment:    8
  adjustsStack:    true
  hasCalls:        true
  maxCallFrameSize: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
stack:           
  - { id: 0, name: x.addr, offset: -20, size: 4, alignment: 4, local-offset: -4 }
  - { id: 1, type: spill-slot, offset: -24, size: 4, alignment: 4 }
  - { id: 2, type: spill-slot, offset: -8, size: 8, alignment: 8, callee-saved-register: '%lr' }
  - { id: 3, type: spill-slot, offset: -16, size: 8, alignment: 8, callee-saved-register: '%fp' }
body:             |
  bb.0.entry:
    successors: %bb.2.if.end(0x40000000), %bb.1.if.then(0x40000000)
    liveins: %w0, %w1, %d0, %d1, %d2, %d3, %lr
  
    %sp = frame-setup SUBXri %sp, 32, 0
    frame-setup STPXi killed %fp, killed %lr, %sp, 2 :: (store 8 into %stack.3), (store 8 into %stack.2)
    %fp = frame-setup ADDXri %sp, 16, 0
    DBG_VALUE debug-use %w0, debug-use _, !19, !22, debug-location !23
    STURWi killed %w0, %fp, -4 :: (store 4 into %stack.0.x.addr)
    DBG_VALUE debug-use %w1, debug-use _, !20, !22, debug-location !28
    STRWui killed %w1, %sp, 2, debug-location !30 :: (store 4 into %stack.1)
    DBG_VALUE %sp, 0, !20, !36, debug-location !28
    BL @g, csr_aarch64_aapcs, implicit-def dead %lr, implicit %sp, implicit killed %d0, implicit killed %d1, implicit killed %d2, implicit killed %d3, implicit-def %sp, debug-location !30
    %w0 = LDRWui %sp, 2, debug-location !33 :: (load 4 from %stack.1)
    CBZW killed %w0, %bb.2.if.end, debug-location !33
  
  bb.1.if.then:
    successors: %bb.2.if.end(0x80000000)
  
    DBG_VALUE debug-use %sp, 0, !20, !36, debug-location !28
    %x0 = SUBXri %fp, 4, 0
    DBG_VALUE debug-use %x0, debug-use _, !19, !22, debug-location !23
    BL @h, csr_aarch64_aapcs, implicit-def dead %lr, implicit %sp, implicit killed %x0, debug-location !34
  
  bb.2.if.end:
    DBG_VALUE debug-use %sp, 0, !20, !36, debug-location !28
    %w8 = MOVZWi 0, 0
    %x0 = ORRXrs %xzr, undef %x8, 0, implicit killed %w8, debug-location !35
    %fp, %lr = LDPXi %sp, 2, debug-location !35 :: (load 8 from %stack.3), (load 8 from %stack.2)
    %sp = ADDXri %sp, 32, 0, debug-location !35
    RET undef %lr, implicit killed %w0, debug-location !35

...