1# RUN: llc -verify-machineinstrs -start-after=prologepilog -filetype=obj -o - %s | llvm-dwarfdump -v --debug-info - | FileCheck %s
2# CHECK: .debug_info contents:
3# CHECK: DW_TAG_variable
4# CHECK-NEXT: DW_AT_location {{.*}}         (DW_OP_reg1 RDX, DW_OP_bit_piece 0x8 0x8)
5# CHECK-NEXT: DW_AT_name {{.*}}"dh"
6--- |
7  ; Manually created after:
8  ; char f(int i) {
9  ;   char dh = i>>8;
10  ;   return dh;
11  ; }
12
13  target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
14  target triple = "x86_64-apple-macosx10.12.0"
15
16  define signext i8 @f(i32 %i) local_unnamed_addr #0 !dbg !7 {
17  entry:
18    tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !13, metadata !15), !dbg !16
19    %shr1 = lshr i32 %i, 8, !dbg !17
20    %conv = trunc i32 %shr1 to i8, !dbg !18
21    tail call void @llvm.dbg.value(metadata i8 %conv, i64 0, metadata !14, metadata !15), !dbg !19
22    ret i8 %conv, !dbg !20
23  }
24
25  declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #0
26
27  attributes #0 = { nounwind readnone }
28
29  !llvm.dbg.cu = !{!0}
30  !llvm.module.flags = !{!3, !4, !5}
31  !llvm.ident = !{!6}
32
33  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (trunk 288677) (llvm/trunk 288679)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
34  !1 = !DIFile(filename: "t.c", directory: "/")
35  !2 = !{}
36  !3 = !{i32 2, !"Dwarf Version", i32 4}
37  !4 = !{i32 2, !"Debug Info Version", i32 3}
38  !5 = !{i32 1, !"PIC Level", i32 2}
39  !6 = !{!"clang version 4.0.0 (trunk 288677) (llvm/trunk 288679)"}
40  !7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
41  !8 = !DISubroutineType(types: !9)
42  !9 = !{!10, !11}
43  !10 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
44  !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
45  !12 = !{!13, !14}
46  !13 = !DILocalVariable(name: "i", arg: 1, scope: !7, file: !1, line: 1, type: !11)
47  !14 = !DILocalVariable(name: "dh", scope: !7, file: !1, line: 2, type: !10)
48  !15 = !DIExpression()
49  !16 = !DILocation(line: 1, column: 12, scope: !7)
50  !17 = !DILocation(line: 2, column: 14, scope: !7)
51  !18 = !DILocation(line: 2, column: 13, scope: !7)
52  !19 = !DILocation(line: 2, column: 8, scope: !7)
53  !20 = !DILocation(line: 3, column: 3, scope: !7)
54
55...
56---
57name:            f
58alignment:       4
59exposesReturnsTwice: false
60legalized:       false
61regBankSelected: false
62selected:        false
63tracksRegLiveness: true
64liveins:
65  - { reg: '$edi' }
66frameInfo:
67  isFrameAddressTaken: false
68  isReturnAddressTaken: false
69  hasStackMap:     false
70  hasPatchPoint:   false
71  stackSize:       8
72  offsetAdjustment: 0
73  maxAlignment:    0
74  adjustsStack:    false
75  hasCalls:        false
76  maxCallFrameSize: 0
77  hasOpaqueSPAdjustment: false
78  hasVAStart:      false
79  hasMustTailInVarArgFunc: false
80fixedStack:
81  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16 }
82body:             |
83  bb.0.entry:
84    liveins: $edi, $rbp
85
86    frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp
87    CFI_INSTRUCTION def_cfa_offset 16
88    CFI_INSTRUCTION offset $rbp, -16
89    $rbp = frame-setup MOV64rr $rsp
90    CFI_INSTRUCTION def_cfa_register $rbp
91    DBG_VALUE debug-use $dh, debug-use _, !14, !15, debug-location !16
92    $edi = SHR32ri killed $edi, 8, implicit-def dead $eflags, debug-location !17
93    $eax = MOVSX32rr8 $dil, implicit killed $edi, debug-location !20
94    $rbp = POP64r implicit-def $rsp, implicit $rsp, debug-location !20
95    RETQ $eax, debug-location !20
96
97...
98