1# RUN: llc -O1 -filetype=asm -mtriple x86_64-unknown-linux-gnu -mcpu=x86-64 -o - %s  -start-before=simple-register-coalescing -stop-after=simple-register-coalescing | FileCheck %s
2
3--- |
4  target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
5  target triple = "x86_64-unknown-linux-gnu"
6
7  define i32 @main() local_unnamed_addr !dbg !14 {
8  entry:
9    %shl = shl i32 undef, undef, !dbg !19
10    tail call void @llvm.dbg.value(metadata i32 %shl, metadata !18, metadata !DIExpression()), !dbg !20
11    ret i32 %shl, !dbg !21
12  }
13
14  declare void @llvm.dbg.value(metadata, metadata, metadata)
15
16  !llvm.dbg.cu = !{!0}
17  !llvm.module.flags = !{!12, !13}
18
19  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2)
20  !1 = !DIFile(filename: "bar.c", directory: "")
21  !2 = !{}
22  !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
23  !12 = !{i32 2, !"Debug Info Version", i32 3}
24  !13 = !{i32 1, !"wchar_size", i32 4}
25  !14 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 12, type: !15, isLocal: false, isDefinition: true, scopeLine: 12, isOptimized: true, unit: !0, retainedNodes: !17)
26  !15 = !DISubroutineType(types: !16)
27  !16 = !{!7}
28  !17 = !{!18}
29  !18 = !DILocalVariable(name: "bazinga", scope: !14, file: !1, line: 13, type: !7)
30  !19 = !DILocalVariable(name: "bazinga2", scope: !14, file: !1, line: 13, type: !7)
31  !20 = !DILocation(line: 14, column: 11, scope: !14)
32  !21 = !DILocation(line: 13, column: 7, scope: !14)
33  !22 = !DILocation(line: 16, column: 3, scope: !14)
34
35...
36---
37name:            main
38alignment:       16
39registers:
40  - { id: 0, class: gr32, preferred-register: '' }
41body:             |
42  bb.0.entry:
43    %0 = MOV32r0 implicit-def dead $eflags, debug-location !20
44    DBG_VALUE %0, _, !18, !DIExpression(), debug-location !21
45    DBG_VALUE %0, _, !19, !DIExpression(), debug-location !22
46    $eax = COPY killed %0, debug-location !22
47    RET 0, killed $eax, debug-location !22
48
49...
50
51# CHECK: $eax = MOV32r0
52# CHECK-NEXT: DBG_VALUE $eax
53# CHECK-NEXT: DBG_VALUE $eax
54