1# RUN: llc -mtriple=x86_64-unknown-unknown -run-pass=machine-sink -o - %s | FileCheck %s
2
3# Based on machinesink.mir. Verify that the sub-register index in the DBG_VALUE
4# instruction is cleared when marking the debug value undef.
5
6--- |
7  target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
8  target triple = "x86_64-unknown-linux-gnu"
9
10  @x = common local_unnamed_addr global i32 0, align 4
11
12  define void @test(i32* nocapture readonly %p) local_unnamed_addr !dbg !14 {
13  ; Stripped
14  entry:
15    br label %block1
16  block1:
17    br label %exit
18  exit:
19    ret void
20  }
21
22  !llvm.dbg.cu = !{!1}
23  !llvm.module.flags = !{!5, !6}
24  !llvm.ident = !{!7}
25
26  !1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !3)
27  !2 = !DIFile(filename: "t.c", directory: "")
28  !3 = !{}
29  !4 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
30  !5 = !{i32 2, !"Dwarf Version", i32 4}
31  !6 = !{i32 2, !"Debug Info Version", i32 3}
32  !7 = !{!"clang version 4.0.0 "}
33  !8 = !DISubroutineType(types: !9)
34  !9 = !{null, !10}
35  !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
36  !11 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !12)
37  !12 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
38  !13 = !DIExpression()
39  !14 = distinct !DISubprogram(name: "test", scope: !2, file: !2, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !1, retainedNodes: !15)
40  !15 = !{!16}
41  !16 = !DILocalVariable(name: "var", scope: !14, file: !2, line: 2, type: !12)
42  !17 = !DILocation(line: 1, column: 1, scope: !14)
43
44  ; CHECK: [[VAR:![0-9]+]] = !DILocalVariable(name: "var",
45
46...
47---
48name:            test
49tracksRegLiveness: true
50liveins:
51  - { reg: '$rdi', virtual-reg: '%2' }
52  - { reg: '$rsi', virtual-reg: '%2' }
53body:             |
54  bb.0.entry:
55    successors: %bb.1.block1, %bb.2.exit
56    liveins: $rdi, $esi
57
58    ; This block should _not_ have the first DBG_VALUE sunk out from it, as it
59    ; would pass a later DBG_VALUE of the same variable location. An undef
60    ; DBG_VALUE should be left behind though. Verify that the sub-register
61    ; index in the DBG_VALUE is cleared.
62    ; CHECK-LABEL: bb.0.entry:
63    ; CHECK:       [[TEST2VREG:%[0-9]+]]:gr64 = COPY $rdi
64    ; CHECK-NEXT:  CMP32ri $esi, 0
65    ; CHECK-NEXT:  DBG_VALUE $noreg, $noreg, [[VAR]]
66    ; CHECK-NEXT:  CMP32ri $esi, 0
67    ; CHECK-NEXT:  DBG_VALUE 0, $noreg, [[VAR]]
68    ; CHECK-NEXT:  JCC_1 %bb.1, 4
69    ; CHECK-NEXT:  JMP_1
70
71    %2:gr64 = COPY $rdi
72    %5:gr64 = ADD64ri8 %2, 1, implicit-def dead $eflags
73    CMP32ri $esi, 0, implicit-def $eflags
74    DBG_VALUE %5.sub_32bit, $noreg, !16, !13, debug-location !17
75    CMP32ri $esi, 0, implicit-def $eflags
76    DBG_VALUE 0, $noreg, !16, !13, debug-location !17
77    JCC_1 %bb.1.block1, 4, implicit $eflags
78    JMP_1 %bb.2.exit
79
80  bb.1.block1:
81    successors: %bb.2.exit
82
83    %1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags
84    JMP_1 %bb.2.exit
85
86  bb.2.exit:
87    $rax = MOV64rr %2
88    RET 0
89...
90