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1# RUN: llc -mtriple=x86_64-none-linux-gnu -run-pass=postra-machine-sink -verify-machineinstrs  -o - %s | FileCheck %s
2#
3# This test was originally generated from the following sample:
4#
5# int x0;
6# extern void x3(int, int);
7# void x1(int x2) {
8#   if (x0)
9#     x3(0, x2);
10# }
11#
12# The code generates a COPY instruction which the PostRA Machine Sink pass will
13# try to sink.  Earlier versions were not performing the sink due to a
14# DBG_VALUE instruction confusing the sinking algorithm.
15
16--- |
17  @x0 = common dso_local global i32 0, align 4, !dbg !0
18
19  define dso_local void @x1(i32) !dbg !11 {
20    %2 = alloca i32, align 4
21    store i32 %0, i32* %2, align 4
22    call void @llvm.dbg.declare(metadata i32* %2, metadata !14, metadata !DIExpression()), !dbg !16
23    %3 = load i32, i32* @x0, align 4, !dbg !16
24    %4 = icmp ne i32 %3, 0, !dbg !16
25    br i1 %4, label %5, label %7, !dbg !16
26
27  ; <label>:5:                                      ; preds = %1
28    %6 = load i32, i32* %2, align 4, !dbg !16
29    call void @x3(i32 0, i32 %6), !dbg !16
30    br label %7, !dbg !16
31
32  ; <label>:7:                                      ; preds = %5, %1
33    ret void, !dbg !16
34  }
35
36  declare void @llvm.dbg.declare(metadata, metadata, metadata)
37  declare dso_local void @x3(i32, i32)
38
39  !llvm.dbg.cu = !{!2}
40  !llvm.module.flags = !{!7, !8}
41
42  !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
43  !1 = distinct !DIGlobalVariable(name: "x0", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
44  !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
45  !3 = !DIFile(filename: "test.c", directory: "")
46  !4 = !{}
47  !5 = !{!0}
48  !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
49  !7 = !{i32 2, !"Dwarf Version", i32 4}
50  !8 = !{i32 2, !"Debug Info Version", i32 3}
51  !11 = distinct !DISubprogram(name: "x1", scope: !3, file: !3, line: 3, type: !12, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !2)
52  !12 = !DISubroutineType(types: !13)
53  !13 = !{null, !6}
54  !14 = !DILocalVariable(name: "x2", arg: 1, scope: !11, file: !3, line: 3, type: !6)
55  !15 = distinct !DILexicalBlock(scope: !11, file: !3, line: 4, column: 7)
56  !16 = !DILocation(line: 4, column: 7, scope: !15)
57
58...
59---
60# CHECK: name: x1
61# CHECK: bb.0:
62# CHECK-NOT: $eax = COPY $edi
63# CHECK: bb.1:
64# CHECK: renamable $eax = COPY $edi
65# CHECK-NEXT: DBG_VALUE debug-use $eax,
66# CHECK: bb.2:
67name:            x1
68alignment:       4
69tracksRegLiveness: true
70body: |
71  bb.0:
72    successors: %bb.2, %bb.1; %bb.2, %bb.1
73    liveins: $edi
74    DBG_VALUE debug-use $edi, debug-use $noreg, !14, !DIExpression(), debug-location !16
75    renamable $eax = COPY $edi
76    DBG_VALUE debug-use $eax, debug-use $noreg, !14, !DIExpression(), debug-location !16
77    CMP32mi8 $rip, 1, $noreg, @x0, $noreg, 0, implicit-def $eflags, debug-location !16
78    JE_1 %bb.2, implicit killed $eflags, debug-location !16
79    JMP_1 %bb.1, debug-location !16
80
81  bb.1:
82    liveins: $eax
83    $edi = MOV32r0 implicit-def dead $eflags, debug-location !16
84    $esi = COPY killed renamable $eax, debug-location !16
85
86  bb.2:
87    RET 0, debug-location !16
88...
89