1
2; RUN: opt < %s -instcombine -verify -S -o - | FileCheck %s
3
4; Hand-reduced from this example.
5; -g -O -mllvm -disable-llvm-optzns -gno-column-info
6; plus opt -sroa -instcombine -inline
7
8; #include <stdio.h>
9;
10; struct S1 {
11;     int p1;
12;     int p2;
13;
14;     bool IsNull (  ) {
15;         return p1 == 0;
16;     }
17; };
18;
19; S1 foo ( void );
20;
21; int bar (  ) {
22;
23;     S1 result = foo();
24;
25;     if ( result.IsNull() )
26;         return 0;
27;
28;     result.p1 = 2;
29;     result.p2 = 3;
30;
31;     int* ptr = &result.p1;
32;
33;     printf("%d", *ptr);
34;     printf("%d", *(ptr+1));
35;
36;     return result.p1 + 1;
37; }
38
39; CHECK: _Z3barv
40; CHECK: llvm.dbg.declare(metadata i64* %{{.*}}, metadata [[METADATA_IDX1:![0-9]+]]
41; CHECK-NOT: llvm.dbg.declare(metadata %struct.S1* %{{.*}}, metadata [[METADATA_IDX1]]
42; CHECK: ret
43; CHECK: DICompileUnit
44; CHECK: [[METADATA_IDX1]] = !DILocalVariable(name: "result"
45
46target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
47target triple = "x86_64-unknown-linux-gnu"
48
49%struct.S1 = type { i32, i32 }
50
51@.str = private unnamed_addr constant [3 x i8] c"%d\00", align 1
52
53define dso_local i32 @_Z3barv() !dbg !7 {
54entry:
55  %result = alloca i64, align 8
56  %tmpcast = bitcast i64* %result to %struct.S1*
57  %0 = bitcast i64* %result to i8*, !dbg !24
58  call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %0) #4, !dbg !24
59  call void @llvm.dbg.declare(metadata %struct.S1* %tmpcast, metadata !12, metadata !DIExpression()), !dbg !24
60  %call = call i64 @_Z3foov(), !dbg !24
61  store i64 %call, i64* %result, align 8, !dbg !24
62  call void @llvm.dbg.value(metadata %struct.S1* %tmpcast, metadata !25, metadata !DIExpression()), !dbg !29
63  %p1.i = getelementptr inbounds %struct.S1, %struct.S1* %tmpcast, i64 0, i32 0, !dbg !32
64  %1 = load i32, i32* %p1.i, align 4, !dbg !32
65  %cmp.i = icmp eq i32 %1, 0, !dbg !32
66  br i1 %cmp.i, label %if.then, label %if.end, !dbg !38
67
68if.then:                                          ; preds = %entry
69  br label %cleanup, !dbg !38
70
71if.end:                                           ; preds = %entry
72
73  %p1 = bitcast i64* %result to i32*, !dbg !38
74  store i32 2, i32* %p1, align 8, !dbg !38
75  %p2 = getelementptr inbounds %struct.S1, %struct.S1* %tmpcast, i64 0, i32 1, !dbg !38
76  store i32 3, i32* %p2, align 4, !dbg !38
77  %p12 = bitcast i64* %result to i32*, !dbg !38
78  call void @llvm.dbg.value(metadata i32* %p12, metadata !22, metadata !DIExpression()), !dbg !38
79  %call3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 2), !dbg !38
80  %add.ptr = getelementptr inbounds i32, i32* %p12, i64 1, !dbg !38
81  %2 = load i32, i32* %add.ptr, align 4, !dbg !38
82  %call4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %2), !dbg !38
83  %p15 = bitcast i64* %result to i32*, !dbg !38
84  %3 = load i32, i32* %p15, align 8, !dbg !38
85  %add = add nsw i32 %3, 1, !dbg !38
86  br label %cleanup
87
88cleanup:                                          ; preds = %if.end, %if.then
89  %retval.0 = phi i32 [ 0, %if.then ], [ %add, %if.end ], !dbg !38
90  %4 = bitcast i64* %result to i8*, !dbg !38
91  call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %4) #4, !dbg !38
92  ret i32 %retval.0, !dbg !38
93}
94
95declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
96
97declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
98
99declare dso_local i64 @_Z3foov() #3
100
101declare dso_local i32 @printf(i8*, ...) #3
102
103declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
104
105declare void @llvm.dbg.value(metadata, metadata, metadata) #2
106
107!llvm.dbg.cu = !{!0}
108!llvm.module.flags = !{!3, !4, !5}
109!llvm.ident = !{!6}
110
111!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
112!1 = !DIFile(filename: "test.cpp", directory: "")
113!2 = !{}
114!3 = !{i32 2, !"Dwarf Version", i32 4}
115!4 = !{i32 2, !"Debug Info Version", i32 3}
116!5 = !{i32 1, !"wchar_size", i32 4}
117!6 = !{!"clang"}
118!7 = distinct !DISubprogram(name: "bar", linkageName: "_Z3barv", scope: !1, file: !1, line: 15, type: !8, scopeLine: 15, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
119!8 = !DISubroutineType(types: !9)
120!9 = !{!10}
121!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
122!11 = !{!12, !22}
123!12 = !DILocalVariable(name: "result", scope: !7, file: !1, line: 17, type: !13)
124!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S1", file: !1, line: 4, size: 64, flags: DIFlagTypePassByValue, elements: !14, identifier: "_ZTS2S1")
125!14 = !{!15, !16, !17}
126!15 = !DIDerivedType(tag: DW_TAG_member, name: "p1", scope: !13, file: !1, line: 5, baseType: !10, size: 32)
127!16 = !DIDerivedType(tag: DW_TAG_member, name: "p2", scope: !13, file: !1, line: 6, baseType: !10, size: 32, offset: 32)
128!17 = !DISubprogram(name: "IsNull", linkageName: "_ZN2S16IsNullEv", scope: !13, file: !1, line: 8, type: !18, scopeLine: 8, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
129!18 = !DISubroutineType(types: !19)
130!19 = !{!20, !21}
131!20 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
132!21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
133!22 = !DILocalVariable(name: "ptr", scope: !7, file: !1, line: 25, type: !23)
134!23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
135!24 = !DILocation(line: 17, scope: !7)
136!25 = !DILocalVariable(name: "this", arg: 1, scope: !26, type: !28, flags: DIFlagArtificial | DIFlagObjectPointer)
137!26 = distinct !DISubprogram(name: "IsNull", linkageName: "_ZN2S16IsNullEv", scope: !13, file: !1, line: 8, type: !18, scopeLine: 8, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, declaration: !17, retainedNodes: !27)
138!27 = !{!25}
139!28 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
140!29 = !DILocation(line: 0, scope: !26, inlinedAt: !30)
141!30 = distinct !DILocation(line: 19, scope: !31)
142!31 = distinct !DILexicalBlock(scope: !7, file: !1, line: 19)
143!32 = !DILocation(line: 9, scope: !26, inlinedAt: !30)
144!38 = !DILocation(line: 0, scope: !7)
145