1; RUN: opt -instcombine < %s -S | FileCheck %s
2
3; This tests dbg.declare lowering for CallInst users of an alloca. The
4; resulting dbg.value expressions should add a deref to the declare's expression.
5
6; Hand-reduced from this example (-g -Og -mllvm -disable-llvm-optzns -gno-column-info):
7
8; static volatile int sink;
9; static void escape(int &c) { sink = c; }
10; static bool empty ( int p1 ) { return p1 == 0; }
11; int main() {
12;   int d1 = 42;
13;   while (!empty(d1))
14;     escape(d1);
15;   return 0;
16; }
17
18target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
19target triple = "x86_64-unknown-linux-gnu"
20
21@_ZL4sink = internal global i32 0, align 4, !dbg !0
22
23; CHECK-LABEL: @main
24define dso_local i32 @main() !dbg !12 {
25entry:
26  %retval = alloca i32, align 4
27  %d1 = alloca i32, align 4
28  store i32 0, i32* %retval, align 4
29  %0 = bitcast i32* %d1 to i8*, !dbg !17
30  call void @llvm.lifetime.start.p0i8(i64 4, i8* %0) #4, !dbg !17
31; CHECK: dbg.value(metadata i32 42, metadata [[METADATA_IDX1:![0-9]+]], metadata !DIExpression())
32; CHECK-NEXT: store
33  call void @llvm.dbg.declare(metadata i32* %d1, metadata !16, metadata !DIExpression()), !dbg !17
34  store i32 42, i32* %d1, align 4, !dbg !17
35  br label %while.cond, !dbg !22
36
37while.cond:                                       ; preds = %while.body, %entry
38; CHECK: dbg.value(metadata i32 %1, metadata [[METADATA_IDX1]], metadata !DIExpression())
39; CHECK-NEXT: call zeroext i1 @_ZL5emptyi
40  %1 = load i32, i32* %d1, align 4, !dbg !22
41  %call = call zeroext i1 @_ZL5emptyi(i32 %1), !dbg !22
42  %lnot = xor i1 %call, true, !dbg !22
43  br i1 %lnot, label %while.body, label %while.end, !dbg !22
44
45while.body:                                       ; preds = %while.cond
46; CHECK: dbg.value(metadata i32* %d1, metadata [[METADATA_IDX1]], metadata !DIExpression(DW_OP_deref))
47; CHECK-NEXT: call void @_ZL6escapeRi
48  call void @_ZL6escapeRi(i32* dereferenceable(4) %d1), !dbg !23
49  br label %while.cond, !dbg !22, !llvm.loop !24
50
51while.end:                                        ; preds = %while.cond
52  %2 = bitcast i32* %d1 to i8*, !dbg !25
53  call void @llvm.lifetime.end.p0i8(i64 4, i8* %2) #4, !dbg !25
54  ret i32 0, !dbg !26
55}
56
57declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
58
59declare void @llvm.dbg.declare(metadata, metadata, metadata)
60
61define internal zeroext i1 @_ZL5emptyi(i32 %p1) !dbg !27 {
62  ret i1 false
63}
64
65define internal void @_ZL6escapeRi(i32* dereferenceable(4) %c) #3 !dbg !34 {
66  ret void
67}
68
69declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
70
71!llvm.dbg.cu = !{!2}
72!llvm.module.flags = !{!8, !9, !10}
73!llvm.ident = !{!11}
74
75; CHECK: DIGlobalVariableExpression
76; CHECK: [[METADATA_IDX1]] = !DILocalVariable(name: "d1"
77
78!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
79!1 = distinct !DIGlobalVariable(name: "sink", linkageName: "_ZL4sink", scope: !2, file: !3, line: 2, type: !6, isLocal: true, isDefinition: true)
80!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
81!3 = !DIFile(filename: "lower-dbg-declare.cpp", directory: "")
82!4 = !{}
83!5 = !{!0}
84!6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)
85!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
86!8 = !{i32 2, !"Dwarf Version", i32 4}
87!9 = !{i32 2, !"Debug Info Version", i32 3}
88!10 = !{i32 1, !"wchar_size", i32 4}
89!11 = !{!"clang"}
90!12 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 5, type: !13, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !15)
91!13 = !DISubroutineType(types: !14)
92!14 = !{!7}
93!15 = !{!16}
94!16 = !DILocalVariable(name: "d1", scope: !12, file: !3, line: 6, type: !7)
95!17 = !DILocation(line: 6, scope: !12)
96!22 = !DILocation(line: 7, scope: !12)
97!23 = !DILocation(line: 8, scope: !12)
98!24 = distinct !{!24, !22, !23}
99!25 = !DILocation(line: 10, scope: !12)
100!26 = !DILocation(line: 9, scope: !12)
101!27 = distinct !DISubprogram(name: "empty", linkageName: "_ZL5emptyi", scope: !3, file: !3, line: 4, type: !28, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !31)
102!28 = !DISubroutineType(types: !29)
103!29 = !{!30, !7}
104!30 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
105!31 = !{!32}
106!32 = !DILocalVariable(name: "p1", arg: 1, scope: !27, file: !3, line: 4, type: !7)
107!33 = !DILocation(line: 4, scope: !27)
108!34 = distinct !DISubprogram(name: "escape", linkageName: "_ZL6escapeRi", scope: !3, file: !3, line: 3, type: !35, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !38)
109!35 = !DISubroutineType(types: !36)
110!36 = !{null, !37}
111!37 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !7, size: 64)
112!38 = !{!39}
113!39 = !DILocalVariable(name: "c", arg: 1, scope: !34, file: !3, line: 3, type: !37)
114!42 = !DILocation(line: 3, scope: !34)
115