1; RUN: opt -S -loop-fusion -pass-remarks-analysis=loop-fusion -disable-output < %s 2>&1 | FileCheck %s
2
3@B = common global [1024 x i32] zeroinitializer, align 16
4
5; CHECK: remark: diagnostics_analysis.c:6:3: [test]: Loop is not a candidate for fusion: Loop contains a volatile access
6; CHECK: remark: diagnostics_analysis.c:10:3: [test]: Loop is not a candidate for fusion: Loop has unknown trip count
7define void @test(i32* %A, i32 %n) !dbg !15 {
8entry:
9  %A.addr = alloca i32*, align 8
10  %n.addr = alloca i32, align 4
11  %i = alloca i32, align 4
12  %i1 = alloca i32, align 4
13  store i32* %A, i32** %A.addr, align 8
14  store i32 %n, i32* %n.addr, align 4
15  %0 = bitcast i32* %i to i8*
16  store i32 0, i32* %i, align 4
17  br label %for.cond
18
19for.cond:                                         ; preds = %for.inc, %entry
20  %1 = load i32, i32* %i, align 4
21  %2 = load i32, i32* %n.addr, align 4
22  %cmp = icmp slt i32 %1, %2
23  br i1 %cmp, label %for.body, label %for.cond.cleanup
24
25for.cond.cleanup:                                 ; preds = %for.cond
26  %3 = bitcast i32* %i to i8*, !dbg !42
27  br label %for.end
28
29for.body:                                         ; preds = %for.cond
30  %4 = load i32, i32* %i, align 4
31  %sub = sub nsw i32 %4, 3
32  %5 = load i32, i32* %i, align 4
33  %add = add nsw i32 %5, 3
34  %mul = mul nsw i32 %sub, %add
35  %6 = load i32, i32* %i, align 4
36  %rem = srem i32 %mul, %6
37  %7 = load i32*, i32** %A.addr, align 8
38  %8 = load i32, i32* %i, align 4
39  %idxprom = sext i32 %8 to i64
40  %arrayidx = getelementptr inbounds i32, i32* %7, i64 %idxprom
41  store volatile i32 %rem, i32* %arrayidx, align 4
42  br label %for.inc
43
44for.inc:                                          ; preds = %for.body
45  %9 = load i32, i32* %i, align 4, !dbg !49
46  %inc = add nsw i32 %9, 1, !dbg !49
47  store i32 %inc, i32* %i, align 4, !dbg !49
48  br label %for.cond, !dbg !42, !llvm.loop !50
49
50for.end:                                          ; preds = %for.cond.cleanup
51  %10 = bitcast i32* %i1 to i8*
52  store i32 0, i32* %i1, align 4
53  br label %for.cond2
54
55for.cond2:                                        ; preds = %for.inc12, %for.end
56  %11 = load i32, i32* %i1, align 4
57  %12 = load i32, i32* %n.addr, align 4
58  %cmp3 = icmp slt i32 %11, %12
59  br i1 %cmp3, label %for.body5, label %for.cond.cleanup4
60
61for.cond.cleanup4:                                ; preds = %for.cond2
62  %13 = bitcast i32* %i1 to i8*
63  br label %for.end14
64
65for.body5:                                        ; preds = %for.cond2
66  %14 = load i32, i32* %i1, align 4
67  %sub6 = sub nsw i32 %14, 3
68  %15 = load i32, i32* %i1, align 4
69  %add7 = add nsw i32 %15, 3
70  %mul8 = mul nsw i32 %sub6, %add7
71  %16 = load i32, i32* %i1, align 4
72  %rem9 = srem i32 %mul8, %16
73  %17 = load i32, i32* %i1, align 4
74  %idxprom10 = sext i32 %17 to i64
75  %arrayidx11 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %idxprom10
76  store i32 %rem9, i32* %arrayidx11, align 4
77  br label %for.inc12
78
79for.inc12:                                        ; preds = %for.body5
80  %18 = load i32, i32* %i1, align 4
81  %inc13 = add nsw i32 %18, 1
82  store i32 %inc13, i32* %i1, align 4
83  br label %for.cond2, !dbg !59, !llvm.loop !67
84
85for.end14:                                        ; preds = %for.cond.cleanup4
86  ret void
87}
88
89!llvm.module.flags = !{!10, !11, !13}
90!llvm.ident = !{!14}
91
92!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
93!1 = distinct !DIGlobalVariable(name: "B", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
94!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 9.0.0 ([email protected]:compiler/llvm-project.git c019c32c5a2b0ed4487a738337d35fd3f630ac0a)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: GNU)
95!3 = !DIFile(filename: "diagnostics_analysis.c", directory: "/tmp")
96!4 = !{}
97!5 = !{!0}
98!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 32768, elements: !8)
99!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
100!8 = !{!9}
101!9 = !DISubrange(count: 1024)
102!10 = !{i32 2, !"Dwarf Version", i32 4}
103!11 = !{i32 2, !"Debug Info Version", i32 3}
104!13 = !{i32 7, !"PIC Level", i32 2}
105!14 = !{!"clang version 9.0.0 ([email protected]:compiler/llvm-project.git c019c32c5a2b0ed4487a738337d35fd3f630ac0a)"}
106!15 = distinct !DISubprogram(name: "test", scope: !3, file: !3, line: 5, type: !16, scopeLine: 5, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !20)
107!16 = !DISubroutineType(types: !17)
108!17 = !{null, !18, !7}
109!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
110!19 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)
111!20 = !{!21, !22, !23, !25}
112!21 = !DILocalVariable(name: "A", arg: 1, scope: !15, file: !3, line: 5, type: !18)
113!22 = !DILocalVariable(name: "n", arg: 2, scope: !15, file: !3, line: 5, type: !7)
114!23 = !DILocalVariable(name: "i", scope: !24, file: !3, line: 6, type: !7)
115!24 = distinct !DILexicalBlock(scope: !15, file: !3, line: 6, column: 3)
116!25 = !DILocalVariable(name: "i", scope: !26, file: !3, line: 10, type: !7)
117!26 = distinct !DILexicalBlock(scope: !15, file: !3, line: 10, column: 3)
118!38 = distinct !DILexicalBlock(scope: !24, file: !3, line: 6, column: 3)
119!41 = !DILocation(line: 6, column: 3, scope: !24)
120!42 = !DILocation(line: 6, column: 3, scope: !38)
121!44 = distinct !DILexicalBlock(scope: !38, file: !3, line: 6, column: 31)
122!49 = !DILocation(line: 6, column: 27, scope: !38)
123!50 = distinct !{!50, !41, !51}
124!51 = !DILocation(line: 8, column: 3, scope: !24)
125!55 = distinct !DILexicalBlock(scope: !26, file: !3, line: 10, column: 3)
126!58 = !DILocation(line: 10, column: 3, scope: !26)
127!59 = !DILocation(line: 10, column: 3, scope: !55)
128!67 = distinct !{!67, !58, !68}
129!68 = !DILocation(line: 12, column: 3, scope: !26)
130!69 = !DILocation(line: 13, column: 1, scope: !15)
131