1; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/calls.prof | opt -analyze -branch-prob | FileCheck %s
2
3; Original C++ test case
4;
5; #include <stdio.h>
6;
7; int sum(int x, int y) {
8;   return x + y;
9; }
10;
11; int main() {
12;   int s, i = 0;
13;   while (i++ < 20000 * 20000)
14;     if (i != 100) s = sum(i, s); else s = 30;
15;   printf("sum is %d\n", s);
16;   return 0;
17; }
18;
19; Note that this test is missing the llvm.dbg.cu annotation. This emulates
20; the effect of the user having only used -fprofile-sample-use without
21; -gmlt when invoking the driver. In those cases, we need to track source
22; location information but we do not have to generate debug info in the
23; final binary.
24@.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
25
26; Function Attrs: nounwind uwtable
27define i32 @_Z3sumii(i32 %x, i32 %y) !dbg !4 {
28entry:
29  %x.addr = alloca i32, align 4
30  %y.addr = alloca i32, align 4
31  store i32 %x, i32* %x.addr, align 4
32  store i32 %y, i32* %y.addr, align 4
33  %0 = load i32, i32* %x.addr, align 4, !dbg !11
34  %1 = load i32, i32* %y.addr, align 4, !dbg !11
35  %add = add nsw i32 %0, %1, !dbg !11
36  ret i32 %add, !dbg !11
37}
38
39; Function Attrs: uwtable
40define i32 @main() !dbg !7 {
41entry:
42  %retval = alloca i32, align 4
43  %s = alloca i32, align 4
44  %i = alloca i32, align 4
45  store i32 0, i32* %retval
46  store i32 0, i32* %i, align 4, !dbg !12
47  br label %while.cond, !dbg !13
48
49while.cond:                                       ; preds = %if.end, %entry
50  %0 = load i32, i32* %i, align 4, !dbg !14
51  %inc = add nsw i32 %0, 1, !dbg !14
52  store i32 %inc, i32* %i, align 4, !dbg !14
53  %cmp = icmp slt i32 %0, 400000000, !dbg !14
54  br i1 %cmp, label %while.body, label %while.end, !dbg !14
55; CHECK: edge while.cond -> while.body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
56; CHECK: edge while.cond -> while.end probability is 0x00000000 / 0x80000000 = 0.00%
57
58while.body:                                       ; preds = %while.cond
59  %1 = load i32, i32* %i, align 4, !dbg !16
60  %cmp1 = icmp ne i32 %1, 100, !dbg !16
61  br i1 %cmp1, label %if.then, label %if.else, !dbg !16
62; Without discriminator information, the profiler used to think that
63; both branches out of while.body had the same weight. In reality,
64; the edge while.body->if.then is taken most of the time.
65;
66; CHECK: edge while.body -> if.then probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
67; CHECK: edge while.body -> if.else probability is 0x00000000 / 0x80000000 = 0.00%
68
69
70if.then:                                          ; preds = %while.body
71  %2 = load i32, i32* %i, align 4, !dbg !18
72  %3 = load i32, i32* %s, align 4, !dbg !18
73  %call = call i32 @_Z3sumii(i32 %2, i32 %3), !dbg !18
74  store i32 %call, i32* %s, align 4, !dbg !18
75  br label %if.end, !dbg !18
76
77if.else:                                          ; preds = %while.body
78  store i32 30, i32* %s, align 4, !dbg !20
79  br label %if.end
80
81if.end:                                           ; preds = %if.else, %if.then
82  br label %while.cond, !dbg !22
83
84while.end:                                        ; preds = %while.cond
85  %4 = load i32, i32* %s, align 4, !dbg !24
86  %call2 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i32 0, i32 0), i32 %4), !dbg !24
87  ret i32 0, !dbg !25
88}
89
90declare i32 @printf(i8*, ...) #2
91
92!llvm.module.flags = !{!8, !9}
93!llvm.ident = !{!10}
94
95!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
96!1 = !DIFile(filename: "calls.cc", directory: ".")
97!2 = !{}
98!3 = !{!4, !7}
99!4 = distinct !DISubprogram(name: "sum", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !1, scope: !5, type: !6, variables: !2)
100!5 = !DIFile(filename: "calls.cc", directory: ".")
101!6 = !DISubroutineType(types: !2)
102!7 = distinct !DISubprogram(name: "main", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 7, file: !1, scope: !5, type: !6, variables: !2)
103!8 = !{i32 2, !"Dwarf Version", i32 4}
104!9 = !{i32 1, !"Debug Info Version", i32 3}
105!10 = !{!"clang version 3.5 "}
106!11 = !DILocation(line: 4, scope: !4)
107!12 = !DILocation(line: 8, scope: !7)
108!13 = !DILocation(line: 9, scope: !7)
109!14 = !DILocation(line: 9, scope: !15)
110!15 = !DILexicalBlockFile(discriminator: 1, file: !1, scope: !7)
111!16 = !DILocation(line: 10, scope: !17)
112!17 = distinct !DILexicalBlock(line: 10, column: 0, file: !1, scope: !7)
113!18 = !DILocation(line: 10, scope: !19)
114!19 = !DILexicalBlockFile(discriminator: 1, file: !1, scope: !17)
115!20 = !DILocation(line: 10, scope: !21)
116!21 = !DILexicalBlockFile(discriminator: 2, file: !1, scope: !17)
117!22 = !DILocation(line: 10, scope: !23)
118!23 = !DILexicalBlockFile(discriminator: 3, file: !1, scope: !17)
119!24 = !DILocation(line: 11, scope: !7)
120!25 = !DILocation(line: 12, scope: !7)
121