1; RUN: opt < %s -instcombine -sample-profile -sample-profile-file=%S/Inputs/calls.prof | opt -analyze -branch-prob | FileCheck %s
2; RUN: opt < %s -passes="function(instcombine),sample-profile" -sample-profile-file=%S/Inputs/calls.prof | opt -analyze -branch-prob | FileCheck %s
3
4; Original C++ test case
5;
6; #include <stdio.h>
7;
8; int sum(int x, int y) {
9;   return x + y;
10; }
11;
12; int main() {
13;   int s, i = 0;
14;   while (i++ < 20000 * 20000)
15;     if (i != 100) s = sum(i, s); else s = 30;
16;   printf("sum is %d\n", s);
17;   return 0;
18; }
19;
20@.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
21
22; Function Attrs: nounwind uwtable
23define i32 @_Z3sumii(i32 %x, i32 %y) !dbg !4 {
24entry:
25  %x.addr = alloca i32, align 4
26  %y.addr = alloca i32, align 4
27  store i32 %x, i32* %x.addr, align 4
28  store i32 %y, i32* %y.addr, align 4
29  %0 = load i32, i32* %x.addr, align 4, !dbg !11
30  %1 = load i32, i32* %y.addr, align 4, !dbg !11
31  %add = add nsw i32 %0, %1, !dbg !11
32  ret i32 %add, !dbg !11
33}
34
35; Function Attrs: uwtable
36define i32 @main() !dbg !7 {
37entry:
38  %retval = alloca i32, align 4
39  %s = alloca i32, align 4
40  %i = alloca i32, align 4
41  store i32 0, i32* %retval
42  store i32 0, i32* %i, align 4, !dbg !12
43  br label %while.cond, !dbg !13
44
45while.cond:                                       ; preds = %if.end, %entry
46  %0 = load i32, i32* %i, align 4, !dbg !14
47  %inc = add nsw i32 %0, 1, !dbg !14
48  store i32 %inc, i32* %i, align 4, !dbg !14
49  %cmp = icmp slt i32 %0, 400000000, !dbg !14
50  br i1 %cmp, label %while.body, label %while.end, !dbg !14
51; CHECK: edge while.cond -> while.body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
52; CHECK: edge while.cond -> while.end probability is 0x00000000 / 0x80000000 = 0.00%
53
54while.body:                                       ; preds = %while.cond
55  %1 = load i32, i32* %i, align 4, !dbg !16
56  %cmp1 = icmp ne i32 %1, 100, !dbg !16
57  br i1 %cmp1, label %if.then, label %if.else, !dbg !16
58; Without discriminator information, the profiler used to think that
59; both branches out of while.body had the same weight. In reality,
60; the edge while.body->if.then is taken most of the time.
61;
62; CHECK: edge while.body -> if.else probability is 0x00000000 / 0x80000000 = 0.00%
63; CHECK: edge while.body -> if.then probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
64
65
66if.then:                                          ; preds = %while.body
67  %2 = load i32, i32* %i, align 4, !dbg !18
68  %3 = load i32, i32* %s, align 4, !dbg !18
69  %call = call i32 @_Z3sumii(i32 %2, i32 %3), !dbg !18
70  store i32 %call, i32* %s, align 4, !dbg !18
71  br label %if.end, !dbg !18
72
73if.else:                                          ; preds = %while.body
74  store i32 30, i32* %s, align 4, !dbg !20
75  br label %if.end
76
77if.end:                                           ; preds = %if.else, %if.then
78  br label %while.cond, !dbg !22
79
80while.end:                                        ; preds = %while.cond
81  %4 = load i32, i32* %s, align 4, !dbg !24
82  %call2 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i32 0, i32 0), i32 %4), !dbg !24
83  ret i32 0, !dbg !25
84}
85
86declare i32 @printf(i8*, ...) #2
87
88!llvm.dbg.cu = !{!0}
89!llvm.module.flags = !{!8, !9}
90!llvm.ident = !{!10}
91
92!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: NoDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
93!1 = !DIFile(filename: "calls.cc", directory: ".")
94!2 = !{}
95!4 = distinct !DISubprogram(name: "sum", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, variables: !2)
96!5 = !DIFile(filename: "calls.cc", directory: ".")
97!6 = !DISubroutineType(types: !2)
98!7 = distinct !DISubprogram(name: "main", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !5, type: !6, variables: !2)
99!8 = !{i32 2, !"Dwarf Version", i32 4}
100!9 = !{i32 1, !"Debug Info Version", i32 3}
101!10 = !{!"clang version 3.5 "}
102!11 = !DILocation(line: 4, scope: !4)
103!12 = !DILocation(line: 8, scope: !7)
104!13 = !DILocation(line: 9, scope: !7)
105!14 = !DILocation(line: 9, scope: !15)
106!15 = !DILexicalBlockFile(discriminator: 1, file: !1, scope: !7)
107!16 = !DILocation(line: 10, scope: !17)
108!17 = distinct !DILexicalBlock(line: 10, column: 0, file: !1, scope: !7)
109!18 = !DILocation(line: 10, scope: !19)
110!19 = !DILexicalBlockFile(discriminator: 1, file: !1, scope: !17)
111!20 = !DILocation(line: 10, scope: !21)
112!21 = !DILexicalBlockFile(discriminator: 2, file: !1, scope: !17)
113!22 = !DILocation(line: 10, scope: !23)
114!23 = !DILexicalBlockFile(discriminator: 3, file: !1, scope: !17)
115!24 = !DILocation(line: 11, scope: !7)
116!25 = !DILocation(line: 12, scope: !7)
117