xref: /llvm-project/llvm/test/Transforms/SampleProfile/calls.ll (revision bb6497ffa6a88d1b3a32101d9b6519094d75ef2a)
1; RUN: opt < %s -passes="function(instcombine),sample-profile" -sample-profile-file=%S/Inputs/calls.prof | opt -passes='print<branch-prob>' -disable-output 2>&1 | 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@.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
20
21; Function Attrs: nounwind uwtable
22define i32 @_Z3sumii(i32 %x, i32 %y) #0 !dbg !4 {
23entry:
24  %x.addr = alloca i32, align 4
25  %y.addr = alloca i32, align 4
26  store i32 %x, ptr %x.addr, align 4
27  store i32 %y, ptr %y.addr, align 4
28  %0 = load i32, ptr %x.addr, align 4, !dbg !11
29  %1 = load i32, ptr %y.addr, align 4, !dbg !11
30  %add = add nsw i32 %0, %1, !dbg !11
31  ret i32 %add, !dbg !11
32}
33
34; Function Attrs: uwtable
35define i32 @main() #0 !dbg !7 {
36entry:
37  %retval = alloca i32, align 4
38  %s = alloca i32, align 4
39  %i = alloca i32, align 4
40  store i32 0, ptr %retval
41  store i32 0, ptr %i, align 4, !dbg !12
42  br label %while.cond, !dbg !13
43
44while.cond:                                       ; preds = %if.end, %entry
45  %0 = load i32, ptr %i, align 4, !dbg !14
46  %inc = add nsw i32 %0, 1, !dbg !14
47  store i32 %inc, ptr %i, align 4, !dbg !14
48  %cmp = icmp slt i32 %0, 400000000, !dbg !14
49  br i1 %cmp, label %while.body, label %while.end, !dbg !14
50; CHECK: edge %while.cond -> %while.body probability is 0x77f2798d / 0x80000000 = 93.71% [HOT edge]
51; CHECK: edge %while.cond -> %while.end probability is 0x080d8673 / 0x80000000 = 6.29%
52
53while.body:                                       ; preds = %while.cond
54  %1 = load i32, ptr %i, align 4, !dbg !16
55  %cmp1 = icmp ne i32 %1, 100, !dbg !16
56  br i1 %cmp1, label %if.then, label %if.else, !dbg !16
57; Without discriminator information, the profiler used to think that
58; both branches out of while.body had the same weight. In reality,
59; the edge while.body->if.then is taken most of the time.
60;
61; CHECK: edge %while.body -> %if.else probability is 0x0005b1e0 / 0x80000000 = 0.02%
62; CHECK: edge %while.body -> %if.then probability is 0x7ffa4e20 / 0x80000000 = 99.98% [HOT edge]
63
64
65if.then:                                          ; preds = %while.body
66  %2 = load i32, ptr %i, align 4, !dbg !18
67  %3 = load i32, ptr %s, align 4, !dbg !18
68  %call = call i32 @_Z3sumii(i32 %2, i32 %3), !dbg !18
69  store i32 %call, ptr %s, align 4, !dbg !18
70  br label %if.end, !dbg !18
71
72if.else:                                          ; preds = %while.body
73  store i32 30, ptr %s, align 4, !dbg !20
74  br label %if.end
75
76if.end:                                           ; preds = %if.else, %if.then
77  br label %while.cond, !dbg !22
78
79while.end:                                        ; preds = %while.cond
80  %4 = load i32, ptr %s, align 4, !dbg !24
81  %call2 = call i32 (ptr, ...) @printf(ptr @.str, i32 %4), !dbg !24
82  ret i32 0, !dbg !25
83}
84
85declare i32 @printf(ptr, ...) #2
86
87attributes #0 = {"use-sample-profile"}
88
89!llvm.dbg.cu = !{!0}
90!llvm.module.flags = !{!8, !9}
91!llvm.ident = !{!10}
92
93!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)
94!1 = !DIFile(filename: "calls.cc", directory: ".")
95!2 = !{}
96!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, retainedNodes: !2)
97!5 = !DIFile(filename: "calls.cc", directory: ".")
98!6 = !DISubroutineType(types: !2)
99!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, retainedNodes: !2)
100!8 = !{i32 2, !"Dwarf Version", i32 4}
101!9 = !{i32 1, !"Debug Info Version", i32 3}
102!10 = !{!"clang version 3.5 "}
103!11 = !DILocation(line: 4, scope: !4)
104!12 = !DILocation(line: 8, scope: !7)
105!13 = !DILocation(line: 9, scope: !7)
106!14 = !DILocation(line: 9, scope: !15)
107!15 = !DILexicalBlockFile(discriminator: 2, file: !1, scope: !7)
108!16 = !DILocation(line: 10, scope: !17)
109!17 = distinct !DILexicalBlock(line: 10, column: 0, file: !1, scope: !7)
110!18 = !DILocation(line: 10, scope: !19)
111!19 = !DILexicalBlockFile(discriminator: 2, file: !1, scope: !17)
112!20 = !DILocation(line: 10, scope: !21)
113!21 = !DILexicalBlockFile(discriminator: 4, file: !1, scope: !17)
114!22 = !DILocation(line: 10, scope: !23)
115!23 = !DILexicalBlockFile(discriminator: 6, file: !1, scope: !17)
116!24 = !DILocation(line: 11, scope: !7)
117!25 = !DILocation(line: 12, scope: !7)
118