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
4 ; Original C++ test case
8 ; int sum(int x, int y) {
14 ; while (i++ < 20000 * 20000)
15 ; if (i != 100) s = sum(i, s); else s = 30;
16 ; printf("sum is %d\n", s);
20 @.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
22 ; Function Attrs: nounwind uwtable
23 define i32 @_Z3sumii(i32 %x, i32 %y) !dbg !4 {
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
35 ; Function Attrs: uwtable
36 define i32 @main() !dbg !7 {
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
45 while.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 0x77f2798d / 0x80000000 = 93.71% [HOT edge]
52 ; CHECK: edge while.cond -> while.end probability is 0x080d8673 / 0x80000000 = 6.29%
54 while.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.
62 ; CHECK: edge while.body -> if.else probability is 0x0005b1e0 / 0x80000000 = 0.02%
63 ; CHECK: edge while.body -> if.then probability is 0x7ffa4e20 / 0x80000000 = 99.98% [HOT edge]
66 if.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
73 if.else: ; preds = %while.body
74 store i32 30, i32* %s, align 4, !dbg !20
77 if.end: ; preds = %if.else, %if.then
78 br label %while.cond, !dbg !22
80 while.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
86 declare i32 @printf(i8*, ...) #2
89 !llvm.module.flags = !{!8, !9}
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: ".")
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, retainedNodes: !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, retainedNodes: !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: 2, 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: 2, file: !1, scope: !17)
111 !20 = !DILocation(line: 10, scope: !21)
112 !21 = !DILexicalBlockFile(discriminator: 4, file: !1, scope: !17)
113 !22 = !DILocation(line: 10, scope: !23)
114 !23 = !DILexicalBlockFile(discriminator: 6, file: !1, scope: !17)
115 !24 = !DILocation(line: 11, scope: !7)
116 !25 = !DILocation(line: 12, scope: !7)