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 27 define i32 @_Z3sumii(i32 %x, i32 %y) !dbg !4 { 28 entry: 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 40 define i32 @main() !dbg !7 { 41 entry: 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 49 while.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 58 while.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 70 if.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 77 if.else: ; preds = %while.body 78 store i32 30, i32* %s, align 4, !dbg !20 79 br label %if.end 80 81 if.end: ; preds = %if.else, %if.then 82 br label %while.cond, !dbg !22 83 84 while.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 90 declare 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
