| ; 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 |
| |
| ; Original C++ test case |
| ; |
| ; #include <stdio.h> |
| ; |
| ; int sum(int x, int y) { |
| ; return x + y; |
| ; } |
| ; |
| ; int main() { |
| ; int s, i = 0; |
| ; while (i++ < 20000 * 20000) |
| ; if (i != 100) s = sum(i, s); else s = 30; |
| ; printf("sum is %d\n", s); |
| ; return 0; |
| ; } |
| ; |
| @.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1 |
| |
| ; Function Attrs: nounwind uwtable |
| define i32 @_Z3sumii(i32 %x, i32 %y) #0 !dbg !4 { |
| entry: |
| %x.addr = alloca i32, align 4 |
| %y.addr = alloca i32, align 4 |
| store i32 %x, i32* %x.addr, align 4 |
| store i32 %y, i32* %y.addr, align 4 |
| %0 = load i32, i32* %x.addr, align 4, !dbg !11 |
| %1 = load i32, i32* %y.addr, align 4, !dbg !11 |
| %add = add nsw i32 %0, %1, !dbg !11 |
| ret i32 %add, !dbg !11 |
| } |
| |
| ; Function Attrs: uwtable |
| define i32 @main() #0 !dbg !7 { |
| entry: |
| %retval = alloca i32, align 4 |
| %s = alloca i32, align 4 |
| %i = alloca i32, align 4 |
| store i32 0, i32* %retval |
| store i32 0, i32* %i, align 4, !dbg !12 |
| br label %while.cond, !dbg !13 |
| |
| while.cond: ; preds = %if.end, %entry |
| %0 = load i32, i32* %i, align 4, !dbg !14 |
| %inc = add nsw i32 %0, 1, !dbg !14 |
| store i32 %inc, i32* %i, align 4, !dbg !14 |
| %cmp = icmp slt i32 %0, 400000000, !dbg !14 |
| br i1 %cmp, label %while.body, label %while.end, !dbg !14 |
| ; CHECK: edge while.cond -> while.body probability is 0x77f2798d / 0x80000000 = 93.71% [HOT edge] |
| ; CHECK: edge while.cond -> while.end probability is 0x080d8673 / 0x80000000 = 6.29% |
| |
| while.body: ; preds = %while.cond |
| %1 = load i32, i32* %i, align 4, !dbg !16 |
| %cmp1 = icmp ne i32 %1, 100, !dbg !16 |
| br i1 %cmp1, label %if.then, label %if.else, !dbg !16 |
| ; Without discriminator information, the profiler used to think that |
| ; both branches out of while.body had the same weight. In reality, |
| ; the edge while.body->if.then is taken most of the time. |
| ; |
| ; CHECK: edge while.body -> if.else probability is 0x0005b1e0 / 0x80000000 = 0.02% |
| ; CHECK: edge while.body -> if.then probability is 0x7ffa4e20 / 0x80000000 = 99.98% [HOT edge] |
| |
| |
| if.then: ; preds = %while.body |
| %2 = load i32, i32* %i, align 4, !dbg !18 |
| %3 = load i32, i32* %s, align 4, !dbg !18 |
| %call = call i32 @_Z3sumii(i32 %2, i32 %3), !dbg !18 |
| store i32 %call, i32* %s, align 4, !dbg !18 |
| br label %if.end, !dbg !18 |
| |
| if.else: ; preds = %while.body |
| store i32 30, i32* %s, align 4, !dbg !20 |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| br label %while.cond, !dbg !22 |
| |
| while.end: ; preds = %while.cond |
| %4 = load i32, i32* %s, align 4, !dbg !24 |
| %call2 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i32 0, i32 0), i32 %4), !dbg !24 |
| ret i32 0, !dbg !25 |
| } |
| |
| declare i32 @printf(i8*, ...) #2 |
| |
| attributes #0 = {"use-sample-profile"} |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!8, !9} |
| !llvm.ident = !{!10} |
| |
| !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) |
| !1 = !DIFile(filename: "calls.cc", directory: ".") |
| !2 = !{} |
| !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) |
| !5 = !DIFile(filename: "calls.cc", directory: ".") |
| !6 = !DISubroutineType(types: !2) |
| !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) |
| !8 = !{i32 2, !"Dwarf Version", i32 4} |
| !9 = !{i32 1, !"Debug Info Version", i32 3} |
| !10 = !{!"clang version 3.5 "} |
| !11 = !DILocation(line: 4, scope: !4) |
| !12 = !DILocation(line: 8, scope: !7) |
| !13 = !DILocation(line: 9, scope: !7) |
| !14 = !DILocation(line: 9, scope: !15) |
| !15 = !DILexicalBlockFile(discriminator: 2, file: !1, scope: !7) |
| !16 = !DILocation(line: 10, scope: !17) |
| !17 = distinct !DILexicalBlock(line: 10, column: 0, file: !1, scope: !7) |
| !18 = !DILocation(line: 10, scope: !19) |
| !19 = !DILexicalBlockFile(discriminator: 2, file: !1, scope: !17) |
| !20 = !DILocation(line: 10, scope: !21) |
| !21 = !DILexicalBlockFile(discriminator: 4, file: !1, scope: !17) |
| !22 = !DILocation(line: 10, scope: !23) |
| !23 = !DILexicalBlockFile(discriminator: 6, file: !1, scope: !17) |
| !24 = !DILocation(line: 11, scope: !7) |
| !25 = !DILocation(line: 12, scope: !7) |