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llvm-mirror/test/Transforms/SampleProfile/branch.ll
Shiva Chen a2029fa58e [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 
In order to set breakpoints on labels and list source code around
labels, we need collect debug information for labels, i.e., label
name, the function label belong, line number in the file, and the
address label located. In order to keep these information in LLVM
IR and to allow backend to generate debug information correctly.
We create a new kind of metadata for labels, DILabel. The format
of DILabel is

!DILabel(scope: !1, name: "foo", file: !2, line: 3)

We hope to keep debug information as much as possible even the
code is optimized. So, we create a new kind of intrinsic for label
metadata to avoid the metadata is eliminated with basic block.
The intrinsic will keep existing if we keep it from optimized out.
The format of the intrinsic is

llvm.dbg.label(metadata !1)

It has only one argument, that is the DILabel metadata. The
intrinsic will follow the label immediately. Backend could get the
label metadata through the intrinsic's parameter.

We also create DIBuilder API for labels to be used by Frontend.
Frontend could use createLabel() to allocate DILabel objects, and use
insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR.

Differential Revision: https://reviews.llvm.org/D45024

Patch by Hsiangkai Wang.

llvm-svn: 331841
2018-05-09 02:40:45 +00:00

243 lines
12 KiB
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; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/branch.prof | opt -analyze -branch-prob | FileCheck %s
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/branch.prof | opt -analyze -branch-prob | FileCheck %s
; Original C++ code for this test case:
;
; #include <stdio.h>
; #include <stdlib.h>
; int main(int argc, char *argv[]) {
; if (argc < 2)
; return 1;
; double result;
; int limit = atoi(argv[1]);
; if (limit > 100) {
; double s = 23.041968 * atoi(argv[2]);
; for (int u = 0; u < limit; u++) {
; double x = s;
; s = x + 3.049 + (double)u;
; s -= s + 3.94 / x * 0.32;
; }
; result = s;
; } else {
; result = atoi(argv[2]);
; }
; printf("result is %lf\n", result);
; return 0;
; }
@.str = private unnamed_addr constant [15 x i8] c"result is %lf\0A\00", align 1
; Function Attrs: uwtable
define i32 @main(i32 %argc, i8** %argv) #0 !dbg !6 {
; CHECK: Printing analysis 'Branch Probability Analysis' for function 'main':
entry:
%retval = alloca i32, align 4
%argc.addr = alloca i32, align 4
%argv.addr = alloca i8**, align 8
%result = alloca double, align 8
%limit = alloca i32, align 4
%s = alloca double, align 8
%u = alloca i32, align 4
%x = alloca double, align 8
store i32 0, i32* %retval, align 4
store i32 %argc, i32* %argc.addr, align 4
call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !16, metadata !17), !dbg !18
store i8** %argv, i8*** %argv.addr, align 8
call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !19, metadata !17), !dbg !20
%0 = load i32, i32* %argc.addr, align 4, !dbg !21
%cmp = icmp slt i32 %0, 2, !dbg !23
br i1 %cmp, label %if.then, label %if.end, !dbg !24
; CHECK: edge entry -> if.then probability is 0x4ccf6b16 / 0x80000000 = 60.01%
; CHECK: edge entry -> if.end probability is 0x333094ea / 0x80000000 = 39.99%
if.then: ; preds = %entry
store i32 1, i32* %retval, align 4, !dbg !25
br label %return, !dbg !25
if.end: ; preds = %entry
call void @llvm.dbg.declare(metadata double* %result, metadata !26, metadata !17), !dbg !27
call void @llvm.dbg.declare(metadata i32* %limit, metadata !28, metadata !17), !dbg !29
%1 = load i8**, i8*** %argv.addr, align 8, !dbg !30
%arrayidx = getelementptr inbounds i8*, i8** %1, i64 1, !dbg !30
%2 = load i8*, i8** %arrayidx, align 8, !dbg !30
%call = call i32 @atoi(i8* %2) #4, !dbg !31
store i32 %call, i32* %limit, align 4, !dbg !29
%3 = load i32, i32* %limit, align 4, !dbg !32
%cmp1 = icmp sgt i32 %3, 100, !dbg !34
br i1 %cmp1, label %if.then.2, label %if.else, !dbg !35
; CHECK: edge if.end -> if.then.2 probability is 0x6652c748 / 0x80000000 = 79.94%
; CHECK: edge if.end -> if.else probability is 0x19ad38b8 / 0x80000000 = 20.06%
if.then.2: ; preds = %if.end
call void @llvm.dbg.declare(metadata double* %s, metadata !36, metadata !17), !dbg !38
%4 = load i8**, i8*** %argv.addr, align 8, !dbg !39
%arrayidx3 = getelementptr inbounds i8*, i8** %4, i64 2, !dbg !39
%5 = load i8*, i8** %arrayidx3, align 8, !dbg !39
%call4 = call i32 @atoi(i8* %5) #4, !dbg !40
%conv = sitofp i32 %call4 to double, !dbg !40
%mul = fmul double 0x40370ABE6A337A81, %conv, !dbg !41
store double %mul, double* %s, align 8, !dbg !38
call void @llvm.dbg.declare(metadata i32* %u, metadata !42, metadata !17), !dbg !44
store i32 0, i32* %u, align 4, !dbg !44
br label %for.cond, !dbg !45
for.cond: ; preds = %for.inc, %if.then.2
%6 = load i32, i32* %u, align 4, !dbg !46
%7 = load i32, i32* %limit, align 4, !dbg !48
%cmp5 = icmp slt i32 %6, %7, !dbg !49
br i1 %cmp5, label %for.body, label %for.end, !dbg !50, !prof !80
; CHECK: edge for.cond -> for.body probability is 0x73333333 / 0x80000000 = 90.00%
; CHECK: edge for.cond -> for.end probability is 0x0ccccccd / 0x80000000 = 10.00%
for.body: ; preds = %for.cond
call void @llvm.dbg.declare(metadata double* %x, metadata !51, metadata !17), !dbg !53
%8 = load double, double* %s, align 8, !dbg !54
store double %8, double* %x, align 8, !dbg !53
%9 = load double, double* %x, align 8, !dbg !55
%add = fadd double %9, 3.049000e+00, !dbg !56
%10 = load i32, i32* %u, align 4, !dbg !57
%conv6 = sitofp i32 %10 to double, !dbg !57
%add7 = fadd double %add, %conv6, !dbg !58
store double %add7, double* %s, align 8, !dbg !59
%11 = load double, double* %s, align 8, !dbg !60
%12 = load double, double* %x, align 8, !dbg !61
%div = fdiv double 3.940000e+00, %12, !dbg !62
%mul8 = fmul double %div, 3.200000e-01, !dbg !63
%add9 = fadd double %11, %mul8, !dbg !64
%13 = load double, double* %s, align 8, !dbg !65
%sub = fsub double %13, %add9, !dbg !65
store double %sub, double* %s, align 8, !dbg !65
br label %for.inc, !dbg !66
for.inc: ; preds = %for.body
%14 = load i32, i32* %u, align 4, !dbg !67
%inc = add nsw i32 %14, 1, !dbg !67
store i32 %inc, i32* %u, align 4, !dbg !67
br label %for.cond, !dbg !68
for.end: ; preds = %for.cond
%15 = load double, double* %s, align 8, !dbg !69
store double %15, double* %result, align 8, !dbg !70
br label %if.end.13, !dbg !71
if.else: ; preds = %if.end
%16 = load i8**, i8*** %argv.addr, align 8, !dbg !72
%arrayidx10 = getelementptr inbounds i8*, i8** %16, i64 2, !dbg !72
%17 = load i8*, i8** %arrayidx10, align 8, !dbg !72
%call11 = call i32 @atoi(i8* %17) #4, !dbg !74
%conv12 = sitofp i32 %call11 to double, !dbg !74
store double %conv12, double* %result, align 8, !dbg !75
br label %if.end.13
if.end.13: ; preds = %if.else, %for.end
%18 = load double, double* %result, align 8, !dbg !76
%call14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i32 0, i32 0), double %18), !dbg !77
store i32 0, i32* %retval, align 4, !dbg !78
br label %return, !dbg !78
return: ; preds = %if.end.13, %if.then
%19 = load i32, i32* %retval, align 4, !dbg !79
ret i32 %19, !dbg !79
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: nounwind readonly
declare i32 @atoi(i8*) #2
declare i32 @printf(i8*, ...) #3
attributes #0 = { uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind readonly "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #3 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #4 = { nounwind readonly }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!13, !14}
!llvm.ident = !{!15}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 248211) (llvm/trunk 248217)", isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug, enums: !2, retainedTypes: !3)
!1 = !DIFile(filename: "test.cc", directory: "/ssd/llvm_commit")
!2 = !{}
!3 = !{!4}
!4 = !DIBasicType(name: "double", size: 64, align: 64, encoding: DW_ATE_float)
!6 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 4, type: !7, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
!7 = !DISubroutineType(types: !8)
!8 = !{!9, !9, !10}
!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64, align: 64)
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64, align: 64)
!12 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
!13 = !{i32 2, !"Dwarf Version", i32 4}
!14 = !{i32 2, !"Debug Info Version", i32 3}
!15 = !{!"clang version 3.8.0 (trunk 248211) (llvm/trunk 248217)"}
!16 = !DILocalVariable(name: "argc", arg: 1, scope: !6, file: !1, line: 4, type: !9)
!17 = !DIExpression()
!18 = !DILocation(line: 4, column: 15, scope: !6)
!19 = !DILocalVariable(name: "argv", arg: 2, scope: !6, file: !1, line: 4, type: !10)
!20 = !DILocation(line: 4, column: 27, scope: !6)
!21 = !DILocation(line: 5, column: 8, scope: !22)
!22 = distinct !DILexicalBlock(scope: !6, file: !1, line: 5, column: 8)
!23 = !DILocation(line: 5, column: 13, scope: !22)
!24 = !DILocation(line: 5, column: 8, scope: !6)
!25 = !DILocation(line: 6, column: 6, scope: !22)
!26 = !DILocalVariable(name: "result", scope: !6, file: !1, line: 7, type: !4)
!27 = !DILocation(line: 7, column: 11, scope: !6)
!28 = !DILocalVariable(name: "limit", scope: !6, file: !1, line: 8, type: !9)
!29 = !DILocation(line: 8, column: 8, scope: !6)
!30 = !DILocation(line: 8, column: 21, scope: !6)
!31 = !DILocation(line: 8, column: 16, scope: !6)
!32 = !DILocation(line: 9, column: 8, scope: !33)
!33 = distinct !DILexicalBlock(scope: !6, file: !1, line: 9, column: 8)
!34 = !DILocation(line: 9, column: 14, scope: !33)
!35 = !DILocation(line: 9, column: 8, scope: !6)
!36 = !DILocalVariable(name: "s", scope: !37, file: !1, line: 10, type: !4)
!37 = distinct !DILexicalBlock(scope: !33, file: !1, line: 9, column: 21)
!38 = !DILocation(line: 10, column: 13, scope: !37)
!39 = !DILocation(line: 10, column: 34, scope: !37)
!40 = !DILocation(line: 10, column: 29, scope: !37)
!41 = !DILocation(line: 10, column: 27, scope: !37)
!42 = !DILocalVariable(name: "u", scope: !43, file: !1, line: 11, type: !9)
!43 = distinct !DILexicalBlock(scope: !37, file: !1, line: 11, column: 6)
!44 = !DILocation(line: 11, column: 15, scope: !43)
!45 = !DILocation(line: 11, column: 11, scope: !43)
!46 = !DILocation(line: 11, column: 22, scope: !47)
!47 = distinct !DILexicalBlock(scope: !43, file: !1, line: 11, column: 6)
!48 = !DILocation(line: 11, column: 26, scope: !47)
!49 = !DILocation(line: 11, column: 24, scope: !47)
!50 = !DILocation(line: 11, column: 6, scope: !43)
!51 = !DILocalVariable(name: "x", scope: !52, file: !1, line: 12, type: !4)
!52 = distinct !DILexicalBlock(scope: !47, file: !1, line: 11, column: 38)
!53 = !DILocation(line: 12, column: 15, scope: !52)
!54 = !DILocation(line: 12, column: 19, scope: !52)
!55 = !DILocation(line: 13, column: 12, scope: !52)
!56 = !DILocation(line: 13, column: 14, scope: !52)
!57 = !DILocation(line: 13, column: 32, scope: !52)
!58 = !DILocation(line: 13, column: 22, scope: !52)
!59 = !DILocation(line: 13, column: 10, scope: !52)
!60 = !DILocation(line: 14, column: 13, scope: !52)
!61 = !DILocation(line: 14, column: 24, scope: !52)
!62 = !DILocation(line: 14, column: 22, scope: !52)
!63 = !DILocation(line: 14, column: 26, scope: !52)
!64 = !DILocation(line: 14, column: 15, scope: !52)
!65 = !DILocation(line: 14, column: 10, scope: !52)
!66 = !DILocation(line: 15, column: 6, scope: !52)
!67 = !DILocation(line: 11, column: 34, scope: !47)
!68 = !DILocation(line: 11, column: 6, scope: !47)
!69 = !DILocation(line: 16, column: 15, scope: !37)
!70 = !DILocation(line: 16, column: 13, scope: !37)
!71 = !DILocation(line: 17, column: 4, scope: !37)
!72 = !DILocation(line: 18, column: 20, scope: !73)
!73 = distinct !DILexicalBlock(scope: !33, file: !1, line: 17, column: 11)
!74 = !DILocation(line: 18, column: 15, scope: !73)
!75 = !DILocation(line: 18, column: 13, scope: !73)
!76 = !DILocation(line: 20, column: 30, scope: !6)
!77 = !DILocation(line: 20, column: 4, scope: !6)
!78 = !DILocation(line: 21, column: 4, scope: !6)
!79 = !DILocation(line: 22, column: 2, scope: !6)
!80 = !{!"branch_weights", i32 90, i32 10}
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