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llvm-mirror/test/Transforms/SampleProfile/fnptr.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

158 lines
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; The two profiles used in this test are the same but encoded in different
; formats. This checks that we produce the same profile annotations regardless
; of the profile format.
;
; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/fnptr.prof | opt -analyze -branch-prob | FileCheck %s
; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/fnptr.binprof | opt -analyze -branch-prob | FileCheck %s
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/fnptr.prof | opt -analyze -branch-prob | FileCheck %s
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/fnptr.binprof | opt -analyze -branch-prob | FileCheck %s
; CHECK: edge for.body3 -> if.then probability is 0x1a56a56a / 0x80000000 = 20.58%
; CHECK: edge for.body3 -> if.else probability is 0x65a95a96 / 0x80000000 = 79.42%
; CHECK: edge for.inc -> for.inc12 probability is 0x000fbd1c / 0x80000000 = 0.05%
; CHECK: edge for.inc -> for.body3 probability is 0x7ff042e4 / 0x80000000 = 99.95%
; CHECK: edge for.inc12 -> for.end14 probability is 0x04000000 / 0x80000000 = 3.12%
; CHECK: edge for.inc12 -> for.cond1.preheader probability is 0x7c000000 / 0x80000000 = 96.88%
; Original C++ test case.
;
; #include <stdlib.h>
; #include <math.h>
; #include <stdio.h>
;
; #define N 10000
; #define M 6000
;
; double foo(int x) {
; return x * sin((double)x);
; }
;
; double bar(int x) {
; return x - cos((double)x);
; }
;
; int main() {
; double (*fptr)(int);
; double S = 0;
; for (int i = 0; i < N; i++)
; for (int j = 0; j < M; j++) {
; fptr = (rand() % 100 < 30) ? foo : bar;
; if (rand() % 100 < 10)
; S += (*fptr)(i + j * 300);
; else
; S += (*fptr)(i - j / 840);
; }
; printf("S = %lf\n", S);
; return 0;
; }
@.str = private unnamed_addr constant [9 x i8] c"S = %lf\0A\00", align 1
define double @_Z3fooi(i32 %x) #0 !dbg !3 {
entry:
%conv = sitofp i32 %x to double, !dbg !2
%call = tail call double @sin(double %conv) #3, !dbg !8
%mul = fmul double %conv, %call, !dbg !8
ret double %mul, !dbg !8
}
declare double @sin(double) #1
define double @_Z3bari(i32 %x) #0 !dbg !10 {
entry:
%conv = sitofp i32 %x to double, !dbg !9
%call = tail call double @cos(double %conv) #3, !dbg !11
%sub = fsub double %conv, %call, !dbg !11
ret double %sub, !dbg !11
}
declare double @cos(double) #1
define i32 @main() #2 !dbg !13 {
entry:
br label %for.cond1.preheader, !dbg !12
for.cond1.preheader: ; preds = %for.inc12, %entry
%i.025 = phi i32 [ 0, %entry ], [ %inc13, %for.inc12 ]
%S.024 = phi double [ 0.000000e+00, %entry ], [ %S.2.lcssa, %for.inc12 ]
br label %for.body3, !dbg !14
for.body3: ; preds = %for.inc, %for.cond1.preheader
%j.023 = phi i32 [ 0, %for.cond1.preheader ], [ %inc, %for.inc ]
%S.122 = phi double [ %S.024, %for.cond1.preheader ], [ %S.2, %for.inc ]
%call = tail call i32 @rand() #3, !dbg !15
%rem = srem i32 %call, 100, !dbg !15
%cmp4 = icmp slt i32 %rem, 30, !dbg !15
%_Z3fooi._Z3bari = select i1 %cmp4, double (i32)* @_Z3fooi, double (i32)* @_Z3bari, !dbg !15
%call5 = tail call i32 @rand() #3, !dbg !16
%rem6 = srem i32 %call5, 100, !dbg !16
%cmp7 = icmp slt i32 %rem6, 10, !dbg !16
br i1 %cmp7, label %if.then, label %if.else, !dbg !16
if.then: ; preds = %for.body3
%mul = mul nsw i32 %j.023, 300, !dbg !18
%add = add nsw i32 %mul, %i.025, !dbg !18
%call8 = tail call double %_Z3fooi._Z3bari(i32 %add), !dbg !18
br label %for.inc, !dbg !18
if.else: ; preds = %for.body3
%div = sdiv i32 %j.023, 840, !dbg !19
%sub = sub nsw i32 %i.025, %div, !dbg !19
%call10 = tail call double %_Z3fooi._Z3bari(i32 %sub), !dbg !19
br label %for.inc
for.inc: ; preds = %if.then, %if.else
%call8.pn = phi double [ %call8, %if.then ], [ %call10, %if.else ]
%S.2 = fadd double %S.122, %call8.pn, !dbg !18
%inc = add nsw i32 %j.023, 1, !dbg !20
%exitcond = icmp eq i32 %j.023, 5999, !dbg !14
br i1 %exitcond, label %for.inc12, label %for.body3, !dbg !14
for.inc12: ; preds = %for.inc
%S.2.lcssa = phi double [ %S.2, %for.inc ]
%inc13 = add nsw i32 %i.025, 1, !dbg !22
%exitcond26 = icmp eq i32 %i.025, 9999, !dbg !12
br i1 %exitcond26, label %for.end14, label %for.cond1.preheader, !dbg !12
for.end14: ; preds = %for.inc12
%S.2.lcssa.lcssa = phi double [ %S.2.lcssa, %for.inc12 ]
%call15 = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), double %S.2.lcssa.lcssa), !dbg !24
ret i32 0, !dbg !25
}
; Function Attrs: nounwind
declare i32 @rand() #1
; Function Attrs: nounwind
declare i32 @printf(i8* nocapture readonly, ...) #1
!llvm.module.flags = !{!0}
!llvm.ident = !{!1}
!llvm.dbg.cu = !{!26}
!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = !{!"clang version 3.6.0 "}
!2 = !DILocation(line: 9, column: 3, scope: !3)
!3 = distinct !DISubprogram(name: "foo", line: 8, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !26, scopeLine: 8, file: !4, scope: !5, type: !6, retainedNodes: !7)
!4 = !DIFile(filename: "fnptr.cc", directory: ".")
!5 = !DIFile(filename: "fnptr.cc", directory: ".")
!6 = !DISubroutineType(types: !7)
!7 = !{}
!8 = !DILocation(line: 9, column: 14, scope: !3)
!9 = !DILocation(line: 13, column: 3, scope: !10)
!10 = distinct !DISubprogram(name: "bar", line: 12, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !26, scopeLine: 12, file: !4, scope: !5, type: !6, retainedNodes: !7)
!11 = !DILocation(line: 13, column: 14, scope: !10)
!12 = !DILocation(line: 19, column: 3, scope: !13)
!13 = distinct !DISubprogram(name: "main", line: 16, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !26, scopeLine: 16, file: !4, scope: !5, type: !6, retainedNodes: !7)
!14 = !DILocation(line: 20, column: 5, scope: !13)
!15 = !DILocation(line: 21, column: 15, scope: !13)
!16 = !DILocation(line: 22, column: 11, scope: !13)
!18 = !DILocation(line: 23, column: 14, scope: !13)
!19 = !DILocation(line: 25, column: 14, scope: !13)
!20 = !DILocation(line: 20, column: 28, scope: !13)
!22 = !DILocation(line: 19, column: 26, scope: !13)
!24 = !DILocation(line: 27, column: 3, scope: !13)
!25 = !DILocation(line: 28, column: 3, scope: !13)
!26 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: FullDebug, file: !4)
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