llvm/test/Transforms/SampleProfile/branch.ll

; RUN: opt < %s -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;
;     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 = 0;
;   }
;   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: nounwind uwtable
define i32 @main(i32 %argc, i8** nocapture readonly %argv) #0 {
; CHECK: Printing analysis 'Branch Probability Analysis' for function 'main':

entry:
  tail call void @llvm.dbg.value(metadata !{i32 %argc}, i64 0, metadata !13, metadata !{}), !dbg !27
  tail call void @llvm.dbg.value(metadata !{i8** %argv}, i64 0, metadata !14, metadata !{}), !dbg !27
  %cmp = icmp slt i32 %argc, 2, !dbg !28
  br i1 %cmp, label %return, label %if.end, !dbg !28
; CHECK: edge entry -> return probability is 1 / 2 = 50%
; CHECK: edge entry -> if.end probability is 1 / 2 = 50%

if.end:                                           ; preds = %entry
  %arrayidx = getelementptr inbounds i8** %argv, i64 1, !dbg !30
  %0 = load i8** %arrayidx, align 8, !dbg !30, !tbaa !31
  %call = tail call i32 @atoi(i8* %0) #4, !dbg !30
  tail call void @llvm.dbg.value(metadata !{i32 %call}, i64 0, metadata !17, metadata !{}), !dbg !30
  %cmp1 = icmp sgt i32 %call, 100, !dbg !35
  br i1 %cmp1, label %for.body, label %if.end6, !dbg !35
; CHECK: edge if.end -> for.body probability is 1 / 2 = 50%
; CHECK: edge if.end -> if.end6 probability is 1 / 2 = 50%

for.body:                                         ; preds = %if.end, %for.body
  %u.016 = phi i32 [ %inc, %for.body ], [ 0, %if.end ]
  %s.015 = phi double [ %sub, %for.body ], [ 0x40370ABE6A337A81, %if.end ]
  %add = fadd double %s.015, 3.049000e+00, !dbg !36
  %conv = sitofp i32 %u.016 to double, !dbg !36
  %add4 = fadd double %add, %conv, !dbg !36
  tail call void @llvm.dbg.value(metadata !{double %add4}, i64 0, metadata !18, metadata !{}), !dbg !36
  %div = fdiv double 3.940000e+00, %s.015, !dbg !37
  %mul = fmul double %div, 3.200000e-01, !dbg !37
  %add5 = fadd double %add4, %mul, !dbg !37
  %sub = fsub double %add4, %add5, !dbg !37
  tail call void @llvm.dbg.value(metadata !{double %sub}, i64 0, metadata !18, metadata !{}), !dbg !37
  %inc = add nsw i32 %u.016, 1, !dbg !38
  tail call void @llvm.dbg.value(metadata !{i32 %inc}, i64 0, metadata !21, metadata !{}), !dbg !38
  %exitcond = icmp eq i32 %inc, %call, !dbg !38
  br i1 %exitcond, label %if.end6, label %for.body, !dbg !38
; CHECK: edge for.body -> if.end6 probability is 1 / 10227 = 0.00977804
; CHECK: edge for.body -> for.body probability is 10226 / 10227 = 99.9902% [HOT edge]

if.end6:                                          ; preds = %for.body, %if.end
  %result.0 = phi double [ 0.000000e+00, %if.end ], [ %sub, %for.body ]
  %call7 = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([15 x i8]* @.str, i64 0, i64 0), double %result.0), !dbg !39
  br label %return, !dbg !40
; CHECK: edge if.end6 -> return probability is 16 / 16 = 100% [HOT edge]

return:                                           ; preds = %entry, %if.end6
  %retval.0 = phi i32 [ 0, %if.end6 ], [ 1, %entry ]
  ret i32 %retval.0, !dbg !41
}

; Function Attrs: nounwind readonly
declare i32 @atoi(i8* nocapture) #1

; Function Attrs: nounwind
declare i32 @printf(i8* nocapture readonly, ...) #2

; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3

attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readonly "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #3 = { nounwind readnone }
attributes #4 = { nounwind readonly }

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!25, !42}
!llvm.ident = !{!26}

!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.4 (trunk 192896) (llvm/trunk 192895)", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [./branch.cc] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"branch.cc", metadata !"."}
!2 = metadata !{i32 0}
!3 = metadata !{metadata !4}
!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"main", metadata !"main", metadata !"", i32 4, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, i32 (i32, i8**)* @main, null, null, metadata !12, i32 4} ; [ DW_TAG_subprogram ] [line 4] [def] [main]
!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [./branch.cc]
!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!7 = metadata !{metadata !8, metadata !8, metadata !9}
!8 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!9 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !10} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
!10 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !11} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from char]
!11 = metadata !{i32 786468, null, null, metadata !"char", i32 0, i64 8, i64 8, i64 0, i32 0, i32 6} ; [ DW_TAG_base_type ] [char] [line 0, size 8, align 8, offset 0, enc DW_ATE_signed_char]
!12 = metadata !{metadata !13, metadata !14, metadata !15, metadata !17, metadata !18, metadata !21, metadata !23}
!13 = metadata !{i32 786689, metadata !4, metadata !"argc", metadata !5, i32 16777220, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [argc] [line 4]
!14 = metadata !{i32 786689, metadata !4, metadata !"argv", metadata !5, i32 33554436, metadata !9, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [argv] [line 4]
!15 = metadata !{i32 786688, metadata !4, metadata !"result", metadata !5, i32 7, metadata !16, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [result] [line 7]
!16 = metadata !{i32 786468, null, null, metadata !"double", i32 0, i64 64, i64 64, i64 0, i32 0, i32 4} ; [ DW_TAG_base_type ] [double] [line 0, size 64, align 64, offset 0, enc DW_ATE_float]
!17 = metadata !{i32 786688, metadata !4, metadata !"limit", metadata !5, i32 8, metadata !8, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [limit] [line 8]
!18 = metadata !{i32 786688, metadata !19, metadata !"s", metadata !5, i32 10, metadata !16, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [s] [line 10]
!19 = metadata !{i32 786443, metadata !1, metadata !20, i32 9, i32 0, i32 0, i32 2} ; [ DW_TAG_lexical_block ] [./branch.cc]
!20 = metadata !{i32 786443, metadata !1, metadata !4, i32 9, i32 0, i32 0, i32 1} ; [ DW_TAG_lexical_block ] [./branch.cc]
!21 = metadata !{i32 786688, metadata !22, metadata !"u", metadata !5, i32 11, metadata !8, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [u] [line 11]
!22 = metadata !{i32 786443, metadata !1, metadata !19, i32 11, i32 0, i32 0, i32 3} ; [ DW_TAG_lexical_block ] [./branch.cc]
!23 = metadata !{i32 786688, metadata !24, metadata !"x", metadata !5, i32 12, metadata !16, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [x] [line 12]
!24 = metadata !{i32 786443, metadata !1, metadata !22, i32 11, i32 0, i32 0, i32 4} ; [ DW_TAG_lexical_block ] [./branch.cc]
!25 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!26 = metadata !{metadata !"clang version 3.4 (trunk 192896) (llvm/trunk 192895)"}
!27 = metadata !{i32 4, i32 0, metadata !4, null}
!28 = metadata !{i32 5, i32 0, metadata !29, null}
!29 = metadata !{i32 786443, metadata !1, metadata !4, i32 5, i32 0, i32 0, i32 0} ; [ DW_TAG_lexical_block ] [./branch.cc]
!30 = metadata !{i32 8, i32 0, metadata !4, null} ; [ DW_TAG_imported_declaration ]
!31 = metadata !{metadata !32, metadata !32, i64 0}
!32 = metadata !{metadata !"any pointer", metadata !33, i64 0}
!33 = metadata !{metadata !"omnipotent char", metadata !34, i64 0}
!34 = metadata !{metadata !"Simple C/C++ TBAA"}
!35 = metadata !{i32 9, i32 0, metadata !20, null}
!36 = metadata !{i32 13, i32 0, metadata !24, null}
!37 = metadata !{i32 14, i32 0, metadata !24, null}
!38 = metadata !{i32 11, i32 0, metadata !22, null}
!39 = metadata !{i32 20, i32 0, metadata !4, null}
!40 = metadata !{i32 21, i32 0, metadata !4, null}
!41 = metadata !{i32 22, i32 0, metadata !4, null}
!42 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}