; LLVM IR from upupming/algorithm :: AdvancedLevel_C++/1034. Head of a Gang (30) .ll (Z8dfsTravev)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%"class.std::map.0" = type { %"class.std::_Rb_tree.1" }
%"class.std::_Rb_tree.1" = type { %"struct.std::_Rb_tree<int, std::pair<const int, std::__cxx11::basic_string<char>>, std::_Select1st<std::pair<const int, std::__cxx11::basic_string<char>>>, std::less<int>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<int, std::pair<const int, std::__cxx11::basic_string<char>>, std::_Select1st<std::pair<const int, std::__cxx11::basic_string<char>>>, std::less<int>>::_Rb_tree_impl" = type { [8 x i8], %"struct.std::_Rb_tree_header" }
%"struct.std::_Rb_tree_header" = type { %"struct.std::_Rb_tree_node_base", i64 }
%"struct.std::_Rb_tree_node_base" = type { i32, ptr, ptr, ptr }
%"class.std::map" = type { %"class.std::_Rb_tree" }
%"class.std::_Rb_tree" = type { %"struct.std::_Rb_tree<std::__cxx11::basic_string<char>, std::pair<const std::__cxx11::basic_string<char>, int>, std::_Select1st<std::pair<const std::__cxx11::basic_string<char>, int>>, std::less<std::__cxx11::basic_string<char>>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<std::__cxx11::basic_string<char>, std::pair<const std::__cxx11::basic_string<char>, int>, std::_Select1st<std::pair<const std::__cxx11::basic_string<char>, int>>, std::less<std::__cxx11::basic_string<char>>>::_Rb_tree_impl" = type { [8 x i8], %"struct.std::_Rb_tree_header" }

@_Z11intToStringB5cxx11 = external dso_local global %"class.std::map.0", align 8
@_Z3ansB5cxx11 = external dso_local global %"class.std::map", align 8
@idNumber = external dso_local global i32, align 4
@k = external dso_local global i32, align 4
@vis = external dso_local global [2010 x i8], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt3mapINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEiSt4lessIS5_ESaISt4pairIKS5_iEEEixERS9_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 8 dereferenceable(32)) #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt3mapIiNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESt4lessIiESaISt4pairIKiS5_EEEixERS9_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(4)) #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsiRiS_S_(i32 noundef, ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z8dfsTravev() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 1, ptr %1, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %33, %0
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = load i32, ptr @idNumber, align 4, !tbaa !5
  %8 = icmp slt i32 %6, %7
  br i1 %8, label %10, label %9

9:                                                ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  br label %36

10:                                               ; preds = %5
  %11 = load i32, ptr %1, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [2010 x i8], ptr @vis, i64 0, i64 %12
  %14 = load i8, ptr %13, align 1, !tbaa !9, !range !11, !noundef !12
  %15 = trunc i8 %14 to i1
  %16 = zext i1 %15 to i32
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %32

18:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #2
  %19 = load i32, ptr %1, align 4, !tbaa !5
  store i32 %19, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  %20 = load i32, ptr %1, align 4, !tbaa !5
  call void @_Z3dfsiRiS_S_(i32 noundef %20, ptr noundef nonnull align 4 dereferenceable(4) %2, ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = icmp sgt i32 %21, 2
  br i1 %22, label %23, label %31

23:                                               ; preds = %18
  %24 = load i32, ptr %4, align 4, !tbaa !5
  %25 = load i32, ptr @k, align 4, !tbaa !5
  %26 = icmp sgt i32 %24, %25
  br i1 %26, label %27, label %31

27:                                               ; preds = %23
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt3mapIiNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESt4lessIiESaISt4pairIKiS5_EEEixERS9_(ptr noundef nonnull align 8 dereferenceable(48) @_Z11intToStringB5cxx11, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %30 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt3mapINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEiSt4lessIS5_ESaISt4pairIKS5_iEEEixERS9_(ptr noundef nonnull align 8 dereferenceable(48) @_Z3ansB5cxx11, ptr noundef nonnull align 8 dereferenceable(32) %29)
  store i32 %28, ptr %30, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %27, %23, %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #2
  br label %32

32:                                               ; preds = %31, %10
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %1, align 4, !tbaa !5
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %1, align 4, !tbaa !5
  br label %5, !llvm.loop !13

36:                                               ; preds = %9
  ret void
}

attributes #0 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%"class.std::map.0" = type { %"class.std::_Rb_tree.1" }
%"class.std::_Rb_tree.1" = type { %"struct.std::_Rb_tree<int, std::pair<const int, std::__cxx11::basic_string<char>>, std::_Select1st<std::pair<const int, std::__cxx11::basic_string<char>>>, std::less<int>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<int, std::pair<const int, std::__cxx11::basic_string<char>>, std::_Select1st<std::pair<const int, std::__cxx11::basic_string<char>>>, std::less<int>>::_Rb_tree_impl" = type { [8 x i8], %"struct.std::_Rb_tree_header" }
%"struct.std::_Rb_tree_header" = type { %"struct.std::_Rb_tree_node_base", i64 }
%"struct.std::_Rb_tree_node_base" = type { i32, ptr, ptr, ptr }
%"class.std::map" = type { %"class.std::_Rb_tree" }
%"class.std::_Rb_tree" = type { %"struct.std::_Rb_tree<std::__cxx11::basic_string<char>, std::pair<const std::__cxx11::basic_string<char>, int>, std::_Select1st<std::pair<const std::__cxx11::basic_string<char>, int>>, std::less<std::__cxx11::basic_string<char>>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<std::__cxx11::basic_string<char>, std::pair<const std::__cxx11::basic_string<char>, int>, std::_Select1st<std::pair<const std::__cxx11::basic_string<char>, int>>, std::less<std::__cxx11::basic_string<char>>>::_Rb_tree_impl" = type { [8 x i8], %"struct.std::_Rb_tree_header" }

@_Z11intToStringB5cxx11 = external dso_local global %"class.std::map.0", align 8
@_Z3ansB5cxx11 = external dso_local global %"class.std::map", align 8
@idNumber = external dso_local local_unnamed_addr global i32, align 4
@k = external dso_local local_unnamed_addr global i32, align 4
@vis = external dso_local local_unnamed_addr global [2010 x i8], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt3mapINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEiSt4lessIS5_ESaISt4pairIKS5_iEEEixERS9_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt3mapIiNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESt4lessIiESaISt4pairIKiS5_EEEixERS9_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsiRiS_S_(i32 noundef, ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z8dfsTravev() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = load i32, ptr @idNumber, align 4, !tbaa !5
  %5 = icmp sgt i32 %4, 1
  br i1 %5, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %22, %0
  ret void

.lr.ph:                                           ; preds = %0, %22
  %6 = phi i32 [ %23, %22 ], [ %4, %0 ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %22 ], [ 1, %0 ]
  %7 = getelementptr inbounds [2010 x i8], ptr @vis, i64 0, i64 %indvars.iv
  %8 = load i8, ptr %7, align 1, !tbaa !9, !range !11, !noundef !12
  %9 = icmp eq i8 %8, 0
  br i1 %9, label %10, label %22

10:                                               ; preds = %.lr.ph
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #2
  %11 = trunc nuw nsw i64 %indvars.iv to i32
  store i32 %11, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #2
  store i32 0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #2
  store i32 0, ptr %3, align 4, !tbaa !5
  call void @_Z3dfsiRiS_S_(i32 noundef %11, ptr noundef nonnull align 4 dereferenceable(4) %1, ptr noundef nonnull align 4 dereferenceable(4) %2, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = icmp sgt i32 %12, 2
  br i1 %13, label %14, label %21

14:                                               ; preds = %10
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = load i32, ptr @k, align 4, !tbaa !5
  %17 = icmp sgt i32 %15, %16
  br i1 %17, label %18, label %21

18:                                               ; preds = %14
  %19 = call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt3mapIiNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESt4lessIiESaISt4pairIKiS5_EEEixERS9_(ptr noundef nonnull align 8 dereferenceable(48) @_Z11intToStringB5cxx11, ptr noundef nonnull align 4 dereferenceable(4) %1)
  %20 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt3mapINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEiSt4lessIS5_ESaISt4pairIKS5_iEEEixERS9_(ptr noundef nonnull align 8 dereferenceable(48) @_Z3ansB5cxx11, ptr noundef nonnull align 8 dereferenceable(32) %19)
  store i32 %12, ptr %20, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %18, %14, %10
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #2
  %.pre = load i32, ptr @idNumber, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %.lr.ph, %21
  %23 = phi i32 [ %6, %.lr.ph ], [ %.pre, %21 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %24 = sext i32 %23 to i64
  %25 = icmp slt i64 %indvars.iv.next, %24
  br i1 %25, label %.lr.ph, label %._crit_edge, !llvm.loop !13
}

attributes #0 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass