; LLVM IR from Lakhankumawat/LearnCPP :: S-Sets (FindKthDistinctCharacterGivenString)

; 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::set" = type { %"class.std::_Rb_tree" }
%"class.std::_Rb_tree" = type { %"struct.std::_Rb_tree<int, int, std::_Identity<int>, std::less<int>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<int, int, std::_Identity<int>, 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 }
%"struct.std::pair" = type <{ %"struct.std::_Rb_tree_const_iterator", i8, [7 x i8] }>
%"struct.std::_Rb_tree_const_iterator" = type { ptr }

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z16printKthDistinctRNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEERi(ptr noundef nonnull align 8 dereferenceable(32) %0, ptr noundef nonnull align 4 dereferenceable(4) %1) #0 personality ptr @__gxx_personality_v0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca %"class.std::set", align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca ptr, align 8
  %12 = alloca i32, align 4
  %13 = alloca %"struct.std::pair", align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 48, ptr %6) #3
  call void @_ZNSt3setIiSt4lessIiESaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48) %6) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %14) #3
  %16 = trunc i64 %15 to i32
  store i32 %16, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %58, %2
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = load i32, ptr %7, align 4, !tbaa !9
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  store i32 2, ptr %9, align 4
  br label %61

22:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load i32, ptr %8, align 4, !tbaa !9
  %25 = sext i32 %24 to i64
  %26 = invoke noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %23, i64 noundef %25)
          to label %27 unwind label %49

27:                                               ; preds = %22
  %28 = load i8, ptr %26, align 1, !tbaa !11
  %29 = sext i8 %28 to i32
  store i32 %29, ptr %10, align 4, !tbaa !9
  %30 = invoke { ptr, i8 } @_ZNSt3setIiSt4lessIiESaIiEE6insertEOi(ptr noundef nonnull align 8 dereferenceable(48) %6, ptr noundef nonnull align 4 dereferenceable(4) %10)
          to label %31 unwind label %49

31:                                               ; preds = %27
  %32 = getelementptr inbounds { ptr, i8 }, ptr %13, i32 0, i32 0
  %33 = extractvalue { ptr, i8 } %30, 0
  store ptr %33, ptr %32, align 8
  %34 = getelementptr inbounds { ptr, i8 }, ptr %13, i32 0, i32 1
  %35 = extractvalue { ptr, i8 } %30, 1
  store i8 %35, ptr %34, align 8
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  %36 = call noundef i64 @_ZNKSt3setIiSt4lessIiESaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(48) %6) #3
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = load i32, ptr %37, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = icmp eq i64 %36, %39
  br i1 %40, label %41, label %57

41:                                               ; preds = %31
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = load i32, ptr %8, align 4, !tbaa !9
  %44 = sext i32 %43 to i64
  %45 = invoke noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %42, i64 noundef %44)
          to label %46 unwind label %53

46:                                               ; preds = %41
  %47 = load i8, ptr %45, align 1, !tbaa !11
  %48 = sext i8 %47 to i32
  store i32 %48, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %61

49:                                               ; preds = %27, %22
  %50 = landingpad { ptr, i32 }
          cleanup
  %51 = extractvalue { ptr, i32 } %50, 0
  store ptr %51, ptr %11, align 8
  %52 = extractvalue { ptr, i32 } %50, 1
  store i32 %52, ptr %12, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %63

53:                                               ; preds = %41
  %54 = landingpad { ptr, i32 }
          cleanup
  %55 = extractvalue { ptr, i32 } %54, 0
  store ptr %55, ptr %11, align 8
  %56 = extractvalue { ptr, i32 } %54, 1
  store i32 %56, ptr %12, align 4
  br label %63

57:                                               ; preds = %31
  br label %58

58:                                               ; preds = %57
  %59 = load i32, ptr %8, align 4, !tbaa !9
  %60 = add nsw i32 %59, 1
  store i32 %60, ptr %8, align 4, !tbaa !9
  br label %17, !llvm.loop !12

61:                                               ; preds = %46, %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  %62 = load i32, ptr %9, align 4
  switch i32 %62, label %65 [
    i32 2, label %64
  ]

63:                                               ; preds = %53, %49
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @_ZNSt3setIiSt4lessIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %6) #3
  call void @llvm.lifetime.end.p0(i64 48, ptr %6) #3
  br label %67

64:                                               ; preds = %61
  store i32 -1, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %65

65:                                               ; preds = %64, %61
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @_ZNSt3setIiSt4lessIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %6) #3
  call void @llvm.lifetime.end.p0(i64 48, ptr %6) #3
  %66 = load i32, ptr %3, align 4
  ret i32 %66

67:                                               ; preds = %63
  %68 = load ptr, ptr %11, align 8
  %69 = load i32, ptr %12, align 4
  %70 = insertvalue { ptr, i32 } poison, ptr %68, 0
  %71 = insertvalue { ptr, i32 } %70, i32 %69, 1
  resume { ptr, i32 } %71
}

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3setIiSt4lessIiESaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32)) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt3setIiSt4lessIiESaIiEE6insertEOi(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(4)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) #2 align 2

declare i32 @__gxx_personality_v0(...)

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt3setIiSt4lessIiESaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(48)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3setIiSt4lessIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #2 align 2

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 = { mustprogress nounwind 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 #3 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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::set" = type { %"class.std::_Rb_tree" }
%"class.std::_Rb_tree" = type { %"struct.std::_Rb_tree<int, int, std::_Identity<int>, std::less<int>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<int, int, std::_Identity<int>, 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 }

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z16printKthDistinctRNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEERi(ptr noundef nonnull align 8 dereferenceable(32) %0, ptr nocapture noundef nonnull readonly align 4 dereferenceable(4) %1) local_unnamed_addr #0 personality ptr @__gxx_personality_v0 {
  %3 = alloca %"class.std::set", align 8
  %4 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 48, ptr nonnull %3) #3
  call void @_ZNSt3setIiSt4lessIiESaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48) %3) #3
  %5 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #3
  %6 = trunc i64 %5 to i32
  %.not15 = icmp sgt i32 %6, 0
  br i1 %.not15, label %.lr.ph.preheader, label %.loopexit

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = and i64 %5, 2147483647
  br label %.lr.ph

7:                                                ; preds = %12
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %.loopexit, label %.lr.ph, !llvm.loop !5

.lr.ph:                                           ; preds = %.lr.ph.preheader, %7
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %7 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #3
  %8 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %indvars.iv)
  %9 = load i8, ptr %8, align 1, !tbaa !7
  %10 = sext i8 %9 to i32
  store i32 %10, ptr %4, align 4, !tbaa !10
  %11 = invoke { ptr, i8 } @_ZNSt3setIiSt4lessIiESaIiEE6insertEOi(ptr noundef nonnull align 8 dereferenceable(48) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
          to label %12 unwind label %21

12:                                               ; preds = %.lr.ph
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #3
  %13 = call noundef i64 @_ZNKSt3setIiSt4lessIiESaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(48) %3) #3
  %14 = load i32, ptr %1, align 4, !tbaa !10
  %15 = sext i32 %14 to i64
  %16 = icmp eq i64 %13, %15
  br i1 %16, label %17, label %7

17:                                               ; preds = %12
  %18 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %indvars.iv)
  %19 = load i8, ptr %18, align 1, !tbaa !7
  %20 = sext i8 %19 to i32
  br label %.loopexit

21:                                               ; preds = %.lr.ph
  %22 = landingpad { ptr, i32 }
          cleanup
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #3
  call void @_ZNSt3setIiSt4lessIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %3) #3
  call void @llvm.lifetime.end.p0(i64 48, ptr nonnull %3) #3
  resume { ptr, i32 } %22

.loopexit:                                        ; preds = %7, %2, %17
  %spec.select = phi i32 [ %20, %17 ], [ -1, %2 ], [ -1, %7 ]
  call void @_ZNSt3setIiSt4lessIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %3) #3
  call void @llvm.lifetime.end.p0(i64 48, ptr nonnull %3) #3
  ret i32 %spec.select
}

; 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 nounwind uwtable
declare dso_local void @_ZNSt3setIiSt4lessIiESaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt3setIiSt4lessIiESaIiEE6insertEOi(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) local_unnamed_addr #2 align 2

declare i32 @__gxx_personality_v0(...)

; 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 nounwind uwtable
declare dso_local noundef i64 @_ZNKSt3setIiSt4lessIiESaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(48)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3setIiSt4lessIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #2 align 2

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 = { mustprogress nounwind 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 #3 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !8, i64 0}


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