; LLVM IR from TheAlgorithms/C-Plus-Plus :: graph (connected_components_with_dsu)

; 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<long, long, std::_Identity<long>, std::less<long>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<long, long, std::_Identity<long>, std::less<long>>::_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 }

@_ZN5graph14disjoint_union15number_of_nodesE = external dso_local global i32, align 4

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZN5graph14disjoint_union8find_setEl(i64 noundef) #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_ZN5graph14disjoint_union26no_of_connected_componentsEv() #2 personality ptr @__gxx_personality_v0 {
  %1 = alloca %"class.std::set", align 8
  %2 = alloca i32, align 4
  %3 = alloca i64, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca %"struct.std::pair", align 8
  call void @llvm.lifetime.start.p0(i64 48, ptr %1) #3
  call void @_ZNSt3setIlSt4lessIlESaIlEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48) %1) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 1, ptr %2, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %22, %0
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = load i32, ptr @_ZN5graph14disjoint_union15number_of_nodesE, align 4, !tbaa !5
  %10 = icmp ule i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  br label %29

12:                                               ; preds = %7
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = zext i32 %13 to i64
  %15 = call noundef i64 @_ZN5graph14disjoint_union8find_setEl(i64 noundef %14)
  store i64 %15, ptr %3, align 8, !tbaa !9
  %16 = invoke { ptr, i8 } @_ZNSt3setIlSt4lessIlESaIlEE6insertEOl(ptr noundef nonnull align 8 dereferenceable(48) %1, ptr noundef nonnull align 8 dereferenceable(8) %3)
          to label %17 unwind label %25

17:                                               ; preds = %12
  %18 = getelementptr inbounds { ptr, i8 }, ptr %6, i32 0, i32 0
  %19 = extractvalue { ptr, i8 } %16, 0
  store ptr %19, ptr %18, align 8
  %20 = getelementptr inbounds { ptr, i8 }, ptr %6, i32 0, i32 1
  %21 = extractvalue { ptr, i8 } %16, 1
  store i8 %21, ptr %20, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  br label %22

22:                                               ; preds = %17
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = add i32 %23, 1
  store i32 %24, ptr %2, align 4, !tbaa !5
  br label %7, !llvm.loop !11

25:                                               ; preds = %12
  %26 = landingpad { ptr, i32 }
          cleanup
  %27 = extractvalue { ptr, i32 } %26, 0
  store ptr %27, ptr %4, align 8
  %28 = extractvalue { ptr, i32 } %26, 1
  store i32 %28, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  call void @_ZNSt3setIlSt4lessIlESaIlEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %1) #3
  call void @llvm.lifetime.end.p0(i64 48, ptr %1) #3
  br label %32

29:                                               ; preds = %11
  %30 = call noundef i64 @_ZNKSt3setIlSt4lessIlESaIlEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(48) %1) #3
  %31 = trunc i64 %30 to i32
  call void @_ZNSt3setIlSt4lessIlESaIlEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %1) #3
  call void @llvm.lifetime.end.p0(i64 48, ptr %1) #3
  ret i32 %31

32:                                               ; preds = %25
  %33 = load ptr, ptr %4, align 8
  %34 = load i32, ptr %5, align 4
  %35 = insertvalue { ptr, i32 } poison, ptr %33, 0
  %36 = insertvalue { ptr, i32 } %35, i32 %34, 1
  resume { ptr, i32 } %36
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3setIlSt4lessIlESaIlEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt3setIlSt4lessIlESaIlEE6insertEOl(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt3setIlSt4lessIlESaIlEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(48)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3setIlSt4lessIlESaIlEED2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #1 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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<long, long, std::_Identity<long>, std::less<long>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<long, long, std::_Identity<long>, std::less<long>>::_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 }

@_ZN5graph14disjoint_union15number_of_nodesE = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZN5graph14disjoint_union8find_setEl(i64 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_ZN5graph14disjoint_union26no_of_connected_componentsEv() local_unnamed_addr #2 personality ptr @__gxx_personality_v0 {
  %1 = alloca %"class.std::set", align 8
  %2 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 48, ptr nonnull %1) #3
  call void @_ZNSt3setIlSt4lessIlESaIlEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48) %1) #3
  %3 = load i32, ptr @_ZN5graph14disjoint_union15number_of_nodesE, align 4, !tbaa !5
  %.not4 = icmp eq i32 %3, 0
  br i1 %.not4, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %9, %0
  %4 = call noundef i64 @_ZNKSt3setIlSt4lessIlESaIlEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(48) %1) #3
  %5 = trunc i64 %4 to i32
  call void @_ZNSt3setIlSt4lessIlESaIlEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %1) #3
  call void @llvm.lifetime.end.p0(i64 48, ptr nonnull %1) #3
  ret i32 %5

.lr.ph:                                           ; preds = %0, %9
  %.05 = phi i32 [ %10, %9 ], [ 1, %0 ]
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  %6 = zext i32 %.05 to i64
  %7 = call noundef i64 @_ZN5graph14disjoint_union8find_setEl(i64 noundef %6)
  store i64 %7, ptr %2, align 8, !tbaa !9
  %8 = invoke { ptr, i8 } @_ZNSt3setIlSt4lessIlESaIlEE6insertEOl(ptr noundef nonnull align 8 dereferenceable(48) %1, ptr noundef nonnull align 8 dereferenceable(8) %2)
          to label %9 unwind label %12

9:                                                ; preds = %.lr.ph
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  %10 = add i32 %.05, 1
  %11 = load i32, ptr @_ZN5graph14disjoint_union15number_of_nodesE, align 4, !tbaa !5
  %.not = icmp ugt i32 %10, %11
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

12:                                               ; preds = %.lr.ph
  %13 = landingpad { ptr, i32 }
          cleanup
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  call void @_ZNSt3setIlSt4lessIlESaIlEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %1) #3
  call void @llvm.lifetime.end.p0(i64 48, ptr nonnull %1) #3
  resume { ptr, i32 } %13
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3setIlSt4lessIlESaIlEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt3setIlSt4lessIlESaIlEE6insertEOl(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt3setIlSt4lessIlESaIlEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(48)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3setIlSt4lessIlESaIlEED2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #1 align 2

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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