; LLVM IR from tangjz/acm-icpc :: codeforces/gym/101174K.ll (Z9dsu_mergeii)

; 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<std::pair<int, int>, std::pair<int, int>, std::_Identity<std::pair<int, int>>, std::less<std::pair<int, int>>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<std::pair<int, int>, std::pair<int, int>, std::_Identity<std::pair<int, int>>, std::less<std::pair<int, 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 { i32, i32 }
%"struct.std::pair.2" = type <{ %"struct.std::_Rb_tree_const_iterator", i8, [7 x i8] }>
%"struct.std::_Rb_tree_const_iterator" = type { ptr }

@dsu = external dso_local global [100001 x i32], align 16
@multi = external dso_local global %"class.std::set", align 8

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z8dsu_findi(i32 noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z9dsu_mergeii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i1, align 1
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca %"struct.std::pair", align 4
  %7 = alloca %"struct.std::pair", align 4
  %8 = alloca %"struct.std::pair.2", align 8
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = icmp eq i32 %9, %10
  br i1 %11, label %12, label %13

12:                                               ; preds = %2
  store i1 true, ptr %3, align 1
  br label %70

13:                                               ; preds = %2
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = icmp sgt i32 %14, %15
  br i1 %16, label %17, label %18

17:                                               ; preds = %13
  call void @_ZSt4swapIiENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %5) #3
  br label %18

18:                                               ; preds = %17, %13
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %19 = call i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %5)
  store i64 %19, ptr %6, align 4
  %20 = call noundef i64 @_ZNKSt3setISt4pairIiiESt4lessIS1_ESaIS1_EE5countERKS1_(ptr noundef nonnull align 8 dereferenceable(48) @multi, ptr noundef nonnull align 4 dereferenceable(8) %6)
  %21 = icmp ne i64 %20, 0
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br i1 %21, label %22, label %23

22:                                               ; preds = %18
  store i1 true, ptr %3, align 1
  br label %70

23:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %24 = call i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %5)
  store i64 %24, ptr %7, align 4
  %25 = call { ptr, i8 } @_ZNSt3setISt4pairIiiESt4lessIS1_ESaIS1_EE6insertEOS1_(ptr noundef nonnull align 8 dereferenceable(48) @multi, ptr noundef nonnull align 4 dereferenceable(8) %7)
  %26 = getelementptr inbounds { ptr, i8 }, ptr %8, i32 0, i32 0
  %27 = extractvalue { ptr, i8 } %25, 0
  store ptr %27, ptr %26, align 8
  %28 = getelementptr inbounds { ptr, i8 }, ptr %8, i32 0, i32 1
  %29 = extractvalue { ptr, i8 } %25, 1
  store i8 %29, ptr %28, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = call noundef i32 @_Z8dsu_findi(i32 noundef %30)
  store i32 %31, ptr %4, align 4, !tbaa !5
  %32 = load i32, ptr %5, align 4, !tbaa !5
  %33 = call noundef i32 @_Z8dsu_findi(i32 noundef %32)
  store i32 %33, ptr %5, align 4, !tbaa !5
  %34 = load i32, ptr %4, align 4, !tbaa !5
  %35 = load i32, ptr %5, align 4, !tbaa !5
  %36 = icmp eq i32 %34, %35
  br i1 %36, label %37, label %38

37:                                               ; preds = %23
  store i1 false, ptr %3, align 1
  br label %70

38:                                               ; preds = %23
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %40
  %42 = load i32, ptr %41, align 4, !tbaa !5
  %43 = load i32, ptr %5, align 4, !tbaa !5
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !5
  %47 = icmp sgt i32 %42, %46
  br i1 %47, label %48, label %49

48:                                               ; preds = %38
  call void @_ZSt4swapIiENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %5) #3
  br label %49

49:                                               ; preds = %48, %38
  %50 = load i32, ptr %4, align 4, !tbaa !5
  %51 = sext i32 %50 to i64
  %52 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %51
  %53 = load i32, ptr %52, align 4, !tbaa !5
  %54 = load i32, ptr %5, align 4, !tbaa !5
  %55 = sext i32 %54 to i64
  %56 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %55
  %57 = load i32, ptr %56, align 4, !tbaa !5
  %58 = icmp eq i32 %53, %57
  br i1 %58, label %59, label %65

59:                                               ; preds = %49
  %60 = load i32, ptr %4, align 4, !tbaa !5
  %61 = sext i32 %60 to i64
  %62 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %61
  %63 = load i32, ptr %62, align 4, !tbaa !5
  %64 = add nsw i32 %63, -1
  store i32 %64, ptr %62, align 4, !tbaa !5
  br label %65

65:                                               ; preds = %59, %49
  %66 = load i32, ptr %4, align 4, !tbaa !5
  %67 = load i32, ptr %5, align 4, !tbaa !5
  %68 = sext i32 %67 to i64
  %69 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %68
  store i32 %66, ptr %69, align 4, !tbaa !5
  store i1 true, ptr %3, align 1
  br label %70

70:                                               ; preds = %65, %37, %22, %12
  %71 = load i1, ptr %3, align 1
  ret i1 %71
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZSt4swapIiENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i64 @_ZNKSt3setISt4pairIiiESt4lessIS1_ESaIS1_EE5countERKS1_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(8)) #0 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress uwtable
declare dso_local i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(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.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt3setISt4pairIiiESt4lessIS1_ESaIS1_EE6insertEOS1_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(8)) #0 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 = { inlinehint 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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"}


; 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<std::pair<int, int>, std::pair<int, int>, std::_Identity<std::pair<int, int>>, std::less<std::pair<int, int>>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<std::pair<int, int>, std::pair<int, int>, std::_Identity<std::pair<int, int>>, std::less<std::pair<int, 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 { i32, i32 }

@dsu = external dso_local local_unnamed_addr global [100001 x i32], align 16
@multi = external dso_local global %"class.std::set", align 8

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z8dsu_findi(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z9dsu_mergeii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca %"struct.std::pair", align 8
  %6 = alloca %"struct.std::pair", align 8
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %7 = icmp eq i32 %0, %1
  br i1 %7, label %42, label %8

8:                                                ; preds = %2
  %9 = icmp sgt i32 %0, %1
  br i1 %9, label %10, label %11

10:                                               ; preds = %8
  call void @_ZSt4swapIiENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %4) #3
  br label %11

11:                                               ; preds = %10, %8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %5) #3
  %12 = call i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
  store i64 %12, ptr %5, align 8
  %13 = call noundef i64 @_ZNKSt3setISt4pairIiiESt4lessIS1_ESaIS1_EE5countERKS1_(ptr noundef nonnull align 8 dereferenceable(48) @multi, ptr noundef nonnull align 4 dereferenceable(8) %5)
  %.not = icmp eq i64 %13, 0
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #3
  br i1 %.not, label %14, label %42

14:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %6) #3
  %15 = call i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
  store i64 %15, ptr %6, align 8
  %16 = call { ptr, i8 } @_ZNSt3setISt4pairIiiESt4lessIS1_ESaIS1_EE6insertEOS1_(ptr noundef nonnull align 8 dereferenceable(48) @multi, ptr noundef nonnull align 4 dereferenceable(8) %6)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %6) #3
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = call noundef i32 @_Z8dsu_findi(i32 noundef %17)
  store i32 %18, ptr %3, align 4, !tbaa !5
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = call noundef i32 @_Z8dsu_findi(i32 noundef %19)
  store i32 %20, ptr %4, align 4, !tbaa !5
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = icmp eq i32 %21, %20
  br i1 %22, label %42, label %23

23:                                               ; preds = %14
  %24 = sext i32 %21 to i64
  %25 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = sext i32 %20 to i64
  %28 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = icmp sgt i32 %26, %29
  br i1 %30, label %31, label %32

31:                                               ; preds = %23
  call void @_ZSt4swapIiENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %4) #3
  %.pre = load i32, ptr %3, align 4, !tbaa !5
  %.phi.trans.insert = sext i32 %.pre to i64
  %.phi.trans.insert6 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %.phi.trans.insert
  %.pre7 = load i32, ptr %.phi.trans.insert6, align 4, !tbaa !5
  %.pre8 = load i32, ptr %4, align 4, !tbaa !5
  %.phi.trans.insert9 = sext i32 %.pre8 to i64
  %.phi.trans.insert10 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %.phi.trans.insert9
  %.pre11 = load i32, ptr %.phi.trans.insert10, align 4, !tbaa !5
  br label %32

32:                                               ; preds = %31, %23
  %.pre-phi12 = phi i64 [ %.phi.trans.insert9, %31 ], [ %27, %23 ]
  %.pre-phi = phi i64 [ %.phi.trans.insert, %31 ], [ %24, %23 ]
  %33 = phi i32 [ %.pre11, %31 ], [ %29, %23 ]
  %34 = phi i32 [ %.pre7, %31 ], [ %26, %23 ]
  %35 = phi i32 [ %.pre, %31 ], [ %21, %23 ]
  %36 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %.pre-phi12
  %37 = icmp eq i32 %34, %33
  br i1 %37, label %38, label %41

38:                                               ; preds = %32
  %39 = getelementptr inbounds [100001 x i32], ptr @dsu, i64 0, i64 %.pre-phi
  %40 = add nsw i32 %33, -1
  store i32 %40, ptr %39, align 4, !tbaa !5
  br label %41

41:                                               ; preds = %38, %32
  store i32 %35, ptr %36, align 4, !tbaa !5
  br label %42

42:                                               ; preds = %14, %11, %2, %41
  %.0 = phi i1 [ true, %41 ], [ true, %2 ], [ true, %11 ], [ false, %14 ]
  ret i1 %.0
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZSt4swapIiENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i64 @_ZNKSt3setISt4pairIiiESt4lessIS1_ESaIS1_EE5countERKS1_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(8)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress uwtable
declare dso_local i64 @_ZSt9make_pairIRiS0_ESt4pairINSt25__strip_reference_wrapperINSt5decayIT_E4typeEE6__typeENS2_INS3_IT0_E4typeEE6__typeEEOS4_OS9_(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.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt3setISt4pairIiiESt4lessIS1_ESaIS1_EE6insertEOS1_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(8)) local_unnamed_addr #0 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 = { inlinehint 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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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"}


; Effective O3 passes: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,SROAPass,SimplifyCFGPass