; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/graphs/kruskal_Algorithm.ll (ZN5Graph7kruskalEv)

; 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.__gnu_cxx::__normal_iterator" = type { ptr }
%class.Graph = type <{ %"class.std::vector", %"class.std::vector", ptr, i32, [4 x i8] }>
%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<std::pair<int, std::pair<int, int>>, std::allocator<std::pair<int, std::pair<int, int>>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::pair<int, std::pair<int, int>>, std::allocator<std::pair<int, std::pair<int, int>>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::pair<int, std::pair<int, int>>, std::allocator<std::pair<int, std::pair<int, int>>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::pair<int, std::pair<int, int>>, std::allocator<std::pair<int, std::pair<int, int>>>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"struct.std::pair" = type { i32, %"struct.std::pair.0" }
%"struct.std::pair.0" = type { i32, i32 }

; 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 uwtable
declare dso_local noundef i32 @_ZN5Graph8find_setEi(ptr noundef nonnull align 8 dereferenceable(60), i32 noundef) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN5Graph9union_setEii(ptr noundef nonnull align 8 dereferenceable(60), i32 noundef, i32 noundef) #2 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN5Graph7kruskalEv(ptr noundef nonnull align 8 dereferenceable(60) %0) #1 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %7 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %8 = load ptr, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  %9 = getelementptr inbounds %class.Graph, ptr %8, i32 0, i32 0
  %10 = call ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %9) #4
  %11 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %6, i32 0, i32 0
  store ptr %10, ptr %11, align 8
  %12 = getelementptr inbounds %class.Graph, ptr %8, i32 0, i32 0
  %13 = call ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %12) #4
  %14 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %7, i32 0, i32 0
  store ptr %13, ptr %14, align 8
  %15 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %6, i32 0, i32 0
  %16 = load ptr, ptr %15, align 8
  %17 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %7, i32 0, i32 0
  %18 = load ptr, ptr %17, align 8
  call void @_ZSt4sortIN9__gnu_cxx17__normal_iteratorIPSt4pairIiS2_IiiEESt6vectorIS4_SaIS4_EEEEEvT_SA_(ptr %16, ptr %18)
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %54, %1
  %20 = load i32, ptr %3, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds %class.Graph, ptr %8, i32 0, i32 0
  %23 = call noundef i64 @_ZNKSt6vectorISt4pairIiS0_IiiEESaIS2_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %22) #4
  %24 = icmp ult i64 %21, %23
  br i1 %24, label %25, label %57

25:                                               ; preds = %19
  %26 = getelementptr inbounds %class.Graph, ptr %8, i32 0, i32 0
  %27 = load i32, ptr %3, align 4, !tbaa !9
  %28 = sext i32 %27 to i64
  %29 = call noundef nonnull align 4 dereferenceable(12) ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %26, i64 noundef %28) #4
  %30 = getelementptr inbounds %"struct.std::pair", ptr %29, i32 0, i32 1
  %31 = getelementptr inbounds %"struct.std::pair.0", ptr %30, i32 0, i32 0
  %32 = load i32, ptr %31, align 4, !tbaa !11
  %33 = call noundef i32 @_ZN5Graph8find_setEi(ptr noundef nonnull align 8 dereferenceable(60) %8, i32 noundef %32)
  store i32 %33, ptr %4, align 4, !tbaa !9
  %34 = getelementptr inbounds %class.Graph, ptr %8, i32 0, i32 0
  %35 = load i32, ptr %3, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = call noundef nonnull align 4 dereferenceable(12) ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %34, i64 noundef %36) #4
  %38 = getelementptr inbounds %"struct.std::pair", ptr %37, i32 0, i32 1
  %39 = getelementptr inbounds %"struct.std::pair.0", ptr %38, i32 0, i32 1
  %40 = load i32, ptr %39, align 4, !tbaa !14
  %41 = call noundef i32 @_ZN5Graph8find_setEi(ptr noundef nonnull align 8 dereferenceable(60) %8, i32 noundef %40)
  store i32 %41, ptr %5, align 4, !tbaa !9
  %42 = load i32, ptr %4, align 4, !tbaa !9
  %43 = load i32, ptr %5, align 4, !tbaa !9
  %44 = icmp ne i32 %42, %43
  br i1 %44, label %45, label %53

45:                                               ; preds = %25
  %46 = getelementptr inbounds %class.Graph, ptr %8, i32 0, i32 1
  %47 = getelementptr inbounds %class.Graph, ptr %8, i32 0, i32 0
  %48 = load i32, ptr %3, align 4, !tbaa !9
  %49 = sext i32 %48 to i64
  %50 = call noundef nonnull align 4 dereferenceable(12) ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %47, i64 noundef %49) #4
  call void @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE9push_backERKS2_(ptr noundef nonnull align 8 dereferenceable(24) %46, ptr noundef nonnull align 4 dereferenceable(12) %50)
  %51 = load i32, ptr %4, align 4, !tbaa !9
  %52 = load i32, ptr %5, align 4, !tbaa !9
  call void @_ZN5Graph9union_setEii(ptr noundef nonnull align 8 dereferenceable(60) %8, i32 noundef %51, i32 noundef %52)
  br label %53

53:                                               ; preds = %45, %25
  br label %54

54:                                               ; preds = %53
  %55 = load i32, ptr %3, align 4, !tbaa !9
  %56 = add nsw i32 %55, 1
  store i32 %56, ptr %3, align 4, !tbaa !9
  br label %19, !llvm.loop !15

57:                                               ; preds = %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  ret void
}

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIN9__gnu_cxx17__normal_iteratorIPSt4pairIiS2_IiiEESt6vectorIS4_SaIS4_EEEEEvT_SA_(ptr, ptr) #3

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorISt4pairIiS0_IiiEESaIS2_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(12) ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE9push_backERKS2_(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(12)) #1 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = { inlinehint 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 #4 = { 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 = !{!12, !10, i64 4}
!12 = !{!"_ZTSSt4pairIiS_IiiEE", !10, i64 0, !13, i64 4}
!13 = !{!"_ZTSSt4pairIiiE", !10, i64 0, !10, i64 4}
!14 = !{!12, !10, i64 8}
!15 = distinct !{!15, !16}
!16 = !{!"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"

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_ZN5Graph8find_setEi(ptr noundef nonnull align 8 dereferenceable(60), i32 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN5Graph9union_setEii(ptr noundef nonnull align 8 dereferenceable(60), i32 noundef, i32 noundef) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN5Graph7kruskalEv(ptr noundef nonnull align 8 dereferenceable(60) %0) local_unnamed_addr #0 align 2 {
  %2 = tail call ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #3
  %3 = tail call ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #3
  tail call void @_ZSt4sortIN9__gnu_cxx17__normal_iteratorIPSt4pairIiS2_IiiEESt6vectorIS4_SaIS4_EEEEEvT_SA_(ptr %2, ptr %3)
  %4 = tail call noundef i64 @_ZNKSt6vectorISt4pairIiS0_IiiEESaIS2_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #3
  %.not14 = icmp eq i64 %4, 0
  br i1 %.not14, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1
  %5 = getelementptr inbounds i8, ptr %0, i64 24
  br label %6

6:                                                ; preds = %.lr.ph, %17
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %17 ]
  %7 = tail call noundef nonnull align 4 dereferenceable(12) ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %indvars.iv) #3
  %8 = getelementptr inbounds i8, ptr %7, i64 4
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = tail call noundef i32 @_ZN5Graph8find_setEi(ptr noundef nonnull align 8 dereferenceable(60) %0, i32 noundef %9)
  %11 = tail call noundef nonnull align 4 dereferenceable(12) ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %indvars.iv) #3
  %12 = getelementptr inbounds i8, ptr %11, i64 8
  %13 = load i32, ptr %12, align 4, !tbaa !11
  %14 = tail call noundef i32 @_ZN5Graph8find_setEi(ptr noundef nonnull align 8 dereferenceable(60) %0, i32 noundef %13)
  %.not = icmp eq i32 %10, %14
  br i1 %.not, label %17, label %15

15:                                               ; preds = %6
  %16 = tail call noundef nonnull align 4 dereferenceable(12) ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %indvars.iv) #3
  tail call void @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE9push_backERKS2_(ptr noundef nonnull align 8 dereferenceable(24) %5, ptr noundef nonnull align 4 dereferenceable(12) %16)
  tail call void @_ZN5Graph9union_setEii(ptr noundef nonnull align 8 dereferenceable(60) %0, i32 noundef %10, i32 noundef %14)
  br label %17

17:                                               ; preds = %6, %15
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %18 = tail call noundef i64 @_ZNKSt6vectorISt4pairIiS0_IiiEESaIS2_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #3
  %19 = icmp ugt i64 %18, %indvars.iv.next
  br i1 %19, label %6, label %._crit_edge, !llvm.loop !12

._crit_edge:                                      ; preds = %17, %1
  ret void
}

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIN9__gnu_cxx17__normal_iteratorIPSt4pairIiS2_IiiEESt6vectorIS4_SaIS4_EEEEEvT_SA_(ptr, ptr) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorISt4pairIiS0_IiiEESaIS2_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(12) ptr @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorISt4pairIiS0_IiiEESaIS2_EE9push_backERKS2_(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(12)) 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 = { 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 = { inlinehint 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, !7, i64 4}
!6 = !{!"_ZTSSt4pairIiS_IiiEE", !7, i64 0, !10, i64 4}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"_ZTSSt4pairIiiE", !7, i64 0, !7, i64 4}
!11 = !{!6, !7, i64 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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