; LLVM IR from manishbisht/Competitive-Programming :: Data Structures/07 Disjoint Set/DisjointSet.ll (Z13elementsInSeti)

; 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" = type { %"class.std::_Rb_tree" }
%"class.std::_Rb_tree" = type { %"struct.std::_Rb_tree<int, std::pair<const int, disjointSetNode *>, std::_Select1st<std::pair<const int, disjointSetNode *>>, std::less<int>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<int, std::pair<const int, disjointSetNode *>, std::_Select1st<std::pair<const int, disjointSetNode *>>, 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.disjointSetNode = type { i32, i32, ptr, i32 }

@disjointSet = external dso_local global %"class.std::map", align 8

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

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt3mapIiP15disjointSetNodeSt4lessIiESaISt4pairIKiS1_EEEixERS5_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(4)) #1 align 2

; 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
define dso_local noundef i32 @_Z13elementsInSeti(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %4 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt3mapIiP15disjointSetNodeSt4lessIiESaISt4pairIKiS1_EEEixERS5_(ptr noundef nonnull align 8 dereferenceable(48) @disjointSet, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %5 = load ptr, ptr %4, align 8, !tbaa !9
  %6 = getelementptr inbounds %struct.disjointSetNode, ptr %5, i32 0, i32 2
  %7 = load ptr, ptr %6, align 8, !tbaa !11
  store ptr %7, ptr %3, align 8, !tbaa !9
  br label %8

8:                                                ; preds = %14, %1
  %9 = load ptr, ptr %3, align 8, !tbaa !9
  %10 = getelementptr inbounds %struct.disjointSetNode, ptr %9, i32 0, i32 2
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = load ptr, ptr %3, align 8, !tbaa !9
  %13 = icmp ne ptr %11, %12
  br i1 %13, label %14, label %18

14:                                               ; preds = %8
  %15 = load ptr, ptr %3, align 8, !tbaa !9
  %16 = getelementptr inbounds %struct.disjointSetNode, ptr %15, i32 0, i32 2
  %17 = load ptr, ptr %16, align 8, !tbaa !11
  store ptr %17, ptr %3, align 8, !tbaa !9
  br label %8, !llvm.loop !13

18:                                               ; preds = %8
  %19 = load ptr, ptr %3, align 8, !tbaa !9
  %20 = getelementptr inbounds %struct.disjointSetNode, ptr %19, i32 0, i32 3
  %21 = load i32, ptr %20, align 8, !tbaa !15
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i32 %21
}

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 = { 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 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !10, i64 8}
!12 = !{!"_ZTS15disjointSetNode", !6, i64 0, !6, i64 4, !10, i64 8, !6, i64 16}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!12, !6, i64 16}


; 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" = type { %"class.std::_Rb_tree" }
%"class.std::_Rb_tree" = type { %"struct.std::_Rb_tree<int, std::pair<const int, disjointSetNode *>, std::_Select1st<std::pair<const int, disjointSetNode *>>, std::less<int>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<int, std::pair<const int, disjointSetNode *>, std::_Select1st<std::pair<const int, disjointSetNode *>>, 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 }

@disjointSet = external dso_local global %"class.std::map", align 8

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt3mapIiP15disjointSetNodeSt4lessIiESaISt4pairIKiS1_EEEixERS5_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z13elementsInSeti(i32 noundef %0) local_unnamed_addr #0 {
  %2 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  %3 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt3mapIiP15disjointSetNodeSt4lessIiESaISt4pairIKiS1_EEEixERS5_(ptr noundef nonnull align 8 dereferenceable(48) @disjointSet, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %4 = load ptr, ptr %3, align 8, !tbaa !9
  %5 = getelementptr inbounds i8, ptr %4, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !11
  br label %7

7:                                                ; preds = %7, %1
  %.0 = phi ptr [ %6, %1 ], [ %9, %7 ]
  %8 = getelementptr inbounds i8, ptr %.0, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !11
  %.not = icmp eq ptr %9, %.0
  br i1 %.not, label %10, label %7, !llvm.loop !13

10:                                               ; preds = %7
  %11 = getelementptr inbounds i8, ptr %.0, i64 16
  %12 = load i32, ptr %11, align 8, !tbaa !15
  ret i32 %12
}

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" }

!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 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !10, i64 8}
!12 = !{!"_ZTS15disjointSetNode", !6, i64 0, !6, i64 4, !10, i64 8, !6, i64 16}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!12, !6, i64 16}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopUnrollPass,SROAPass,SimplifyCFGPass