; LLVM IR from VAR-solutions/Algorithms :: data structures/linked list/cpp (doubly_circular_linked_list)

; 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::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%struct.node = type { i32, ptr, ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [24 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [46 x i8], align 1
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@.str.2 = external hidden unnamed_addr constant [56 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_Z7getNodev() #0

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

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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z16createLinkedListRP4node(ptr noundef nonnull align 8 dereferenceable(8) %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %9 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef @.str)
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  %10 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef @.str.1)
  %11 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %12 = load i32, ptr %3, align 4, !tbaa !9
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %15

14:                                               ; preds = %1
  store i32 1, ptr %4, align 4
  br label %51

15:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %16 = load ptr, ptr %2, align 8, !tbaa !5
  %17 = load ptr, ptr %16, align 8, !tbaa !5
  store ptr %17, ptr %5, align 8, !tbaa !5
  %18 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef @.str.2)
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %47, %15
  %20 = load i32, ptr %6, align 4, !tbaa !9
  %21 = load i32, ptr %3, align 4, !tbaa !9
  %22 = icmp slt i32 %20, %21
  br i1 %22, label %24, label %23

23:                                               ; preds = %19
  store i32 2, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  br label %50

24:                                               ; preds = %19
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  %25 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %7)
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %26 = call noundef ptr @_Z7getNodev()
  store ptr %26, ptr %8, align 8, !tbaa !5
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.node, ptr %28, i32 0, i32 1
  store ptr %27, ptr %29, align 8, !tbaa !11
  %30 = load i32, ptr %7, align 4, !tbaa !9
  %31 = load ptr, ptr %8, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.node, ptr %31, i32 0, i32 0
  store i32 %30, ptr %32, align 8, !tbaa !13
  %33 = load ptr, ptr %2, align 8, !tbaa !5
  %34 = load ptr, ptr %33, align 8, !tbaa !5
  %35 = load ptr, ptr %8, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.node, ptr %35, i32 0, i32 1
  store ptr %34, ptr %36, align 8, !tbaa !11
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = load ptr, ptr %8, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.node, ptr %38, i32 0, i32 2
  store ptr %37, ptr %39, align 8, !tbaa !14
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.node, ptr %40, i32 0, i32 1
  %42 = load ptr, ptr %41, align 8, !tbaa !11
  store ptr %42, ptr %5, align 8, !tbaa !5
  %43 = load ptr, ptr %8, align 8, !tbaa !5
  %44 = load ptr, ptr %2, align 8, !tbaa !5
  %45 = load ptr, ptr %44, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.node, ptr %45, i32 0, i32 2
  store ptr %43, ptr %46, align 8, !tbaa !14
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %47

47:                                               ; preds = %24
  %48 = load i32, ptr %6, align 4, !tbaa !9
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %6, align 4, !tbaa !9
  br label %19, !llvm.loop !15

50:                                               ; preds = %23
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  store i32 0, ptr %4, align 4
  br label %51

51:                                               ; preds = %50, %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  %52 = load i32, ptr %4, align 4
  switch i32 %52, label %54 [
    i32 0, label %53
    i32 1, label %53
  ]

53:                                               ; preds = %51, %51
  ret void

54:                                               ; preds = %51
  unreachable
}

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #2

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #3

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 = { 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 = { "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, !6, i64 8}
!12 = !{!"_ZTS4node", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !10, i64 0}
!14 = !{!12, !6, i64 16}
!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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [24 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [46 x i8], align 1
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@.str.2 = external hidden unnamed_addr constant [56 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_Z7getNodev() local_unnamed_addr #0

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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z16createLinkedListRP4node(ptr nocapture noundef nonnull readonly align 8 dereferenceable(8) %0) local_unnamed_addr #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef nonnull @.str)
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #4
  %5 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef nonnull @.str.1)
  %6 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = icmp eq i32 %7, 0
  br i1 %8, label %.loopexit, label %9

9:                                                ; preds = %1
  %10 = load ptr, ptr %0, align 8, !tbaa !9
  %11 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef nonnull @.str.2)
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %9, %.lr.ph
  %.014 = phi i32 [ %24, %.lr.ph ], [ 0, %9 ]
  %.01213 = phi ptr [ %21, %.lr.ph ], [ %10, %9 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #4
  %14 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %15 = call noundef ptr @_Z7getNodev()
  %16 = getelementptr inbounds i8, ptr %.01213, i64 8
  store ptr %15, ptr %16, align 8, !tbaa !11
  %17 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %17, ptr %15, align 8, !tbaa !13
  %18 = load ptr, ptr %0, align 8, !tbaa !9
  %19 = getelementptr inbounds i8, ptr %15, i64 8
  store ptr %18, ptr %19, align 8, !tbaa !11
  %20 = getelementptr inbounds i8, ptr %15, i64 16
  store ptr %.01213, ptr %20, align 8, !tbaa !14
  %21 = load ptr, ptr %16, align 8, !tbaa !11
  %22 = load ptr, ptr %0, align 8, !tbaa !9
  %23 = getelementptr inbounds i8, ptr %22, i64 16
  store ptr %15, ptr %23, align 8, !tbaa !14
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #4
  %24 = add nuw nsw i32 %.014, 1
  %25 = load i32, ptr %2, align 4, !tbaa !5
  %26 = icmp slt i32 %24, %25
  br i1 %26, label %.lr.ph, label %.loopexit, !llvm.loop !15

.loopexit:                                        ; preds = %.lr.ph, %9, %1
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #4
  ret void
}

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #2

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #3

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 = { 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 = { "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 = !{!"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 = !{!"_ZTS4node", !6, i64 0, !10, i64 8, !10, i64 16}
!13 = !{!12, !6, i64 0}
!14 = !{!12, !10, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


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