; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 11. Linked List/26 Find Nth Node From End Of LL (26a Find Nth Node From End Of LL)

; 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.Node = type { i32, ptr }

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z7NthNodeRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #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
declare dso_local void @_Z5printP4Node(ptr noundef) #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #2 personality ptr @__gxx_personality_v0 {
  %1 = alloca i32, align 4
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #6
  %5 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 16) #7
  invoke void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %5, i32 noundef 10)
          to label %6 unwind label %18

6:                                                ; preds = %0
  store ptr %5, ptr %2, align 8, !tbaa !5
  %7 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 16) #7
  invoke void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %7, i32 noundef 20)
          to label %8 unwind label %22

8:                                                ; preds = %6
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %class.Node, ptr %9, i32 0, i32 1
  store ptr %7, ptr %10, align 8, !tbaa !9
  %11 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 16) #7
  invoke void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %11, i32 noundef 30)
          to label %12 unwind label %26

12:                                               ; preds = %8
  %13 = load ptr, ptr %2, align 8, !tbaa !5
  %14 = getelementptr inbounds %class.Node, ptr %13, i32 0, i32 1
  %15 = load ptr, ptr %14, align 8, !tbaa !9
  %16 = getelementptr inbounds %class.Node, ptr %15, i32 0, i32 1
  store ptr %11, ptr %16, align 8, !tbaa !9
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  call void @_Z5printP4Node(ptr noundef %17)
  call void @_Z7NthNodeRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8) %2, i32 noundef 2)
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #6
  ret i32 0

18:                                               ; preds = %0
  %19 = landingpad { ptr, i32 }
          cleanup
  %20 = extractvalue { ptr, i32 } %19, 0
  store ptr %20, ptr %3, align 8
  %21 = extractvalue { ptr, i32 } %19, 1
  store i32 %21, ptr %4, align 4
  call void @_ZdlPvm(ptr noundef %5, i64 noundef 16) #8
  br label %30

22:                                               ; preds = %6
  %23 = landingpad { ptr, i32 }
          cleanup
  %24 = extractvalue { ptr, i32 } %23, 0
  store ptr %24, ptr %3, align 8
  %25 = extractvalue { ptr, i32 } %23, 1
  store i32 %25, ptr %4, align 4
  call void @_ZdlPvm(ptr noundef %7, i64 noundef 16) #8
  br label %30

26:                                               ; preds = %8
  %27 = landingpad { ptr, i32 }
          cleanup
  %28 = extractvalue { ptr, i32 } %27, 0
  store ptr %28, ptr %3, align 8
  %29 = extractvalue { ptr, i32 } %27, 1
  store i32 %29, ptr %4, align 4
  call void @_ZdlPvm(ptr noundef %11, i64 noundef 16) #8
  br label %30

30:                                               ; preds = %26, %22, %18
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #6
  br label %31

31:                                               ; preds = %30
  %32 = load ptr, ptr %3, align 8
  %33 = load i32, ptr %4, align 4
  %34 = insertvalue { ptr, i32 } poison, ptr %32, 0
  %35 = insertvalue { ptr, i32 } %34, i32 %33, 1
  resume { ptr, i32 } %35
}

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) #3

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) unnamed_addr #4 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #5

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 = { mustprogress norecurse 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 = { nobuiltin allocsize(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 = { 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 #5 = { nobuiltin nounwind "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 #6 = { nounwind }
attributes #7 = { builtin allocsize(0) }
attributes #8 = { builtin 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, !6, i64 8}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}


; 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 void @_Z7NthNodeRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) 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
declare dso_local void @_Z5printP4Node(ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #2 personality ptr @__gxx_personality_v0 {
  %1 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %1) #5
  %2 = tail call noalias noundef nonnull dereferenceable(16) ptr @_Znwm(i64 noundef 16) #6
  tail call void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %2, i32 noundef 10)
  store ptr %2, ptr %1, align 8, !tbaa !5
  %3 = tail call noalias noundef nonnull dereferenceable(16) ptr @_Znwm(i64 noundef 16) #6
  tail call void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %3, i32 noundef 20)
  %4 = getelementptr inbounds i8, ptr %2, i64 8
  store ptr %3, ptr %4, align 8, !tbaa !9
  %5 = tail call noalias noundef nonnull dereferenceable(16) ptr @_Znwm(i64 noundef 16) #6
  tail call void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %5, i32 noundef 30)
  %6 = load ptr, ptr %4, align 8, !tbaa !9
  %7 = getelementptr inbounds i8, ptr %6, i64 8
  store ptr %5, ptr %7, align 8, !tbaa !9
  tail call void @_Z5printP4Node(ptr noundef nonnull %2)
  call void @_Z7NthNodeRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8) %1, i32 noundef 2)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %1) #5
  ret i32 0
}

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) local_unnamed_addr #3

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) unnamed_addr #4 align 2

declare i32 @__gxx_personality_v0(...)

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 = { mustprogress norecurse 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 = { nobuiltin allocsize(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 = { 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 #5 = { nounwind }
attributes #6 = { builtin allocsize(0) }

!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, !6, i64 8}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,SROAPass,SimplifyCFGPass,TailCallElimPass