; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 10. Linked List/cpp/Circular_Double_List.ll (Z13insertAtbeginPP4Nodei)

; 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, ptr }

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

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) #1

; 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 void @_Z13insertAtbeginPP4Nodei(ptr noundef %0, i32 noundef %1) #2 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %8 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 24) #4
  store ptr %8, ptr %5, align 8, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !9
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = getelementptr inbounds %class.Node, ptr %10, i32 0, i32 0
  store i32 %9, ptr %11, align 8, !tbaa !11
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = load ptr, ptr %12, align 8, !tbaa !5
  %14 = icmp eq ptr %13, null
  br i1 %14, label %15, label %23

15:                                               ; preds = %2
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = getelementptr inbounds %class.Node, ptr %17, i32 0, i32 2
  store ptr %16, ptr %18, align 8, !tbaa !13
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = getelementptr inbounds %class.Node, ptr %19, i32 0, i32 1
  store ptr %16, ptr %20, align 8, !tbaa !14
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %21, ptr %22, align 8, !tbaa !5
  store i32 1, ptr %6, align 4
  br label %44

23:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = load ptr, ptr %24, align 8, !tbaa !5
  %26 = getelementptr inbounds %class.Node, ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !14
  store ptr %27, ptr %7, align 8, !tbaa !5
  %28 = load ptr, ptr %7, align 8, !tbaa !5
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = getelementptr inbounds %class.Node, ptr %29, i32 0, i32 1
  store ptr %28, ptr %30, align 8, !tbaa !14
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = load ptr, ptr %31, align 8, !tbaa !5
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = getelementptr inbounds %class.Node, ptr %33, i32 0, i32 2
  store ptr %32, ptr %34, align 8, !tbaa !13
  %35 = load ptr, ptr %5, align 8, !tbaa !5
  %36 = load ptr, ptr %7, align 8, !tbaa !5
  %37 = getelementptr inbounds %class.Node, ptr %36, i32 0, i32 2
  store ptr %35, ptr %37, align 8, !tbaa !13
  %38 = load ptr, ptr %5, align 8, !tbaa !5
  %39 = load ptr, ptr %3, align 8, !tbaa !5
  %40 = load ptr, ptr %39, align 8, !tbaa !5
  %41 = getelementptr inbounds %class.Node, ptr %40, i32 0, i32 1
  store ptr %38, ptr %41, align 8, !tbaa !14
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  %43 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %42, ptr %43, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  store i32 0, ptr %6, align 4
  br label %44

44:                                               ; preds = %23, %15
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  %45 = load i32, ptr %6, align 4
  switch i32 %45, label %47 [
    i32 0, label %46
    i32 1, label %46
  ]

46:                                               ; preds = %44, %44
  ret void

47:                                               ; preds = %44
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 }
attributes #4 = { 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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"_ZTS4Node", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 16}
!14 = !{!12, !6, i64 8}


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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z13insertAtbeginPP4Nodei(ptr nocapture noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = tail call noalias noundef nonnull dereferenceable(24) ptr @_Znwm(i64 noundef 24) #2
  store i32 %1, ptr %3, align 8, !tbaa !5
  %4 = load ptr, ptr %0, align 8, !tbaa !11
  %5 = icmp eq ptr %4, null
  %6 = getelementptr inbounds i8, ptr %3, i64 8
  br i1 %5, label %7, label %9

7:                                                ; preds = %2
  %8 = getelementptr inbounds i8, ptr %3, i64 16
  store ptr %3, ptr %8, align 8, !tbaa !12
  br label %16

9:                                                ; preds = %2
  %10 = getelementptr inbounds i8, ptr %4, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !13
  store ptr %11, ptr %6, align 8, !tbaa !13
  %12 = getelementptr inbounds i8, ptr %3, i64 16
  store ptr %4, ptr %12, align 8, !tbaa !12
  %13 = getelementptr inbounds i8, ptr %11, i64 16
  store ptr %3, ptr %13, align 8, !tbaa !12
  %14 = load ptr, ptr %0, align 8, !tbaa !11
  %15 = getelementptr inbounds i8, ptr %14, i64 8
  br label %16

16:                                               ; preds = %9, %7
  %.sink = phi ptr [ %15, %9 ], [ %6, %7 ]
  store ptr %3, ptr %.sink, align 8, !tbaa !13
  store ptr %3, ptr %0, align 8, !tbaa !11
  ret void
}

attributes #0 = { 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 #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 = { 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, !7, i64 0}
!6 = !{!"_ZTS4Node", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!10, !10, i64 0}
!12 = !{!6, !10, i64 16}
!13 = !{!6, !10, i64 8}


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