; LLVM IR from mahendramahara/DSA-in-C-Programing :: CIRCULAR-LINKED-LIST/CIRCULAR-DOUBLY (DeleteBEG)

; 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"

%struct.Node = type { i32, ptr, ptr }

@head = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local ptr @createNode(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: nounwind uwtable
define dso_local void @insertAtLast(i32 noundef %0) #0 {
  %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 = load i32, ptr %2, align 4, !tbaa !5
  %5 = call ptr @createNode(i32 noundef %4)
  store ptr %5, ptr %3, align 8, !tbaa !9
  %6 = load ptr, ptr @head, align 8, !tbaa !9
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %15

8:                                                ; preds = %1
  %9 = load ptr, ptr %3, align 8, !tbaa !9
  store ptr %9, ptr @head, align 8, !tbaa !9
  %10 = load ptr, ptr %3, align 8, !tbaa !9
  %11 = load ptr, ptr @head, align 8, !tbaa !9
  %12 = getelementptr inbounds %struct.Node, ptr %11, i32 0, i32 2
  store ptr %10, ptr %12, align 8, !tbaa !11
  %13 = load ptr, ptr @head, align 8, !tbaa !9
  %14 = getelementptr inbounds %struct.Node, ptr %13, i32 0, i32 1
  store ptr %10, ptr %14, align 8, !tbaa !13
  br label %32

15:                                               ; preds = %1
  %16 = load ptr, ptr @head, align 8, !tbaa !9
  %17 = getelementptr inbounds %struct.Node, ptr %16, i32 0, i32 2
  %18 = load ptr, ptr %17, align 8, !tbaa !11
  %19 = load ptr, ptr %3, align 8, !tbaa !9
  %20 = getelementptr inbounds %struct.Node, ptr %19, i32 0, i32 2
  store ptr %18, ptr %20, align 8, !tbaa !11
  %21 = load ptr, ptr @head, align 8, !tbaa !9
  %22 = load ptr, ptr %3, align 8, !tbaa !9
  %23 = getelementptr inbounds %struct.Node, ptr %22, i32 0, i32 1
  store ptr %21, ptr %23, align 8, !tbaa !13
  %24 = load ptr, ptr %3, align 8, !tbaa !9
  %25 = load ptr, ptr @head, align 8, !tbaa !9
  %26 = getelementptr inbounds %struct.Node, ptr %25, i32 0, i32 2
  %27 = load ptr, ptr %26, align 8, !tbaa !11
  %28 = getelementptr inbounds %struct.Node, ptr %27, i32 0, i32 1
  store ptr %24, ptr %28, align 8, !tbaa !13
  %29 = load ptr, ptr %3, align 8, !tbaa !9
  %30 = load ptr, ptr @head, align 8, !tbaa !9
  %31 = getelementptr inbounds %struct.Node, ptr %30, i32 0, i32 2
  store ptr %29, ptr %31, align 8, !tbaa !11
  br label %32

32:                                               ; preds = %15, %8
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret void
}

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !10, i64 16}
!12 = !{!"Node", !6, i64 0, !10, i64 8, !10, i64 16}
!13 = !{!12, !10, 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"

@head = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local ptr @createNode(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @insertAtLast(i32 noundef %0) local_unnamed_addr #0 {
  %2 = tail call ptr @createNode(i32 noundef %0)
  %3 = load ptr, ptr @head, align 8, !tbaa !5
  %4 = icmp eq ptr %3, null
  br i1 %4, label %5, label %8

5:                                                ; preds = %1
  store ptr %2, ptr @head, align 8, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %2, i64 16
  store ptr %2, ptr %6, align 8, !tbaa !9
  %7 = getelementptr inbounds i8, ptr %2, i64 8
  br label %14

8:                                                ; preds = %1
  %9 = getelementptr inbounds i8, ptr %3, i64 16
  %10 = load ptr, ptr %9, align 8, !tbaa !9
  %11 = getelementptr inbounds i8, ptr %2, i64 16
  store ptr %10, ptr %11, align 8, !tbaa !9
  %12 = getelementptr inbounds i8, ptr %2, i64 8
  store ptr %3, ptr %12, align 8, !tbaa !12
  %13 = getelementptr inbounds i8, ptr %10, i64 8
  store ptr %2, ptr %13, align 8, !tbaa !12
  br label %14

14:                                               ; preds = %8, %5
  %.sink = phi ptr [ %9, %8 ], [ %7, %5 ]
  store ptr %2, ptr %.sink, align 8, !tbaa !5
  ret void
}

attributes #0 = { 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" }

!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/C++ TBAA"}
!9 = !{!10, !6, i64 16}
!10 = !{!"Node", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}


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