; LLVM IR from TheAlgorithms/C-Plus-Plus :: data_structures/linkedlist_implentation_usingarray.ll (Z14insertAtTheEndi)

; 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, i32 }

@AvailArray = external dso_local global [100 x %struct.Node], align 16
@head = external dso_local global i32, align 4

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

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7getnodev() #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z14insertAtTheEndi(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %5 = call noundef i32 @_Z7getnodev()
  store i32 %5, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %6 = load i32, ptr @head, align 4, !tbaa !5
  store i32 %6, ptr %4, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %14, %1
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [100 x %struct.Node], ptr @AvailArray, i64 0, i64 %9
  %11 = getelementptr inbounds %struct.Node, ptr %10, i32 0, i32 1
  %12 = load i32, ptr %11, align 4, !tbaa !9
  %13 = icmp ne i32 %12, -1
  br i1 %13, label %14, label %20

14:                                               ; preds = %7
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [100 x %struct.Node], ptr @AvailArray, i64 0, i64 %16
  %18 = getelementptr inbounds %struct.Node, ptr %17, i32 0, i32 1
  %19 = load i32, ptr %18, align 4, !tbaa !9
  store i32 %19, ptr %4, align 4, !tbaa !5
  br label %7, !llvm.loop !11

20:                                               ; preds = %7
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds [100 x %struct.Node], ptr @AvailArray, i64 0, i64 %23
  %25 = getelementptr inbounds %struct.Node, ptr %24, i32 0, i32 0
  store i32 %21, ptr %25, align 8, !tbaa !13
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [100 x %struct.Node], ptr @AvailArray, i64 0, i64 %27
  %29 = getelementptr inbounds %struct.Node, ptr %28, i32 0, i32 1
  store i32 -1, ptr %29, align 4, !tbaa !9
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [100 x %struct.Node], ptr @AvailArray, i64 0, i64 %32
  %34 = getelementptr inbounds %struct.Node, ptr %33, i32 0, i32 1
  store i32 %30, ptr %34, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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, !6, i64 4}
!10 = !{!"_ZTS4Node", !6, i64 0, !6, i64 4}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!10, !6, 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"

%struct.Node = type { i32, i32 }

@AvailArray = external dso_local local_unnamed_addr global [100 x %struct.Node], align 16
@head = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7getnodev() local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z14insertAtTheEndi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = tail call noundef i32 @_Z7getnodev()
  %3 = load i32, ptr @head, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %4, %1
  %.0 = phi i32 [ %3, %1 ], [ %7, %4 ]
  %5 = sext i32 %.0 to i64
  %6 = getelementptr inbounds [100 x %struct.Node], ptr @AvailArray, i64 0, i64 %5, i32 1
  %7 = load i32, ptr %6, align 4, !tbaa !9
  %.not = icmp eq i32 %7, -1
  br i1 %.not, label %8, label %4, !llvm.loop !11

8:                                                ; preds = %4
  %9 = getelementptr inbounds [100 x %struct.Node], ptr @AvailArray, i64 0, i64 %5, i32 1
  %10 = sext i32 %2 to i64
  %11 = getelementptr inbounds [100 x %struct.Node], ptr @AvailArray, i64 0, i64 %10
  store i32 %0, ptr %11, align 8, !tbaa !13
  %12 = getelementptr inbounds i8, ptr %11, i64 4
  store i32 -1, ptr %12, align 4, !tbaa !9
  store i32 %2, ptr %9, align 4, !tbaa !9
  ret void
}

attributes #0 = { 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" }

!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, !6, i64 4}
!10 = !{!"_ZTS4Node", !6, i64 0, !6, i64 4}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!10, !6, i64 0}


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