; LLVM IR from KishanBGajera/2024-366-Days-Of-DSA :: Data Structures/Non-Linear/Tree/N-ary Tree/C (main)

; 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, i32 }

; 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: nounwind uwtable
define dso_local ptr @searchNode(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.Node, ptr %9, i32 0, i32 0
  %11 = load i32, ptr %10, align 8, !tbaa !11
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = icmp eq i32 %11, %12
  br i1 %13, label %14, label %16

14:                                               ; preds = %2
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %15, ptr %3, align 8
  br label %49

16:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %42, %16
  %18 = load i32, ptr %6, align 4, !tbaa !9
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.Node, ptr %19, i32 0, i32 2
  %21 = load i32, ptr %20, align 8, !tbaa !13
  %22 = icmp slt i32 %18, %21
  br i1 %22, label %24, label %23

23:                                               ; preds = %17
  store i32 2, ptr %7, align 4
  br label %45

24:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %25 = load ptr, ptr %4, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.Node, ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !14
  %28 = load i32, ptr %6, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds ptr, ptr %27, i64 %29
  %31 = load ptr, ptr %30, align 8, !tbaa !5
  %32 = load i32, ptr %5, align 4, !tbaa !9
  %33 = call ptr @searchNode(ptr noundef %31, i32 noundef %32)
  store ptr %33, ptr %8, align 8, !tbaa !5
  %34 = load ptr, ptr %8, align 8, !tbaa !5
  %35 = icmp ne ptr %34, null
  br i1 %35, label %36, label %38

36:                                               ; preds = %24
  %37 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %37, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %39

38:                                               ; preds = %24
  store i32 0, ptr %7, align 4
  br label %39

39:                                               ; preds = %38, %36
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  %40 = load i32, ptr %7, align 4
  switch i32 %40, label %45 [
    i32 0, label %41
  ]

41:                                               ; preds = %39
  br label %42

42:                                               ; preds = %41
  %43 = load i32, ptr %6, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %6, align 4, !tbaa !9
  br label %17, !llvm.loop !15

45:                                               ; preds = %39, %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %46 = load i32, ptr %7, align 4
  switch i32 %46, label %51 [
    i32 2, label %47
    i32 1, label %49
  ]

47:                                               ; preds = %45
  br label %48

48:                                               ; preds = %47
  store ptr null, ptr %3, align 8
  br label %49

49:                                               ; preds = %48, %45, %14
  %50 = load ptr, ptr %3, align 8
  ret ptr %50

51:                                               ; preds = %45
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"Node", !10, i64 0, !6, i64 8, !10, i64 16}
!13 = !{!12, !10, i64 16}
!14 = !{!12, !6, i64 8}
!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"

; Function Attrs: nofree nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local ptr @searchNode(ptr noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load i32, ptr %0, align 8, !tbaa !5
  %4 = icmp eq i32 %3, %1
  br i1 %4, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %2
  %5 = getelementptr inbounds i8, ptr %0, i64 16
  %6 = load i32, ptr %5, align 8, !tbaa !11
  %.not1819 = icmp sgt i32 %6, 0
  br i1 %.not1819, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %.preheader
  %7 = getelementptr inbounds i8, ptr %0, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !12
  %wide.trip.count = zext nneg i32 %6 to i64
  br label %10

9:                                                ; preds = %10
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %.loopexit, label %10, !llvm.loop !13

10:                                               ; preds = %.lr.ph, %9
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %9 ]
  %11 = getelementptr inbounds ptr, ptr %8, i64 %indvars.iv
  %12 = load ptr, ptr %11, align 8, !tbaa !15
  %13 = tail call ptr @searchNode(ptr noundef %12, i32 noundef %1)
  %.not = icmp eq ptr %13, null
  br i1 %.not, label %9, label %.loopexit

.loopexit:                                        ; preds = %9, %10, %.preheader, %2
  %.3 = phi ptr [ %0, %2 ], [ null, %.preheader ], [ null, %9 ], [ %13, %10 ]
  ret ptr %.3
}

attributes #0 = { nofree nosync nounwind memory(read, inaccessiblemem: none) 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, !7, i64 0}
!6 = !{!"Node", !7, i64 0, !10, i64 8, !7, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 16}
!12 = !{!6, !10, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!10, !10, i64 0}


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