; LLVM IR from KishanBGajera/2024-366-Days-Of-DSA :: Data Structures/Non-Linear/Tree/Tree Algorithms/Level Order Traversal/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, ptr }

; 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 i32 @level(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %9, ptr %7, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %37, %2
  %11 = load ptr, ptr %7, align 8, !tbaa !5
  %12 = icmp ne ptr %11, null
  br i1 %12, label %13, label %19

13:                                               ; preds = %10
  %14 = load ptr, ptr %7, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.Node, ptr %14, i32 0, i32 0
  %16 = load i32, ptr %15, align 8, !tbaa !11
  %17 = load i32, ptr %5, align 4, !tbaa !9
  %18 = icmp ne i32 %16, %17
  br label %19

19:                                               ; preds = %13, %10
  %20 = phi i1 [ false, %10 ], [ %18, %13 ]
  br i1 %20, label %21, label %38

21:                                               ; preds = %19
  %22 = load i32, ptr %6, align 4, !tbaa !9
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %6, align 4, !tbaa !9
  %24 = load ptr, ptr %7, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.Node, ptr %24, i32 0, i32 0
  %26 = load i32, ptr %25, align 8, !tbaa !11
  %27 = load i32, ptr %5, align 4, !tbaa !9
  %28 = icmp sgt i32 %26, %27
  br i1 %28, label %29, label %33

29:                                               ; preds = %21
  %30 = load ptr, ptr %7, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.Node, ptr %30, i32 0, i32 1
  %32 = load ptr, ptr %31, align 8, !tbaa !13
  store ptr %32, ptr %7, align 8, !tbaa !5
  br label %37

33:                                               ; preds = %21
  %34 = load ptr, ptr %7, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.Node, ptr %34, i32 0, i32 2
  %36 = load ptr, ptr %35, align 8, !tbaa !14
  store ptr %36, ptr %7, align 8, !tbaa !5
  br label %37

37:                                               ; preds = %33, %29
  br label %10, !llvm.loop !15

38:                                               ; preds = %19
  %39 = load ptr, ptr %7, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.Node, ptr %39, i32 0, i32 0
  %41 = load i32, ptr %40, align 8, !tbaa !11
  %42 = load i32, ptr %5, align 4, !tbaa !9
  %43 = icmp eq i32 %41, %42
  br i1 %43, label %44, label %46

44:                                               ; preds = %38
  %45 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %45, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %47

46:                                               ; preds = %38
  store i32 -1, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %47

47:                                               ; preds = %46, %44
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %48 = load i32, ptr %3, align 4
  ret i32 %48
}

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, !6, i64 16}
!13 = !{!12, !6, i64 8}
!14 = !{!12, !6, i64 16}
!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 norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local i32 @level(ptr noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not24 = icmp ne ptr %0, null
  tail call void @llvm.assume(i1 %.not24)
  %3 = load i32, ptr %0, align 8, !tbaa !5
  %.not1625 = icmp eq i32 %3, %1
  br i1 %.not1625, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %4 = phi i32 [ %7, %.lr.ph ], [ %3, %2 ]
  %.0121827 = phi i32 [ %5, %.lr.ph ], [ 0, %2 ]
  %.1.sink26 = phi ptr [ %.1, %.lr.ph ], [ %0, %2 ]
  %5 = add nuw nsw i32 %.0121827, 1
  %6 = icmp sgt i32 %4, %1
  %.1.in.v = select i1 %6, i64 8, i64 16
  %.1.in = getelementptr inbounds i8, ptr %.1.sink26, i64 %.1.in.v
  %.1 = load ptr, ptr %.1.in, align 8, !tbaa !11, !nonnull !12, !noundef !12
  %7 = load i32, ptr %.1, align 8, !tbaa !5
  %.not16 = icmp eq i32 %7, %1
  br i1 %.not16, label %.critedge, label %.lr.ph

.critedge:                                        ; preds = %.lr.ph, %2
  %.1.sink.lcssa = phi ptr [ %0, %2 ], [ %.1, %.lr.ph ]
  %.01218.lcssa = phi i32 [ 0, %2 ], [ %5, %.lr.ph ]
  %8 = load i32, ptr %.1.sink.lcssa, align 8, !tbaa !5
  %9 = icmp eq i32 %8, %1
  %.012. = select i1 %9, i32 %.01218.lcssa, i32 -1
  ret i32 %.012.
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write)
declare void @llvm.assume(i1 noundef) #1

attributes #0 = { nofree norecurse 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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) }

!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, !10, 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 = !{!10, !10, i64 0}
!12 = !{}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass