; LLVM IR from Leet-Us-Code/DSA-A-Z-Practice :: Sid's Levels/Level - 1/BinaryTree/ZigZagTreeTraversal.ll (Z11printZigZagP4Node)

; 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"

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z14levelOrderLtoRP4Nodei(ptr noundef, i32 noundef) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z14levelOrderRtoLP4Nodei(ptr noundef, i32 noundef) #0

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z9getHeightP4Node(ptr 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: mustprogress uwtable
define dso_local void @_Z11printZigZagP4Node(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = call noundef i32 @_Z9getHeightP4Node(ptr noundef %5)
  store i32 %6, ptr %3, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %7

7:                                                ; preds = %23, %1
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = load i32, ptr %3, align 4, !tbaa !9
  %10 = icmp sle i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %26

12:                                               ; preds = %7
  %13 = load i32, ptr %4, align 4, !tbaa !9
  %14 = srem i32 %13, 2
  %15 = icmp eq i32 %14, 0
  br i1 %15, label %16, label %19

16:                                               ; preds = %12
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !9
  call void @_Z14levelOrderLtoRP4Nodei(ptr noundef %17, i32 noundef %18)
  br label %22

19:                                               ; preds = %12
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = load i32, ptr %4, align 4, !tbaa !9
  call void @_Z14levelOrderRtoLP4Nodei(ptr noundef %20, i32 noundef %21)
  br label %22

22:                                               ; preds = %19, %16
  br label %23

23:                                               ; preds = %22
  %24 = load i32, ptr %4, align 4, !tbaa !9
  %25 = add nsw i32 %24, 1
  store i32 %25, ptr %4, align 4, !tbaa !9
  br label %7, !llvm.loop !11

26:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret void
}

attributes #0 = { 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 #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 = !{!"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 = distinct !{!11, !12}
!12 = !{!"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: mustprogress uwtable
declare dso_local void @_Z14levelOrderLtoRP4Nodei(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z14levelOrderRtoLP4Nodei(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z9getHeightP4Node(ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z11printZigZagP4Node(ptr noundef %0) local_unnamed_addr #0 {
  %2 = tail call noundef i32 @_Z9getHeightP4Node(ptr noundef %0)
  %.not8 = icmp slt i32 %2, 0
  br i1 %.not8, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %7, %1
  ret void

.lr.ph:                                           ; preds = %1, %7
  %.09 = phi i32 [ %8, %7 ], [ 0, %1 ]
  %3 = and i32 %.09, 1
  %4 = icmp eq i32 %3, 0
  br i1 %4, label %5, label %6

5:                                                ; preds = %.lr.ph
  tail call void @_Z14levelOrderLtoRP4Nodei(ptr noundef %0, i32 noundef %.09)
  br label %7

6:                                                ; preds = %.lr.ph
  tail call void @_Z14levelOrderRtoLP4Nodei(ptr noundef %0, i32 noundef %.09)
  br label %7

7:                                                ; preds = %5, %6
  %8 = add nuw i32 %.09, 1
  %exitcond.not = icmp eq i32 %.09, %2
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5
}

attributes #0 = { 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" }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass