; LLVM IR from div-bargali/Data-Structures-and-Algorithms :: C/Algorithms/Graph-Algorithms (tree_traversal)

; 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 }

@root = external dso_local global ptr, align 8
@.str = external hidden unnamed_addr constant [20 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

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

8:                                                ; preds = %40, %1
  %9 = load ptr, ptr %4, align 8, !tbaa !9
  %10 = getelementptr inbounds %struct.node, ptr %9, i32 0, i32 0
  %11 = load i32, ptr %10, align 8, !tbaa !11
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = icmp ne i32 %11, %12
  br i1 %13, label %14, label %41

14:                                               ; preds = %8
  %15 = load ptr, ptr %4, align 8, !tbaa !9
  %16 = icmp ne ptr %15, null
  br i1 %16, label %17, label %22

17:                                               ; preds = %14
  %18 = load ptr, ptr %4, align 8, !tbaa !9
  %19 = getelementptr inbounds %struct.node, ptr %18, i32 0, i32 0
  %20 = load i32, ptr %19, align 8, !tbaa !11
  %21 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %20)
  br label %22

22:                                               ; preds = %17, %14
  %23 = load ptr, ptr %4, align 8, !tbaa !9
  %24 = getelementptr inbounds %struct.node, ptr %23, i32 0, i32 0
  %25 = load i32, ptr %24, align 8, !tbaa !11
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = icmp sgt i32 %25, %26
  br i1 %27, label %28, label %32

28:                                               ; preds = %22
  %29 = load ptr, ptr %4, align 8, !tbaa !9
  %30 = getelementptr inbounds %struct.node, ptr %29, i32 0, i32 1
  %31 = load ptr, ptr %30, align 8, !tbaa !13
  store ptr %31, ptr %4, align 8, !tbaa !9
  br label %36

32:                                               ; preds = %22
  %33 = load ptr, ptr %4, align 8, !tbaa !9
  %34 = getelementptr inbounds %struct.node, ptr %33, i32 0, i32 2
  %35 = load ptr, ptr %34, align 8, !tbaa !14
  store ptr %35, ptr %4, align 8, !tbaa !9
  br label %36

36:                                               ; preds = %32, %28
  %37 = load ptr, ptr %4, align 8, !tbaa !9
  %38 = icmp eq ptr %37, null
  br i1 %38, label %39, label %40

39:                                               ; preds = %36
  store ptr null, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %43

40:                                               ; preds = %36
  br label %8, !llvm.loop !15

41:                                               ; preds = %8
  %42 = load ptr, ptr %4, align 8, !tbaa !9
  store ptr %42, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %43

43:                                               ; preds = %41, %39
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %44 = load ptr, ptr %2, align 8
  ret ptr %44
}

declare i32 @printf(ptr noundef, ...) #2

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 = { "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 #3 = { 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, !6, i64 0}
!12 = !{!"node", !6, i64 0, !10, i64 8, !10, i64 16}
!13 = !{!12, !10, i64 8}
!14 = !{!12, !10, 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"

@root = external dso_local local_unnamed_addr global ptr, align 8
@.str = external hidden unnamed_addr constant [20 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local noundef ptr @search(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr @root, align 8, !tbaa !5
  %3 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  br label %4

4:                                                ; preds = %6, %1
  %.0 = phi ptr [ %2, %1 ], [ %.1, %6 ]
  %5 = load i32, ptr %.0, align 8, !tbaa !9
  %.not = icmp eq i32 %5, %0
  br i1 %.not, label %11, label %6

6:                                                ; preds = %4
  %7 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %5)
  %8 = load i32, ptr %.0, align 8, !tbaa !9
  %9 = icmp sgt i32 %8, %0
  %.1.in.v = select i1 %9, i64 8, i64 16
  %.1.in = getelementptr inbounds i8, ptr %.0, i64 %.1.in.v
  %.1 = load ptr, ptr %.1.in, align 8, !tbaa !5
  %10 = icmp eq ptr %.1, null
  br i1 %10, label %11, label %4, !llvm.loop !12

11:                                               ; preds = %4, %6
  %.010 = phi ptr [ null, %6 ], [ %.0, %4 ]
  ret ptr %.010
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

attributes #0 = { nofree 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 = { nofree nounwind "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, !11, i64 0}
!10 = !{!"node", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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