; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (1614)

; 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: nounwind uwtable
define dso_local i32 @maxDepth(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
  store i32 0, 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 %5

5:                                                ; preds = %32, %1
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = load i8, ptr %6, align 1, !tbaa !11
  %8 = icmp ne i8 %7, 0
  br i1 %8, label %9, label %35

9:                                                ; preds = %5
  %10 = load ptr, ptr %2, align 8, !tbaa !5
  %11 = load i8, ptr %10, align 1, !tbaa !11
  %12 = sext i8 %11 to i32
  %13 = icmp eq i32 %12, 40
  br i1 %13, label %14, label %23

14:                                               ; preds = %9
  %15 = load i32, ptr %4, align 4, !tbaa !9
  %16 = add nsw i32 %15, 1
  store i32 %16, ptr %4, align 4, !tbaa !9
  %17 = load i32, ptr %4, align 4, !tbaa !9
  %18 = load i32, ptr %3, align 4, !tbaa !9
  %19 = icmp sgt i32 %17, %18
  br i1 %19, label %20, label %22

20:                                               ; preds = %14
  %21 = load i32, ptr %4, align 4, !tbaa !9
  store i32 %21, ptr %3, align 4, !tbaa !9
  br label %22

22:                                               ; preds = %20, %14
  br label %32

23:                                               ; preds = %9
  %24 = load ptr, ptr %2, align 8, !tbaa !5
  %25 = load i8, ptr %24, align 1, !tbaa !11
  %26 = sext i8 %25 to i32
  %27 = icmp eq i32 %26, 41
  br i1 %27, label %28, label %31

28:                                               ; preds = %23
  %29 = load i32, ptr %4, align 4, !tbaa !9
  %30 = add nsw i32 %29, -1
  store i32 %30, ptr %4, align 4, !tbaa !9
  br label %31

31:                                               ; preds = %28, %23
  br label %32

32:                                               ; preds = %31, %22
  %33 = load ptr, ptr %2, align 8, !tbaa !5
  %34 = getelementptr inbounds i8, ptr %33, i32 1
  store ptr %34, ptr %2, align 8, !tbaa !5
  br label %5, !llvm.loop !12

35:                                               ; preds = %5
  %36 = load i32, ptr %3, 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 i32 %36
}

; 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

attributes #0 = { 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 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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 @maxDepth(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %8, %1
  %.011 = phi ptr [ %0, %1 ], [ %9, %8 ]
  %.09 = phi i32 [ 0, %1 ], [ %.110, %8 ]
  %.0 = phi i32 [ 0, %1 ], [ %.1, %8 ]
  %3 = load i8, ptr %.011, align 1, !tbaa !5
  switch i8 %3, label %8 [
    i8 0, label %10
    i8 40, label %4
    i8 41, label %6
  ]

4:                                                ; preds = %2
  %5 = add nsw i32 %.0, 1
  %.not16 = icmp slt i32 %.0, %.09
  %spec.select = select i1 %.not16, i32 %.09, i32 %5
  br label %8

6:                                                ; preds = %2
  %7 = add nsw i32 %.0, -1
  br label %8

8:                                                ; preds = %4, %2, %6
  %.110 = phi i32 [ %.09, %6 ], [ %spec.select, %4 ], [ %.09, %2 ]
  %.1 = phi i32 [ %7, %6 ], [ %5, %4 ], [ %.0, %2 ]
  %9 = getelementptr inbounds i8, ptr %.011, i64 1
  br label %2, !llvm.loop !8

10:                                               ; preds = %2
  ret i32 %.09
}

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" }

!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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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