; LLVM IR from kenjin/Awesome-LC-C-Cracker :: leetcode-c-sol/1614_maximum-nesting-depth-of-the-parentheses (maxDepth)

; 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
  %5 = 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
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %47, %1
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = load i32, ptr %5, align 4, !tbaa !9
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds i8, ptr %7, i64 %9
  %11 = load i8, ptr %10, align 1, !tbaa !11
  %12 = icmp ne i8 %11, 0
  br i1 %12, label %14, label %13

13:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %50

14:                                               ; preds = %6
  %15 = load ptr, ptr %2, align 8, !tbaa !5
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds i8, ptr %15, i64 %17
  %19 = load i8, ptr %18, align 1, !tbaa !11
  %20 = sext i8 %19 to i32
  %21 = icmp eq i32 %20, 40
  br i1 %21, label %22, label %34

22:                                               ; preds = %14
  %23 = load i32, ptr %4, align 4, !tbaa !9
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %4, align 4, !tbaa !9
  %25 = load i32, ptr %3, align 4, !tbaa !9
  %26 = load i32, ptr %4, align 4, !tbaa !9
  %27 = icmp sgt i32 %25, %26
  br i1 %27, label %28, label %30

28:                                               ; preds = %22
  %29 = load i32, ptr %3, align 4, !tbaa !9
  br label %32

30:                                               ; preds = %22
  %31 = load i32, ptr %4, align 4, !tbaa !9
  br label %32

32:                                               ; preds = %30, %28
  %33 = phi i32 [ %29, %28 ], [ %31, %30 ]
  store i32 %33, ptr %3, align 4, !tbaa !9
  br label %46

34:                                               ; preds = %14
  %35 = load ptr, ptr %2, align 8, !tbaa !5
  %36 = load i32, ptr %5, align 4, !tbaa !9
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds i8, ptr %35, i64 %37
  %39 = load i8, ptr %38, align 1, !tbaa !11
  %40 = sext i8 %39 to i32
  %41 = icmp eq i32 %40, 41
  br i1 %41, label %42, label %45

42:                                               ; preds = %34
  %43 = load i32, ptr %4, align 4, !tbaa !9
  %44 = add nsw i32 %43, -1
  store i32 %44, ptr %4, align 4, !tbaa !9
  br label %45

45:                                               ; preds = %42, %34
  br label %46

46:                                               ; preds = %45, %32
  br label %47

47:                                               ; preds = %46
  %48 = load i32, ptr %5, align 4, !tbaa !9
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %5, align 4, !tbaa !9
  br label %6, !llvm.loop !12

50:                                               ; preds = %13
  %51 = 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 %51
}

; 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(argmem: read) uwtable
define dso_local i32 @maxDepth(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %11, %1
  %indvars.iv = phi i64 [ %indvars.iv.next, %11 ], [ 0, %1 ]
  %.014 = phi i32 [ %.115, %11 ], [ 0, %1 ]
  %.013 = phi i32 [ %.1, %11 ], [ 0, %1 ]
  %3 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %4 = load i8, ptr %3, align 1, !tbaa !5
  switch i8 %4, label %11 [
    i8 0, label %5
    i8 40, label %6
    i8 41, label %9
  ]

5:                                                ; preds = %2
  ret i32 %.014

6:                                                ; preds = %2
  %7 = add nsw i32 %.013, 1
  %8 = tail call i32 @llvm.smax.i32(i32 %.014, i32 %7)
  br label %11

9:                                                ; preds = %2
  %10 = add nsw i32 %.013, -1
  br label %11

11:                                               ; preds = %2, %6, %9
  %.115 = phi i32 [ %8, %6 ], [ %.014, %9 ], [ %.014, %2 ]
  %.1 = phi i32 [ %7, %6 ], [ %10, %9 ], [ %.013, %2 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  br label %2, !llvm.loop !8
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #1

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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 speculatable willreturn memory(none) }

!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,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass