; LLVM IR from kaynewbie/algorithm :: algorithm/LeetCode/Easy (convert-sorted-array-to-binary-search-tree)

; 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.TreeNode = 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: nounwind uwtable
define dso_local ptr @sortedArrayToBSTCore(ptr noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = add nsw i32 %9, %10
  %12 = ashr i32 %11, 1
  store i32 %12, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %13 = call noalias ptr @malloc(i64 noundef 24) #4
  store ptr %13, ptr %8, align 8, !tbaa !5
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = load i32, ptr %7, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i32, ptr %14, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = load ptr, ptr %8, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.TreeNode, ptr %19, i32 0, i32 0
  store i32 %18, ptr %20, align 8, !tbaa !11
  %21 = load ptr, ptr %8, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.TreeNode, ptr %21, i32 0, i32 1
  store ptr null, ptr %22, align 8, !tbaa !13
  %23 = load ptr, ptr %8, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.TreeNode, ptr %23, i32 0, i32 2
  store ptr null, ptr %24, align 8, !tbaa !14
  %25 = load i32, ptr %5, align 4, !tbaa !9
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = icmp ne i32 %25, %26
  br i1 %27, label %28, label %36

28:                                               ; preds = %3
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = load i32, ptr %5, align 4, !tbaa !9
  %31 = load i32, ptr %7, align 4, !tbaa !9
  %32 = sub nsw i32 %31, 1
  %33 = call ptr @sortedArrayToBSTCore(ptr noundef %29, i32 noundef %30, i32 noundef %32)
  %34 = load ptr, ptr %8, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.TreeNode, ptr %34, i32 0, i32 1
  store ptr %33, ptr %35, align 8, !tbaa !13
  br label %36

36:                                               ; preds = %28, %3
  %37 = load i32, ptr %6, align 4, !tbaa !9
  %38 = load i32, ptr %7, align 4, !tbaa !9
  %39 = icmp ne i32 %37, %38
  br i1 %39, label %40, label %48

40:                                               ; preds = %36
  %41 = load ptr, ptr %4, align 8, !tbaa !5
  %42 = load i32, ptr %7, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  %44 = load i32, ptr %6, align 4, !tbaa !9
  %45 = call ptr @sortedArrayToBSTCore(ptr noundef %41, i32 noundef %43, i32 noundef %44)
  %46 = load ptr, ptr %8, align 8, !tbaa !5
  %47 = getelementptr inbounds %struct.TreeNode, ptr %46, i32 0, i32 2
  store ptr %45, ptr %47, align 8, !tbaa !14
  br label %48

48:                                               ; preds = %40, %36
  %49 = load ptr, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  ret ptr %49
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 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 = { nounwind allocsize(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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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 = !{!"TreeNode", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 8}
!14 = !{!12, !6, i64 16}


; 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 nounwind memory(write, argmem: read, inaccessiblemem: readwrite) uwtable
define dso_local noalias noundef ptr @sortedArrayToBSTCore(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = add nsw i32 %2, %1
  %5 = ashr i32 %4, 1
  %6 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #3
  %7 = sext i32 %5 to i64
  %8 = getelementptr inbounds i32, ptr %0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  store i32 %9, ptr %6, align 8, !tbaa !9
  %10 = getelementptr inbounds i8, ptr %6, i64 8
  %11 = getelementptr inbounds i8, ptr %6, i64 16
  %.not = icmp eq i32 %5, %1
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %10, i8 0, i64 16, i1 false)
  br i1 %.not, label %15, label %12

12:                                               ; preds = %3
  %13 = add nsw i32 %5, -1
  %14 = tail call ptr @sortedArrayToBSTCore(ptr noundef nonnull %0, i32 noundef %1, i32 noundef %13)
  store ptr %14, ptr %10, align 8, !tbaa !12
  br label %15

15:                                               ; preds = %12, %3
  %.not21 = icmp eq i32 %5, %2
  br i1 %.not21, label %common.ret22, label %16

common.ret22:                                     ; preds = %15, %16
  ret ptr %6

16:                                               ; preds = %15
  %17 = add nsw i32 %5, 1
  %18 = tail call ptr @sortedArrayToBSTCore(ptr noundef nonnull %0, i32 noundef %17, i32 noundef %2)
  store ptr %18, ptr %11, align 8, !tbaa !13
  br label %common.ret22
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

attributes #0 = { nofree nounwind memory(write, argmem: read, inaccessiblemem: readwrite) 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 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #3 = { nounwind allocsize(0) }

!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, !6, i64 0}
!10 = !{!"TreeNode", !6, i64 0, !11, i64 8, !11, i64 16}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!10, !11, i64 8}
!13 = !{!10, !11, i64 16}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,MemCpyOptPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass