; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (1008)

; 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: nounwind uwtable
define dso_local ptr @build(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca ptr, align 8
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = icmp eq i32 %11, %12
  br i1 %13, label %14, label %15

14:                                               ; preds = %3
  store ptr null, ptr %4, align 8
  br label %59

15:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = load i32, ptr %6, align 4, !tbaa !9
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds i32, ptr %16, i64 %18
  %20 = load i32, ptr %19, align 4, !tbaa !9
  store i32 %20, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %9, align 4, !tbaa !9
  br label %23

23:                                               ; preds = %37, %15
  %24 = load i32, ptr %9, align 4, !tbaa !9
  %25 = load i32, ptr %7, align 4, !tbaa !9
  %26 = icmp slt i32 %24, %25
  br i1 %26, label %27, label %35

27:                                               ; preds = %23
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = load i32, ptr %9, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !9
  %33 = load i32, ptr %8, align 4, !tbaa !9
  %34 = icmp slt i32 %32, %33
  br label %35

35:                                               ; preds = %27, %23
  %36 = phi i1 [ false, %23 ], [ %34, %27 ]
  br i1 %36, label %37, label %40

37:                                               ; preds = %35
  %38 = load i32, ptr %9, align 4, !tbaa !9
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %9, align 4, !tbaa !9
  br label %23, !llvm.loop !11

40:                                               ; preds = %35
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #3
  %41 = call noalias ptr @malloc(i64 noundef 24) #4
  store ptr %41, ptr %10, align 8, !tbaa !5
  %42 = load i32, ptr %8, align 4, !tbaa !9
  %43 = load ptr, ptr %10, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.TreeNode, ptr %43, i32 0, i32 0
  store i32 %42, ptr %44, align 8, !tbaa !13
  %45 = load ptr, ptr %5, align 8, !tbaa !5
  %46 = load i32, ptr %6, align 4, !tbaa !9
  %47 = add nsw i32 %46, 1
  %48 = load i32, ptr %9, align 4, !tbaa !9
  %49 = call ptr @build(ptr noundef %45, i32 noundef %47, i32 noundef %48)
  %50 = load ptr, ptr %10, align 8, !tbaa !5
  %51 = getelementptr inbounds %struct.TreeNode, ptr %50, i32 0, i32 1
  store ptr %49, ptr %51, align 8, !tbaa !15
  %52 = load ptr, ptr %5, align 8, !tbaa !5
  %53 = load i32, ptr %9, align 4, !tbaa !9
  %54 = load i32, ptr %7, align 4, !tbaa !9
  %55 = call ptr @build(ptr noundef %52, i32 noundef %53, i32 noundef %54)
  %56 = load ptr, ptr %10, align 8, !tbaa !5
  %57 = getelementptr inbounds %struct.TreeNode, ptr %56, i32 0, i32 2
  store ptr %55, ptr %57, align 8, !tbaa !16
  %58 = load ptr, ptr %10, align 8, !tbaa !5
  store ptr %58, ptr %4, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  br label %59

59:                                               ; preds = %40, %14
  %60 = load ptr, ptr %4, align 8
  ret ptr %60
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; 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 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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!14, !10, i64 0}
!14 = !{!"TreeNode", !10, i64 0, !6, i64 8, !6, i64 16}
!15 = !{!14, !6, i64 8}
!16 = !{!14, !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 @build(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i32 %1, %2
  br i1 %4, label %common.ret34, label %5

5:                                                ; preds = %3
  %6 = sext i32 %1 to i64
  %7 = getelementptr inbounds i32, ptr %0, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = add nsw i32 %1, 1
  %10 = icmp slt i32 %9, %2
  br i1 %10, label %.lr.ph.preheader, label %.critedge

.lr.ph.preheader:                                 ; preds = %5
  %11 = sext i32 %9 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %15
  %indvars.iv = phi i64 [ %11, %.lr.ph.preheader ], [ %indvars.iv.next, %15 ]
  %12 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = icmp slt i32 %13, %8
  br i1 %14, label %15, label %.critedge.loopexit.split.loop.exit29

15:                                               ; preds = %.lr.ph
  %indvars.iv.next = add nsw i64 %indvars.iv, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond.not = icmp eq i32 %lftr.wideiv, %2
  br i1 %exitcond.not, label %.critedge, label %.lr.ph, !llvm.loop !9

common.ret34:                                     ; preds = %3, %.critedge
  %common.ret34.op = phi ptr [ %17, %.critedge ], [ null, %3 ]
  ret ptr %common.ret34.op

.critedge.loopexit.split.loop.exit29:             ; preds = %.lr.ph
  %16 = trunc nsw i64 %indvars.iv to i32
  br label %.critedge

.critedge:                                        ; preds = %15, %.critedge.loopexit.split.loop.exit29, %5
  %.022.lcssa = phi i32 [ %9, %5 ], [ %16, %.critedge.loopexit.split.loop.exit29 ], [ %2, %15 ]
  %17 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #2
  store i32 %8, ptr %17, align 8, !tbaa !11
  %18 = tail call ptr @build(ptr noundef nonnull %0, i32 noundef %9, i32 noundef %.022.lcssa)
  %19 = getelementptr inbounds i8, ptr %17, i64 8
  store ptr %18, ptr %19, align 8, !tbaa !14
  %20 = tail call ptr @build(ptr noundef nonnull %0, i32 noundef %.022.lcssa, i32 noundef %2)
  %21 = getelementptr inbounds i8, ptr %17, i64 16
  store ptr %20, ptr %21, align 8, !tbaa !15
  br label %common.ret34
}

; 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

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 = { 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !6, i64 0}
!12 = !{!"TreeNode", !6, i64 0, !13, i64 8, !13, i64 16}
!13 = !{!"any pointer", !7, i64 0}
!14 = !{!12, !13, i64 8}
!15 = !{!12, !13, i64 16}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass