; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (669)

; 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 void @trimmer(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca ptr, align 8
  %11 = alloca ptr, align 8
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = icmp eq ptr %12, null
  br i1 %13, label %14, label %15

14:                                               ; preds = %4
  br label %59

15:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.TreeNode, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %17, align 8, !tbaa !11
  store i32 %18, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #2
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.TreeNode, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !13
  store ptr %21, ptr %10, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #2
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.TreeNode, ptr %22, i32 0, i32 2
  %24 = load ptr, ptr %23, align 8, !tbaa !14
  store ptr %24, ptr %11, align 8, !tbaa !5
  %25 = load i32, ptr %9, align 4, !tbaa !9
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = icmp slt i32 %25, %26
  br i1 %27, label %28, label %36

28:                                               ; preds = %15
  %29 = load ptr, ptr %11, align 8, !tbaa !5
  %30 = load ptr, ptr %6, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.TreeNode, ptr %30, i32 0, i32 1
  store ptr %29, ptr %31, align 8, !tbaa !13
  %32 = load ptr, ptr %11, align 8, !tbaa !5
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = load i32, ptr %8, align 4, !tbaa !9
  call void @trimmer(ptr noundef %32, ptr noundef %33, i32 noundef %34, i32 noundef %35)
  br label %58

36:                                               ; preds = %15
  %37 = load i32, ptr %9, align 4, !tbaa !9
  %38 = load i32, ptr %8, align 4, !tbaa !9
  %39 = icmp sgt i32 %37, %38
  br i1 %39, label %40, label %48

40:                                               ; preds = %36
  %41 = load ptr, ptr %10, align 8, !tbaa !5
  %42 = load ptr, ptr %6, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.TreeNode, ptr %42, i32 0, i32 2
  store ptr %41, ptr %43, align 8, !tbaa !14
  %44 = load ptr, ptr %10, align 8, !tbaa !5
  %45 = load ptr, ptr %6, align 8, !tbaa !5
  %46 = load i32, ptr %7, align 4, !tbaa !9
  %47 = load i32, ptr %8, align 4, !tbaa !9
  call void @trimmer(ptr noundef %44, ptr noundef %45, i32 noundef %46, i32 noundef %47)
  br label %57

48:                                               ; preds = %36
  %49 = load ptr, ptr %10, align 8, !tbaa !5
  %50 = load ptr, ptr %5, align 8, !tbaa !5
  %51 = load i32, ptr %7, align 4, !tbaa !9
  %52 = load i32, ptr %8, align 4, !tbaa !9
  call void @trimmer(ptr noundef %49, ptr noundef %50, i32 noundef %51, i32 noundef %52)
  %53 = load ptr, ptr %11, align 8, !tbaa !5
  %54 = load ptr, ptr %5, align 8, !tbaa !5
  %55 = load i32, ptr %7, align 4, !tbaa !9
  %56 = load i32, ptr %8, align 4, !tbaa !9
  call void @trimmer(ptr noundef %53, ptr noundef %54, i32 noundef %55, i32 noundef %56)
  br label %57

57:                                               ; preds = %48, %40
  br label %58

58:                                               ; preds = %57, %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %11) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %59

59:                                               ; preds = %58, %14
  ret void
}

; 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 = !{!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 nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @trimmer(ptr noundef %0, ptr nocapture noundef writeonly %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = icmp eq ptr %0, null
  br i1 %5, label %tailrecurse.outer._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %4, %tailrecurse.outer
  %.tr31.ph38 = phi ptr [ %.tr36, %tailrecurse.outer ], [ %1, %4 ]
  %.tr.ph37 = phi ptr [ %13, %tailrecurse.outer ], [ %0, %4 ]
  %6 = getelementptr inbounds i8, ptr %.tr31.ph38, i64 16
  %7 = getelementptr inbounds i8, ptr %.tr31.ph38, i64 8
  br label %8

8:                                                ; preds = %.lr.ph, %tailrecurse.backedge
  %.tr36 = phi ptr [ %.tr.ph37, %.lr.ph ], [ %.tr.be, %tailrecurse.backedge ]
  %9 = load i32, ptr %.tr36, align 8, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %.tr36, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = getelementptr inbounds i8, ptr %.tr36, i64 16
  %13 = load ptr, ptr %12, align 8, !tbaa !12
  %14 = icmp slt i32 %9, %2
  br i1 %14, label %15, label %17

15:                                               ; preds = %8
  store ptr %13, ptr %7, align 8, !tbaa !11
  br label %tailrecurse.backedge

tailrecurse.backedge:                             ; preds = %15, %19
  %.tr.be = phi ptr [ %13, %15 ], [ %11, %19 ]
  %16 = icmp eq ptr %.tr.be, null
  br i1 %16, label %tailrecurse.outer._crit_edge, label %8

17:                                               ; preds = %8
  %18 = icmp sgt i32 %9, %3
  br i1 %18, label %19, label %tailrecurse.outer

19:                                               ; preds = %17
  store ptr %11, ptr %6, align 8, !tbaa !12
  br label %tailrecurse.backedge

tailrecurse.outer:                                ; preds = %17
  tail call void @trimmer(ptr noundef %11, ptr noundef nonnull %.tr36, i32 noundef %2, i32 noundef %3)
  %20 = icmp eq ptr %13, null
  br i1 %20, label %tailrecurse.outer._crit_edge, label %.lr.ph

tailrecurse.outer._crit_edge:                     ; preds = %tailrecurse.outer, %tailrecurse.backedge, %4
  ret void
}

attributes #0 = { nofree nosync nounwind memory(readwrite, 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, !7, i64 0}
!6 = !{!"TreeNode", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = !{!6, !10, i64 16}


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