; LLVM IR from JessonYue/LeetCodeLearning :: Array/linchuanxin/Algorithm/day32_0702_109有序链表转换二叉搜索树 (day32_leetcode109)

; 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.ListNode = type { i32, ptr }

; Function Attrs: nounwind uwtable
define dso_local ptr @findMidNode(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store ptr null, ptr %2, align 8
  br label %41

10:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store ptr null, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %11, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %12, ptr %6, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %23, %10
  %14 = load ptr, ptr %6, align 8, !tbaa !5
  %15 = icmp ne ptr %14, null
  br i1 %15, label %16, label %21

16:                                               ; preds = %13
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.ListNode, ptr %17, i32 0, i32 1
  %19 = load ptr, ptr %18, align 8, !tbaa !9
  %20 = icmp ne ptr %19, null
  br label %21

21:                                               ; preds = %16, %13
  %22 = phi i1 [ false, %13 ], [ %20, %16 ]
  br i1 %22, label %23, label %33

23:                                               ; preds = %21
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %24, ptr %4, align 8, !tbaa !5
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.ListNode, ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !9
  store ptr %27, ptr %5, align 8, !tbaa !5
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.ListNode, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !9
  %31 = getelementptr inbounds %struct.ListNode, ptr %30, i32 0, i32 1
  %32 = load ptr, ptr %31, align 8, !tbaa !9
  store ptr %32, ptr %6, align 8, !tbaa !5
  br label %13, !llvm.loop !12

33:                                               ; preds = %21
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = icmp ne ptr %34, null
  br i1 %35, label %36, label %39

36:                                               ; preds = %33
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.ListNode, ptr %37, i32 0, i32 1
  store ptr null, ptr %38, align 8, !tbaa !9
  br label %39

39:                                               ; preds = %36, %33
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %40, ptr %2, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %41

41:                                               ; preds = %39, %9
  %42 = load ptr, ptr %2, align 8
  ret ptr %42
}

; 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, !6, i64 8}
!10 = !{!"ListNode", !11, i64 0, !6, i64 8}
!11 = !{!"int", !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(readwrite, inaccessiblemem: none) uwtable
define dso_local ptr @findMidNode(ptr noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq ptr %0, null
  br i1 %2, label %13, label %.preheader.preheader

.preheader.preheader:                             ; preds = %1
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %.not1731 = icmp eq ptr %4, null
  br i1 %.not1731, label %.critedge, label %.lr.ph

.preheader:                                       ; preds = %.lr.ph
  %5 = getelementptr inbounds i8, ptr %11, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !5
  %.not17 = icmp eq ptr %6, null
  br i1 %.not17, label %.critedge, label %.lr.ph, !llvm.loop !11

.lr.ph:                                           ; preds = %.preheader.preheader, %.preheader
  %7 = phi ptr [ %6, %.preheader ], [ %4, %.preheader.preheader ]
  %.0122032 = phi ptr [ %9, %.preheader ], [ %0, %.preheader.preheader ]
  %8 = getelementptr inbounds i8, ptr %.0122032, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %7, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  %.not = icmp eq ptr %11, null
  br i1 %.not, label %.critedge.thread, label %.preheader, !llvm.loop !11

.critedge:                                        ; preds = %.preheader, %.preheader.preheader
  %.01220.lcssa = phi ptr [ %0, %.preheader.preheader ], [ %9, %.preheader ]
  %.01319.lcssa = phi ptr [ null, %.preheader.preheader ], [ %.0122032, %.preheader ]
  %.not18 = icmp eq ptr %.01319.lcssa, null
  br i1 %.not18, label %13, label %.critedge.thread

.critedge.thread:                                 ; preds = %.lr.ph, %.critedge
  %.012.lcssa26 = phi ptr [ %.01220.lcssa, %.critedge ], [ %9, %.lr.ph ]
  %.013.lcssa25 = phi ptr [ %.01319.lcssa, %.critedge ], [ %.0122032, %.lr.ph ]
  %12 = getelementptr inbounds i8, ptr %.013.lcssa25, i64 8
  store ptr null, ptr %12, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %.critedge, %.critedge.thread, %1
  %.014 = phi ptr [ null, %1 ], [ %.012.lcssa26, %.critedge.thread ], [ %.01220.lcssa, %.critedge ]
  ret ptr %.014
}

attributes #0 = { nofree norecurse 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, !10, i64 8}
!6 = !{!"ListNode", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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