; LLVM IR from JessonYue/LeetCodeLearning :: Array/cuijilin/LinkedList (main)

; 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.LinkedList = type { ptr, i32 }
%struct.Node = type { i32, ptr }

@.str.1 = external hidden unnamed_addr constant [93 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [11 x i8], align 1
@__PRETTY_FUNCTION__.getMidNode = external hidden unnamed_addr constant [31 x i8], align 1
@.str.9 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.10 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.11 = external hidden unnamed_addr constant [19 x i8], align 1

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

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

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) #1

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: nounwind uwtable
define dso_local ptr @getMidNode(ptr noundef %0) #3 {
  %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
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = icmp ne ptr %8, null
  br i1 %9, label %10, label %11

10:                                               ; preds = %1
  br label %12

11:                                               ; preds = %1
  call void @__assert_fail(ptr noundef @.str.3, ptr noundef @.str.1, i32 noundef 186, ptr noundef @__PRETTY_FUNCTION__.getMidNode) #4
  unreachable

12:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #5
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.LinkedList, ptr %13, i32 0, i32 0
  %15 = load ptr, ptr %14, align 8, !tbaa !9
  store ptr %15, ptr %4, align 8, !tbaa !5
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %19

18:                                               ; preds = %12
  br label %20

19:                                               ; preds = %12
  call void @__assert_fail(ptr noundef @.str.9, ptr noundef @.str.1, i32 noundef 188, ptr noundef @__PRETTY_FUNCTION__.getMidNode) #4
  unreachable

20:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %21, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #5
  store ptr null, ptr %6, align 8, !tbaa !5
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = icmp ne ptr %22, null
  br i1 %23, label %24, label %25

24:                                               ; preds = %20
  br label %26

25:                                               ; preds = %20
  call void @__assert_fail(ptr noundef @.str.10, ptr noundef @.str.1, i32 noundef 191, ptr noundef @__PRETTY_FUNCTION__.getMidNode) #4
  unreachable

26:                                               ; preds = %24
  br label %27

27:                                               ; preds = %44, %26
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.Node, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !12
  %31 = icmp eq ptr null, %30
  br i1 %31, label %32, label %34

32:                                               ; preds = %27
  %33 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %33, ptr %6, align 8, !tbaa !5
  br label %53

34:                                               ; preds = %27
  %35 = load ptr, ptr %5, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.Node, ptr %35, i32 0, i32 1
  %37 = load ptr, ptr %36, align 8, !tbaa !12
  %38 = getelementptr inbounds %struct.Node, ptr %37, i32 0, i32 1
  %39 = load ptr, ptr %38, align 8, !tbaa !12
  %40 = icmp eq ptr null, %39
  br i1 %40, label %41, label %43

41:                                               ; preds = %34
  %42 = call i32 (ptr, ...) @printf(ptr noundef @.str.11)
  store ptr null, ptr %2, align 8
  store i32 1, ptr %7, align 4
  br label %55

43:                                               ; preds = %34
  br label %44

44:                                               ; preds = %43
  %45 = load ptr, ptr %5, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.Node, ptr %45, i32 0, i32 1
  %47 = load ptr, ptr %46, align 8, !tbaa !12
  %48 = getelementptr inbounds %struct.Node, ptr %47, i32 0, i32 1
  %49 = load ptr, ptr %48, align 8, !tbaa !12
  store ptr %49, ptr %5, align 8, !tbaa !5
  %50 = load ptr, ptr %4, align 8, !tbaa !5
  %51 = getelementptr inbounds %struct.Node, ptr %50, i32 0, i32 1
  %52 = load ptr, ptr %51, align 8, !tbaa !12
  store ptr %52, ptr %4, align 8, !tbaa !5
  br label %27

53:                                               ; preds = %32
  %54 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %54, ptr %2, align 8
  store i32 1, ptr %7, align 4
  br label %55

55:                                               ; preds = %53, %41
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #5
  %56 = load ptr, ptr %2, align 8
  ret ptr %56
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { noreturn nounwind "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 = { "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 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 #4 = { noreturn nounwind }
attributes #5 = { 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 0}
!10 = !{!"LinkedList", !6, i64 0, !11, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!13, !6, i64 8}
!13 = !{!"Node", !11, i64 0, !6, i64 8}


; 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"

@.str.1 = external hidden unnamed_addr constant [93 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [11 x i8], align 1
@__PRETTY_FUNCTION__.getMidNode = external hidden unnamed_addr constant [31 x i8], align 1
@.str.9 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.11 = external hidden unnamed_addr constant [19 x i8], align 1

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local ptr @getMidNode(ptr noundef readonly %0) local_unnamed_addr #2 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %2, label %3

2:                                                ; preds = %1
  tail call void @__assert_fail(ptr noundef nonnull @.str.3, ptr noundef nonnull @.str.1, i32 noundef 186, ptr noundef nonnull @__PRETTY_FUNCTION__.getMidNode) #3
  unreachable

3:                                                ; preds = %1
  %4 = load ptr, ptr %0, align 8, !tbaa !5
  %.not18 = icmp eq ptr %4, null
  br i1 %.not18, label %8, label %.preheader

.preheader:                                       ; preds = %3
  %5 = getelementptr inbounds i8, ptr %4, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !11
  %7 = icmp eq ptr %6, null
  br i1 %7, label %.loopexit, label %.lr.ph

8:                                                ; preds = %3
  tail call void @__assert_fail(ptr noundef nonnull @.str.9, ptr noundef nonnull @.str.1, i32 noundef 188, ptr noundef nonnull @__PRETTY_FUNCTION__.getMidNode) #3
  unreachable

.lr.ph:                                           ; preds = %.preheader, %15
  %9 = phi ptr [ %19, %15 ], [ %6, %.preheader ]
  %.01220 = phi ptr [ %17, %15 ], [ %4, %.preheader ]
  %10 = getelementptr inbounds i8, ptr %9, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = icmp eq ptr %11, null
  br i1 %12, label %13, label %15

13:                                               ; preds = %.lr.ph
  %14 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.11)
  br label %.loopexit

15:                                               ; preds = %.lr.ph
  %16 = getelementptr inbounds i8, ptr %.01220, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !11
  %18 = getelementptr inbounds i8, ptr %11, i64 8
  %19 = load ptr, ptr %18, align 8, !tbaa !11
  %20 = icmp eq ptr %19, null
  br i1 %20, label %.loopexit, label %.lr.ph

.loopexit:                                        ; preds = %15, %.preheader, %13
  %.013 = phi ptr [ null, %13 ], [ %4, %.preheader ], [ %17, %15 ]
  ret ptr %.013
}

attributes #0 = { noreturn nounwind "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 = { nofree nounwind "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 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 #3 = { noreturn 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, !7, i64 0}
!6 = !{!"LinkedList", !7, i64 0, !10, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!12, !7, i64 8}
!12 = !{!"Node", !10, i64 0, !7, i64 8}


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