; LLVM IR from JessonYue/LeetCodeLearning :: Array/zhanchengguo/0612-奇偶链表/main.ll (Z12oddEvenList1P8ListNode)

; 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: 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: mustprogress nounwind uwtable
define dso_local noundef ptr @_Z12oddEvenList1P8ListNode(ptr noundef %0) #1 {
  %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 ne ptr %7, null
  br i1 %8, label %9, label %21

9:                                                ; preds = %1
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.ListNode, ptr %10, i32 0, i32 1
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = icmp ne ptr %12, null
  br i1 %13, label %14, label %21

14:                                               ; preds = %9
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.ListNode, ptr %15, i32 0, i32 1
  %17 = load ptr, ptr %16, align 8, !tbaa !9
  %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 i1 %20, label %23, label %21

21:                                               ; preds = %14, %9, %1
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %22, ptr %2, align 8
  br label %67

23:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %24, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %25 = load ptr, ptr %3, 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
  br label %28

28:                                               ; preds = %38, %23
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = icmp ne ptr %29, null
  br i1 %30, label %31, label %36

31:                                               ; preds = %28
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.ListNode, ptr %32, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !9
  %35 = icmp ne ptr %34, null
  br label %36

36:                                               ; preds = %31, %28
  %37 = phi i1 [ false, %28 ], [ %35, %31 ]
  br i1 %37, label %38, label %65

38:                                               ; preds = %36
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %39 = load ptr, ptr %4, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.ListNode, ptr %39, i32 0, i32 1
  %41 = load ptr, ptr %40, align 8, !tbaa !9
  store ptr %41, ptr %6, align 8, !tbaa !5
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.ListNode, ptr %42, i32 0, i32 1
  %44 = load ptr, ptr %43, align 8, !tbaa !9
  %45 = load ptr, ptr %4, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.ListNode, ptr %45, i32 0, i32 1
  store ptr %44, ptr %46, align 8, !tbaa !9
  %47 = load ptr, ptr %5, align 8, !tbaa !5
  %48 = getelementptr inbounds %struct.ListNode, ptr %47, i32 0, i32 1
  %49 = load ptr, ptr %48, align 8, !tbaa !9
  %50 = getelementptr inbounds %struct.ListNode, ptr %49, i32 0, i32 1
  %51 = load ptr, ptr %50, align 8, !tbaa !9
  %52 = load ptr, ptr %5, align 8, !tbaa !5
  %53 = getelementptr inbounds %struct.ListNode, ptr %52, i32 0, i32 1
  store ptr %51, ptr %53, align 8, !tbaa !9
  %54 = load ptr, ptr %6, align 8, !tbaa !5
  %55 = load ptr, ptr %4, align 8, !tbaa !5
  %56 = getelementptr inbounds %struct.ListNode, ptr %55, i32 0, i32 1
  %57 = load ptr, ptr %56, align 8, !tbaa !9
  %58 = getelementptr inbounds %struct.ListNode, ptr %57, i32 0, i32 1
  store ptr %54, ptr %58, align 8, !tbaa !9
  %59 = load ptr, ptr %4, align 8, !tbaa !5
  %60 = getelementptr inbounds %struct.ListNode, ptr %59, i32 0, i32 1
  %61 = load ptr, ptr %60, align 8, !tbaa !9
  store ptr %61, ptr %4, align 8, !tbaa !5
  %62 = load ptr, ptr %5, align 8, !tbaa !5
  %63 = getelementptr inbounds %struct.ListNode, ptr %62, i32 0, i32 1
  %64 = load ptr, ptr %63, align 8, !tbaa !9
  store ptr %64, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %28, !llvm.loop !12

65:                                               ; preds = %36
  %66 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %66, ptr %2, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %67

67:                                               ; preds = %65, %21
  %68 = load ptr, ptr %2, align 8
  ret ptr %68
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 }

!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++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"_ZTS8ListNode", !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: mustprogress nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef ptr @_Z12oddEvenList1P8ListNode(ptr noundef returned %0) local_unnamed_addr #0 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %.critedge, label %2

2:                                                ; preds = %1
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %.not23 = icmp eq ptr %4, null
  br i1 %.not23, label %.critedge, label %5

5:                                                ; preds = %2
  %6 = getelementptr inbounds i8, ptr %4, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %.not24 = icmp eq ptr %7, null
  br i1 %.not24, label %.critedge, label %.preheader

.preheader:                                       ; preds = %5, %10
  %.01928 = phi ptr [ %19, %10 ], [ %4, %5 ]
  %.02027 = phi ptr [ %18, %10 ], [ %0, %5 ]
  %8 = getelementptr inbounds i8, ptr %.01928, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %.not26 = icmp eq ptr %9, null
  br i1 %.not26, label %.critedge, label %10

10:                                               ; preds = %.preheader
  %11 = getelementptr inbounds i8, ptr %.02027, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !5
  store ptr %9, ptr %11, align 8, !tbaa !5
  %13 = load ptr, ptr %8, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %13, i64 8
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  store ptr %15, ptr %8, align 8, !tbaa !5
  %16 = load ptr, ptr %11, align 8, !tbaa !5
  %17 = getelementptr inbounds i8, ptr %16, i64 8
  store ptr %12, ptr %17, align 8, !tbaa !5
  %18 = load ptr, ptr %11, align 8, !tbaa !5
  %19 = load ptr, ptr %8, align 8, !tbaa !5
  %.not25 = icmp eq ptr %19, null
  br i1 %.not25, label %.critedge, label %.preheader, !llvm.loop !11

.critedge:                                        ; preds = %.preheader, %10, %1, %2, %5
  ret ptr %0
}

attributes #0 = { mustprogress 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 = !{!"_ZTS8ListNode", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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