; LLVM IR from JessonYue/LeetCodeLearning :: Array/caiweixiong/cpp/Homework_010.ll (ZN12Homework_01013oddEvenList_1EP8ListNode)

; 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: mustprogress nounwind uwtable
define dso_local noundef ptr @_ZN12Homework_01013oddEvenList_1EP8ListNode(ptr noundef nonnull align 1 dereferenceable(1) %0, ptr noundef %1) #0 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %9 = load ptr, ptr %4, align 8
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = icmp ne ptr %10, null
  br i1 %11, label %12, label %24

12:                                               ; preds = %2
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.ListNode, ptr %13, i32 0, i32 1
  %15 = load ptr, ptr %14, align 8, !tbaa !9
  %16 = icmp ne ptr %15, null
  br i1 %16, label %17, label %24

17:                                               ; preds = %12
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.ListNode, ptr %18, i32 0, i32 1
  %20 = load ptr, ptr %19, align 8, !tbaa !9
  %21 = getelementptr inbounds %struct.ListNode, ptr %20, i32 0, i32 1
  %22 = load ptr, ptr %21, align 8, !tbaa !9
  %23 = icmp ne ptr %22, null
  br i1 %23, label %26, label %24

24:                                               ; preds = %17, %12, %2
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %25, ptr %3, align 8
  br label %72

26:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %27, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.ListNode, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !9
  store ptr %30, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %31 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %31, ptr %8, align 8, !tbaa !5
  br label %32

32:                                               ; preds = %44, %26
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.ListNode, ptr %33, i32 0, i32 1
  %35 = load ptr, ptr %34, align 8, !tbaa !9
  %36 = icmp ne ptr %35, null
  br i1 %36, label %37, label %42

37:                                               ; preds = %32
  %38 = load ptr, ptr %8, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.ListNode, ptr %38, i32 0, i32 1
  %40 = load ptr, ptr %39, align 8, !tbaa !9
  %41 = icmp ne ptr %40, null
  br label %42

42:                                               ; preds = %37, %32
  %43 = phi i1 [ false, %32 ], [ %41, %37 ]
  br i1 %43, label %44, label %61

44:                                               ; preds = %42
  %45 = load ptr, ptr %8, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.ListNode, ptr %45, i32 0, i32 1
  %47 = load ptr, ptr %46, align 8, !tbaa !9
  %48 = load ptr, ptr %6, align 8, !tbaa !5
  %49 = getelementptr inbounds %struct.ListNode, ptr %48, i32 0, i32 1
  store ptr %47, ptr %49, align 8, !tbaa !9
  %50 = load ptr, ptr %6, align 8, !tbaa !5
  %51 = getelementptr inbounds %struct.ListNode, ptr %50, i32 0, i32 1
  %52 = load ptr, ptr %51, align 8, !tbaa !9
  store ptr %52, ptr %6, align 8, !tbaa !5
  %53 = load ptr, ptr %6, align 8, !tbaa !5
  %54 = getelementptr inbounds %struct.ListNode, ptr %53, i32 0, i32 1
  %55 = load ptr, ptr %54, align 8, !tbaa !9
  %56 = load ptr, ptr %8, align 8, !tbaa !5
  %57 = getelementptr inbounds %struct.ListNode, ptr %56, i32 0, i32 1
  store ptr %55, ptr %57, align 8, !tbaa !9
  %58 = load ptr, ptr %8, align 8, !tbaa !5
  %59 = getelementptr inbounds %struct.ListNode, ptr %58, i32 0, i32 1
  %60 = load ptr, ptr %59, align 8, !tbaa !9
  store ptr %60, ptr %8, align 8, !tbaa !5
  br label %32, !llvm.loop !12

61:                                               ; preds = %42
  %62 = load ptr, ptr %7, align 8, !tbaa !5
  %63 = load ptr, ptr %6, align 8, !tbaa !5
  %64 = getelementptr inbounds %struct.ListNode, ptr %63, i32 0, i32 1
  store ptr %62, ptr %64, align 8, !tbaa !9
  %65 = load ptr, ptr %8, align 8, !tbaa !5
  %66 = icmp ne ptr %65, null
  br i1 %66, label %67, label %70

67:                                               ; preds = %61
  %68 = load ptr, ptr %8, align 8, !tbaa !5
  %69 = getelementptr inbounds %struct.ListNode, ptr %68, i32 0, i32 1
  store ptr null, ptr %69, align 8, !tbaa !9
  br label %70

70:                                               ; preds = %67, %61
  %71 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %71, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %72

72:                                               ; preds = %70, %24
  %73 = load ptr, ptr %3, align 8
  ret ptr %73
}

; 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 = { 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 #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++ 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 @_ZN12Homework_01013oddEvenList_1EP8ListNode(ptr nocapture noundef nonnull readnone align 1 dereferenceable(1) %0, ptr noundef returned %1) local_unnamed_addr #0 align 2 {
  %.not = icmp eq ptr %1, null
  br i1 %.not, label %17, label %3

3:                                                ; preds = %2
  %4 = getelementptr inbounds i8, ptr %1, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %.not27 = icmp eq ptr %5, null
  br i1 %.not27, label %17, label %6

6:                                                ; preds = %3
  %7 = getelementptr inbounds i8, ptr %5, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !5
  %.not28 = icmp eq ptr %8, null
  br i1 %.not28, label %17, label %.lr.ph

.lr.ph:                                           ; preds = %6, %12
  %9 = phi ptr [ %13, %12 ], [ %4, %6 ]
  %.037 = phi ptr [ %14, %12 ], [ %5, %6 ]
  %10 = getelementptr inbounds i8, ptr %.037, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  %.not30 = icmp eq ptr %11, null
  br i1 %.not30, label %15, label %12

12:                                               ; preds = %.lr.ph
  store ptr %11, ptr %9, align 8, !tbaa !5
  %13 = getelementptr inbounds i8, ptr %11, i64 8
  %14 = load ptr, ptr %13, align 8, !tbaa !5
  store ptr %14, ptr %10, align 8, !tbaa !5
  %.not29 = icmp eq ptr %14, null
  br i1 %.not29, label %.critedge, label %.lr.ph, !llvm.loop !11

.critedge:                                        ; preds = %12
  store ptr %5, ptr %13, align 8, !tbaa !5
  br label %17

15:                                               ; preds = %.lr.ph
  store ptr %5, ptr %9, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %.037, i64 8
  store ptr null, ptr %16, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %.critedge, %15, %2, %3, %6
  ret ptr %1
}

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,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SCCPPass,SROAPass,SimplifyCFGPass