; LLVM IR from JessonYue/LeetCodeLearning :: Array/yangxin (linklist)

; 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: nounwind uwtable
define dso_local ptr @oddEvenList(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 eq ptr %7, null
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store ptr null, ptr %2, align 8
  br label %52

10:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %11, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.ListNode, ptr %12, i32 0, i32 1
  %14 = load ptr, ptr %13, align 8, !tbaa !9
  store ptr %14, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %15, ptr %6, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %35, %10
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = icmp ne ptr %17, null
  br i1 %18, label %19, label %22

19:                                               ; preds = %16
  %20 = load ptr, ptr %6, align 8, !tbaa !5
  %21 = icmp ne ptr %20, null
  br label %22

22:                                               ; preds = %19, %16
  %23 = phi i1 [ false, %16 ], [ %21, %19 ]
  br i1 %23, label %24, label %47

24:                                               ; preds = %22
  %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
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.ListNode, ptr %28, i32 0, i32 1
  store ptr %27, ptr %29, align 8, !tbaa !9
  %30 = load ptr, ptr %4, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.ListNode, ptr %30, i32 0, i32 1
  %32 = load ptr, ptr %31, align 8, !tbaa !9
  %33 = icmp eq ptr %32, null
  br i1 %33, label %34, label %35

34:                                               ; preds = %24
  br label %47

35:                                               ; preds = %24
  %36 = load ptr, ptr %4, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.ListNode, ptr %36, i32 0, i32 1
  %38 = load ptr, ptr %37, align 8, !tbaa !9
  store ptr %38, ptr %4, align 8, !tbaa !5
  %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
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.ListNode, ptr %42, i32 0, i32 1
  store ptr %41, ptr %43, align 8, !tbaa !9
  %44 = load ptr, ptr %5, align 8, !tbaa !5
  %45 = getelementptr inbounds %struct.ListNode, ptr %44, i32 0, i32 1
  %46 = load ptr, ptr %45, align 8, !tbaa !9
  store ptr %46, ptr %5, align 8, !tbaa !5
  br label %16, !llvm.loop !12

47:                                               ; preds = %34, %22
  %48 = load ptr, ptr %6, align 8, !tbaa !5
  %49 = load ptr, ptr %4, align 8, !tbaa !5
  %50 = getelementptr inbounds %struct.ListNode, ptr %49, i32 0, i32 1
  store ptr %48, ptr %50, align 8, !tbaa !9
  %51 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %51, 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 %52

52:                                               ; preds = %47, %9
  %53 = load ptr, ptr %2, align 8
  ret ptr %53
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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/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 noundef ptr @oddEvenList(ptr noundef returned %0) local_unnamed_addr #0 {
  %2 = icmp eq ptr %0, null
  br i1 %2, label %14, label %3

3:                                                ; preds = %1
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %.not = icmp eq ptr %5, null
  br i1 %.not, label %._crit_edge, label %.lr.ph.split

.lr.ph.split:                                     ; preds = %3, %10
  %.01722 = phi ptr [ %12, %10 ], [ %5, %3 ]
  %.01821 = phi ptr [ %7, %10 ], [ %0, %3 ]
  %6 = getelementptr inbounds i8, ptr %.01722, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %.01821, i64 8
  store ptr %7, ptr %8, align 8, !tbaa !5
  %9 = icmp eq ptr %7, null
  br i1 %9, label %._crit_edge, label %10

10:                                               ; preds = %.lr.ph.split
  %11 = getelementptr inbounds i8, ptr %7, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !5
  store ptr %12, ptr %6, align 8, !tbaa !5
  %.not26 = icmp eq ptr %12, null
  br i1 %.not26, label %._crit_edge, label %.lr.ph.split, !llvm.loop !11

._crit_edge:                                      ; preds = %10, %.lr.ph.split, %3
  %.018.lcssa = phi ptr [ %0, %3 ], [ %.01821, %.lr.ph.split ], [ %7, %10 ]
  %13 = getelementptr inbounds i8, ptr %.018.lcssa, i64 8
  store ptr %5, ptr %13, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %1, %._crit_edge
  ret ptr %0
}

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,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass