; LLVM IR from lolosssss/leetcode :: c (328_odd_even_linked_list)

; 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 @oddEvenList(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
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %10, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store ptr null, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store ptr null, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  store ptr null, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 1, ptr %8, align 4, !tbaa !9
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = icmp eq ptr %11, null
  br i1 %12, label %13, label %14

13:                                               ; preds = %1
  store ptr null, ptr %2, align 8
  store i32 1, ptr %9, align 4
  br label %57

14:                                               ; preds = %1
  %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 !11
  store ptr %17, ptr %6, align 8, !tbaa !5
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %18, ptr %7, align 8, !tbaa !5
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.ListNode, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !11
  store ptr %21, ptr %5, align 8, !tbaa !5
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.ListNode, ptr %22, i32 0, i32 1
  %24 = load ptr, ptr %23, align 8, !tbaa !11
  store ptr %24, ptr %4, align 8, !tbaa !5
  br label %25

25:                                               ; preds = %46, %14
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = icmp ne ptr %26, null
  br i1 %27, label %28, label %52

28:                                               ; preds = %25
  %29 = load i32, ptr %8, align 4, !tbaa !9
  %30 = srem i32 %29, 2
  %31 = icmp eq i32 %30, 0
  br i1 %31, label %32, label %39

32:                                               ; preds = %28
  %33 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %33, ptr %7, align 8, !tbaa !5
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.ListNode, ptr %34, i32 0, i32 1
  %36 = load ptr, ptr %35, align 8, !tbaa !11
  %37 = load ptr, ptr %6, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.ListNode, ptr %37, i32 0, i32 1
  store ptr %36, ptr %38, align 8, !tbaa !11
  br label %46

39:                                               ; preds = %28
  %40 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %40, ptr %6, align 8, !tbaa !5
  %41 = load ptr, ptr %4, align 8, !tbaa !5
  %42 = getelementptr inbounds %struct.ListNode, ptr %41, i32 0, i32 1
  %43 = load ptr, ptr %42, align 8, !tbaa !11
  %44 = load ptr, ptr %7, align 8, !tbaa !5
  %45 = getelementptr inbounds %struct.ListNode, ptr %44, i32 0, i32 1
  store ptr %43, ptr %45, align 8, !tbaa !11
  br label %46

46:                                               ; preds = %39, %32
  %47 = load i32, ptr %8, align 4, !tbaa !9
  %48 = add nsw i32 %47, 1
  store i32 %48, ptr %8, align 4, !tbaa !9
  %49 = load ptr, ptr %4, align 8, !tbaa !5
  %50 = getelementptr inbounds %struct.ListNode, ptr %49, i32 0, i32 1
  %51 = load ptr, ptr %50, align 8, !tbaa !11
  store ptr %51, ptr %4, align 8, !tbaa !5
  br label %25, !llvm.loop !13

52:                                               ; preds = %25
  %53 = load ptr, ptr %5, align 8, !tbaa !5
  %54 = load ptr, ptr %7, align 8, !tbaa !5
  %55 = getelementptr inbounds %struct.ListNode, ptr %54, i32 0, i32 1
  store ptr %53, ptr %55, align 8, !tbaa !11
  %56 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %56, ptr %2, align 8
  store i32 1, ptr %9, align 4
  br label %57

57:                                               ; preds = %52, %13
  call void @llvm.lifetime.end.p0(i64 4, 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
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %58 = load ptr, ptr %2, align 8
  ret ptr %58
}

; 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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"ListNode", !10, i64 0, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"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 %13, label %3

3:                                                ; preds = %1
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %.not25 = icmp eq ptr %5, null
  br i1 %.not25, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %.lr.ph
  %.029 = phi i32 [ %11, %.lr.ph ], [ 1, %3 ]
  %.01928 = phi ptr [ %.02226..01928, %.lr.ph ], [ %0, %3 ]
  %.02027 = phi ptr [ %.02027..02226, %.lr.ph ], [ %5, %3 ]
  %.02226 = phi ptr [ %9, %.lr.ph ], [ %5, %3 ]
  %6 = and i32 %.029, 1
  %7 = icmp eq i32 %6, 0
  %8 = getelementptr inbounds i8, ptr %.02226, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %.02027..01928 = select i1 %7, ptr %.02027, ptr %.01928
  %.02027..02226 = select i1 %7, ptr %.02027, ptr %.02226
  %.02226..01928 = select i1 %7, ptr %.02226, ptr %.01928
  %10 = getelementptr inbounds i8, ptr %.02027..01928, i64 8
  store ptr %9, ptr %10, align 8, !tbaa !5
  %11 = add nuw nsw i32 %.029, 1
  %.not = icmp eq ptr %9, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph, %3
  %.019.lcssa = phi ptr [ %0, %3 ], [ %.02226..01928, %.lr.ph ]
  %12 = getelementptr inbounds i8, ptr %.019.lcssa, i64 8
  store ptr %5, ptr %12, align 8, !tbaa !5
  br label %13

13:                                               ; 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: BDCEPass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass