; LLVM IR from int32bit/leetcode :: algorithms/RemoveNthNodeFromEndofList (solve)

; 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 void @init(ptr noundef %0, ptr noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %10 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %10, ptr %7, align 8, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = getelementptr inbounds i32, ptr %11, i64 0
  %13 = load i32, ptr %12, align 4, !tbaa !9
  %14 = load ptr, ptr %7, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.ListNode, ptr %14, i32 0, i32 0
  store i32 %13, ptr %15, align 8, !tbaa !11
  %16 = load ptr, ptr %7, align 8, !tbaa !5
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %16, ptr %17, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 1, ptr %8, align 4, !tbaa !9
  br label %18

18:                                               ; preds = %36, %3
  %19 = load i32, ptr %8, align 4, !tbaa !9
  %20 = load i32, ptr %6, align 4, !tbaa !9
  %21 = icmp slt i32 %19, %20
  br i1 %21, label %23, label %22

22:                                               ; preds = %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  br label %39

23:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %24 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %24, ptr %9, align 8, !tbaa !5
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = load i32, ptr %8, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i32, ptr %25, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !9
  %30 = load ptr, ptr %9, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.ListNode, ptr %30, i32 0, i32 0
  store i32 %29, ptr %31, align 8, !tbaa !11
  %32 = load ptr, ptr %9, align 8, !tbaa !5
  %33 = load ptr, ptr %7, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.ListNode, ptr %33, i32 0, i32 1
  store ptr %32, ptr %34, align 8, !tbaa !13
  %35 = load ptr, ptr %9, align 8, !tbaa !5
  store ptr %35, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  br label %36

36:                                               ; preds = %23
  %37 = load i32, ptr %8, align 4, !tbaa !9
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %8, align 4, !tbaa !9
  br label %18, !llvm.loop !14

39:                                               ; preds = %22
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  ret void
}

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

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 allocsize(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 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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, !10, i64 0}
!12 = !{!"ListNode", !10, i64 0, !6, i64 8}
!13 = !{!12, !6, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"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 nounwind memory(write, argmem: readwrite, inaccessiblemem: readwrite) uwtable
define dso_local void @init(ptr nocapture noundef writeonly %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #2
  %5 = load i32, ptr %1, align 4, !tbaa !5
  store i32 %5, ptr %4, align 8, !tbaa !9
  store ptr %4, ptr %0, align 8, !tbaa !12
  %6 = icmp sgt i32 %2, 1
  br i1 %6, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %wide.trip.count = zext nneg i32 %2 to i64
  br label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %3
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %.014 = phi ptr [ %4, %.lr.ph.preheader ], [ %7, %.lr.ph ]
  %7 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #2
  %8 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv
  %9 = load i32, ptr %8, align 4, !tbaa !5
  store i32 %9, ptr %7, align 8, !tbaa !9
  %10 = getelementptr inbounds i8, ptr %.014, i64 8
  store ptr %7, ptr %10, align 8, !tbaa !13
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !14
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

attributes #0 = { nofree nounwind memory(write, argmem: readwrite, inaccessiblemem: readwrite) 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 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 allocsize(0) }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"ListNode", !6, i64 0, !11, i64 8}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!11, !11, i64 0}
!13 = !{!10, !11, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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