; LLVM IR from JessonYue/LeetCodeLearning :: Array/fanbei/0701/c (solution07_01)

; 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 i32 @KthToLast(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = icmp eq ptr %8, null
  br i1 %9, label %10, label %11

10:                                               ; preds = %2
  store i32 -1, ptr %3, align 4
  br label %38

11:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %12, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %13, ptr %7, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %17, %11
  %15 = load i32, ptr %5, align 4, !tbaa !9
  %16 = icmp ne i32 %15, 0
  br i1 %16, label %17, label %23

17:                                               ; preds = %14
  %18 = load ptr, ptr %6, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.ListNode, ptr %18, i32 0, i32 1
  %20 = load ptr, ptr %19, align 8, !tbaa !11
  store ptr %20, ptr %6, align 8, !tbaa !5
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = add nsw i32 %21, -1
  store i32 %22, ptr %5, align 4, !tbaa !9
  br label %14, !llvm.loop !13

23:                                               ; preds = %14
  br label %24

24:                                               ; preds = %27, %23
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = icmp ne ptr %25, null
  br i1 %26, label %27, label %34

27:                                               ; preds = %24
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.ListNode, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !11
  store ptr %30, ptr %6, align 8, !tbaa !5
  %31 = load ptr, ptr %7, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.ListNode, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !11
  store ptr %33, ptr %7, align 8, !tbaa !5
  br label %24, !llvm.loop !15

34:                                               ; preds = %24
  %35 = load ptr, ptr %7, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.ListNode, ptr %35, i32 0, i32 0
  %37 = load i32, ptr %36, align 8, !tbaa !16
  store i32 %37, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %38

38:                                               ; preds = %34, %10
  %39 = load i32, ptr %3, align 4
  ret i32 %39
}

; 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"}
!15 = distinct !{!15, !14}
!16 = !{!12, !10, i64 0}


; 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(read, inaccessiblemem: none) uwtable
define dso_local i32 @KthToLast(ptr noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  br i1 %3, label %30, label %.preheader15

.preheader15:                                     ; preds = %2
  %.not16 = icmp eq i32 %1, 0
  br i1 %.not16, label %.lr.ph22.preheader, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %.preheader15
  %xtraiter = and i32 %1, 7
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader, %.lr.ph.prol
  %.01018.prol = phi ptr [ %5, %.lr.ph.prol ], [ %0, %.lr.ph.preheader ]
  %.01117.prol = phi i32 [ %6, %.lr.ph.prol ], [ %1, %.lr.ph.preheader ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader ]
  %4 = getelementptr inbounds i8, ptr %.01018.prol, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %6 = add nsw i32 %.01117.prol, -1
  %prol.iter.next = add i32 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i32 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !11

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader
  %.lcssa30.unr = phi ptr [ poison, %.lr.ph.preheader ], [ %5, %.lr.ph.prol ]
  %.01018.unr = phi ptr [ %0, %.lr.ph.preheader ], [ %5, %.lr.ph.prol ]
  %.01117.unr = phi i32 [ %1, %.lr.ph.preheader ], [ %6, %.lr.ph.prol ]
  %7 = icmp ult i32 %1, 8
  br i1 %7, label %.preheader, label %.lr.ph

.preheader:                                       ; preds = %.lr.ph, %.lr.ph.prol.loopexit
  %.lcssa30 = phi ptr [ %.lcssa30.unr, %.lr.ph.prol.loopexit ], [ %23, %.lr.ph ]
  %.not1419 = icmp eq ptr %.lcssa30, null
  br i1 %.not1419, label %._crit_edge, label %.lr.ph22.preheader

.lr.ph22.preheader:                               ; preds = %.preheader15, %.preheader
  %.120.ph = phi ptr [ %.lcssa30, %.preheader ], [ %0, %.preheader15 ]
  br label %.lr.ph22

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.01018 = phi ptr [ %23, %.lr.ph ], [ %.01018.unr, %.lr.ph.prol.loopexit ]
  %.01117 = phi i32 [ %24, %.lr.ph ], [ %.01117.unr, %.lr.ph.prol.loopexit ]
  %8 = getelementptr inbounds i8, ptr %.01018, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %9, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  %12 = getelementptr inbounds i8, ptr %11, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %13, i64 8
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %15, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %17, i64 8
  %19 = load ptr, ptr %18, align 8, !tbaa !5
  %20 = getelementptr inbounds i8, ptr %19, i64 8
  %21 = load ptr, ptr %20, align 8, !tbaa !5
  %22 = getelementptr inbounds i8, ptr %21, i64 8
  %23 = load ptr, ptr %22, align 8, !tbaa !5
  %24 = add nsw i32 %.01117, -8
  %.not.7 = icmp eq i32 %24, 0
  br i1 %.not.7, label %.preheader, label %.lr.ph, !llvm.loop !13

.lr.ph22:                                         ; preds = %.lr.ph22.preheader, %.lr.ph22
  %.021 = phi ptr [ %28, %.lr.ph22 ], [ %0, %.lr.ph22.preheader ]
  %.120 = phi ptr [ %26, %.lr.ph22 ], [ %.120.ph, %.lr.ph22.preheader ]
  %25 = getelementptr inbounds i8, ptr %.120, i64 8
  %26 = load ptr, ptr %25, align 8, !tbaa !5
  %27 = getelementptr inbounds i8, ptr %.021, i64 8
  %28 = load ptr, ptr %27, align 8, !tbaa !5
  %.not14 = icmp eq ptr %26, null
  br i1 %.not14, label %._crit_edge, label %.lr.ph22, !llvm.loop !15

._crit_edge:                                      ; preds = %.lr.ph22, %.preheader
  %.0.lcssa = phi ptr [ %0, %.preheader ], [ %28, %.lr.ph22 ]
  %29 = load i32, ptr %.0.lcssa, align 8, !tbaa !16
  br label %30

30:                                               ; preds = %2, %._crit_edge
  %.012 = phi i32 [ %29, %._crit_edge ], [ -1, %2 ]
  ret i32 %.012
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, 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.unroll.disable"}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}
!16 = !{!6, !7, i64 0}


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