; LLVM IR from JessonYue/LeetCodeLearning :: Array/linchuanxin/Algorithm/day59_0729_链表排序 (day59_leetcode148)

; 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 @cut(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = icmp sle i32 %9, 0
  br i1 %10, label %11, label %13

11:                                               ; preds = %2
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %12, ptr %3, align 8
  br label %40

13:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %14, ptr %6, align 8, !tbaa !5
  br label %15

15:                                               ; preds = %24, %13
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = add nsw i32 %16, -1
  store i32 %17, ptr %5, align 4, !tbaa !9
  %18 = icmp sgt i32 %17, 0
  br i1 %18, label %19, label %22

19:                                               ; preds = %15
  %20 = load ptr, ptr %6, align 8, !tbaa !5
  %21 = icmp ne ptr %20, null
  br label %22

22:                                               ; preds = %19, %15
  %23 = phi i1 [ false, %15 ], [ %21, %19 ]
  br i1 %23, label %24, label %28

24:                                               ; preds = %22
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.ListNode, ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !11
  store ptr %27, ptr %6, align 8, !tbaa !5
  br label %15, !llvm.loop !13

28:                                               ; preds = %22
  %29 = load ptr, ptr %6, align 8, !tbaa !5
  %30 = icmp eq ptr %29, null
  br i1 %30, label %31, label %32

31:                                               ; preds = %28
  store ptr null, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %39

32:                                               ; preds = %28
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %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 !11
  store ptr %35, ptr %8, align 8, !tbaa !5
  %36 = load ptr, ptr %6, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.ListNode, ptr %36, i32 0, i32 1
  store ptr null, ptr %37, align 8, !tbaa !11
  %38 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %38, ptr %3, align 8
  store i32 1, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  br label %39

39:                                               ; preds = %32, %31
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %40

40:                                               ; preds = %39, %11
  %41 = load ptr, ptr %3, align 8
  ret ptr %41
}

; 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 ptr @cut(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %1, 1
  br i1 %3, label %17, label %.preheader

.preheader:                                       ; preds = %2
  %4 = icmp ne i32 %1, 1
  %5 = icmp ne ptr %0, null
  %6 = and i1 %4, %5
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.01015 = phi ptr [ %9, %.lr.ph ], [ %0, %.preheader ]
  %.01114 = phi i32 [ %7, %.lr.ph ], [ %1, %.preheader ]
  %7 = add nsw i32 %.01114, -1
  %8 = getelementptr inbounds i8, ptr %.01015, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = icmp ugt i32 %.01114, 2
  %11 = icmp ne ptr %9, null
  %12 = select i1 %10, i1 %11, i1 false
  br i1 %12, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.010.lcssa = phi ptr [ %0, %.preheader ], [ %9, %.lr.ph ]
  %13 = icmp eq ptr %.010.lcssa, null
  br i1 %13, label %17, label %14

14:                                               ; preds = %._crit_edge
  %15 = getelementptr inbounds i8, ptr %.010.lcssa, i64 8
  %16 = load ptr, ptr %15, align 8, !tbaa !5
  store ptr null, ptr %15, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %14, %._crit_edge, %2
  %.1 = phi ptr [ %0, %2 ], [ %16, %14 ], [ null, %._crit_edge ]
  ret ptr %.1
}

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