; LLVM IR from upupming/algorithm :: acwing/算法基础课/第五讲 动态规划/树形DP/285. 没有上司的舞会.ll (Z3dfsi)

; 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"

@head = external dso_local global [6010 x i32], align 16
@ver = external dso_local global [6010 x i32], align 16
@Next = external dso_local global [6010 x i32], align 16
@h = external dso_local global [6010 x i32], align 16
@f = external dso_local global [6010 x [2 x i32]], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = sext i32 %5 to i64
  %7 = getelementptr inbounds [6010 x i32], ptr @h, i64 0, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [6010 x [2 x i32]], ptr @f, i64 0, i64 %10
  %12 = getelementptr inbounds [2 x i32], ptr %11, i64 0, i64 1
  store i32 %8, ptr %12, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [6010 x i32], ptr @head, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  store i32 %16, ptr %3, align 4, !tbaa !5
  br label %17

17:                                               ; preds = %54, %1
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = icmp ne i32 %18, 0
  br i1 %19, label %21, label %20

20:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %59

21:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds [6010 x i32], ptr @ver, i64 0, i64 %23
  %25 = load i32, ptr %24, align 4, !tbaa !5
  store i32 %25, ptr %4, align 4, !tbaa !5
  %26 = load i32, ptr %4, align 4, !tbaa !5
  call void @_Z3dfsi(i32 noundef %26)
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [6010 x [2 x i32]], ptr @f, i64 0, i64 %28
  %30 = getelementptr inbounds [2 x i32], ptr %29, i64 0, i64 0
  %31 = load i32, ptr %30, align 8, !tbaa !5
  %32 = load i32, ptr %2, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [6010 x [2 x i32]], ptr @f, i64 0, i64 %33
  %35 = getelementptr inbounds [2 x i32], ptr %34, i64 0, i64 1
  %36 = load i32, ptr %35, align 4, !tbaa !5
  %37 = add nsw i32 %36, %31
  store i32 %37, ptr %35, align 4, !tbaa !5
  %38 = load i32, ptr %4, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds [6010 x [2 x i32]], ptr @f, i64 0, i64 %39
  %41 = getelementptr inbounds [2 x i32], ptr %40, i64 0, i64 0
  %42 = load i32, ptr %4, align 4, !tbaa !5
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds [6010 x [2 x i32]], ptr @f, i64 0, i64 %43
  %45 = getelementptr inbounds [2 x i32], ptr %44, i64 0, i64 1
  %46 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %41, ptr noundef nonnull align 4 dereferenceable(4) %45)
  %47 = load i32, ptr %46, align 4, !tbaa !5
  %48 = load i32, ptr %2, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds [6010 x [2 x i32]], ptr @f, i64 0, i64 %49
  %51 = getelementptr inbounds [2 x i32], ptr %50, i64 0, i64 0
  %52 = load i32, ptr %51, align 8, !tbaa !5
  %53 = add nsw i32 %52, %47
  store i32 %53, ptr %51, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %54

54:                                               ; preds = %21
  %55 = load i32, ptr %3, align 4, !tbaa !5
  %56 = sext i32 %55 to i64
  %57 = getelementptr inbounds [6010 x i32], ptr @Next, i64 0, i64 %56
  %58 = load i32, ptr %57, align 4, !tbaa !5
  store i32 %58, ptr %3, align 4, !tbaa !5
  br label %17, !llvm.loop !9

59:                                               ; preds = %20
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { mustprogress 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 = { inlinehint mustprogress 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 #3 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

@head = external dso_local local_unnamed_addr global [6010 x i32], align 16
@ver = external dso_local local_unnamed_addr global [6010 x i32], align 16
@Next = external dso_local local_unnamed_addr global [6010 x i32], align 16
@h = external dso_local local_unnamed_addr global [6010 x i32], align 16
@f = external dso_local global [6010 x [2 x i32]], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3dfsi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = sext i32 %0 to i64
  %3 = getelementptr inbounds [6010 x i32], ptr @h, i64 0, i64 %2
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = getelementptr inbounds [6010 x [2 x i32]], ptr @f, i64 0, i64 %2
  %6 = getelementptr inbounds i8, ptr %5, i64 4
  store i32 %4, ptr %6, align 4, !tbaa !5
  %7 = getelementptr inbounds [6010 x i32], ptr @head, i64 0, i64 %2
  %.012 = load i32, ptr %7, align 4, !tbaa !5
  %.not13 = icmp eq i32 %.012, 0
  br i1 %.not13, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %1
  ret void

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.014 = phi i32 [ %.0, %.lr.ph ], [ %.012, %1 ]
  %8 = sext i32 %.014 to i64
  %9 = getelementptr inbounds [6010 x i32], ptr @ver, i64 0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  tail call void @_Z3dfsi(i32 noundef %10)
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [6010 x [2 x i32]], ptr @f, i64 0, i64 %11
  %13 = load i32, ptr %12, align 8, !tbaa !5
  %14 = load i32, ptr %6, align 4, !tbaa !5
  %15 = add nsw i32 %14, %13
  store i32 %15, ptr %6, align 4, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %12, i64 4
  %17 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %12, ptr noundef nonnull align 4 dereferenceable(4) %16)
  %18 = load i32, ptr %17, align 4, !tbaa !5
  %19 = load i32, ptr %5, align 8, !tbaa !5
  %20 = add nsw i32 %19, %18
  store i32 %20, ptr %5, align 8, !tbaa !5
  %21 = getelementptr inbounds [6010 x i32], ptr @Next, i64 0, i64 %8
  %.0 = load i32, ptr %21, align 4, !tbaa !5
  %.not = icmp eq i32 %.0, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #1

attributes #0 = { mustprogress 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 = { inlinehint mustprogress 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" }

!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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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