; LLVM IR from lzyrapx/Competitive-Programming :: ACdream/1102（树形dp）（背包dp）.ll (Z3preii)

; 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.edge = type { i32, i32 }

@tree = external dso_local global [30005 x %struct.edge], align 16
@head = external dso_local global [30005 x i32], align 16
@fa = external dso_local global [3005 x i32], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3preii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [3005 x i32], ptr @fa, i64 0, i64 %8
  store i32 %6, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [30005 x i32], ptr @head, i64 0, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !5
  store i32 %13, ptr %5, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %34, %2
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = icmp ne i32 %15, -1
  br i1 %16, label %18, label %17

17:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %40

18:                                               ; preds = %14
  %19 = load i32, ptr %5, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [30005 x %struct.edge], ptr @tree, i64 0, i64 %20
  %22 = getelementptr inbounds %struct.edge, ptr %21, i32 0, i32 1
  %23 = load i32, ptr %22, align 4, !tbaa !9
  %24 = load i32, ptr %4, align 4, !tbaa !5
  %25 = icmp eq i32 %23, %24
  br i1 %25, label %26, label %27

26:                                               ; preds = %18
  br label %34

27:                                               ; preds = %18
  %28 = load i32, ptr %5, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [30005 x %struct.edge], ptr @tree, i64 0, i64 %29
  %31 = getelementptr inbounds %struct.edge, ptr %30, i32 0, i32 1
  %32 = load i32, ptr %31, align 4, !tbaa !9
  %33 = load i32, ptr %3, align 4, !tbaa !5
  call void @_Z3preii(i32 noundef %32, i32 noundef %33)
  br label %34

34:                                               ; preds = %27, %26
  %35 = load i32, ptr %5, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [30005 x %struct.edge], ptr @tree, i64 0, i64 %36
  %38 = getelementptr inbounds %struct.edge, ptr %37, i32 0, i32 0
  %39 = load i32, ptr %38, align 8, !tbaa !11
  store i32 %39, ptr %5, align 4, !tbaa !5
  br label %14, !llvm.loop !12

40:                                               ; preds = %17
  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: 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 = { 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 = !{!10, !6, i64 4}
!10 = !{!"_ZTS4edge", !6, i64 0, !6, i64 4}
!11 = !{!10, !6, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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"

%struct.edge = type { i32, i32 }

@tree = external dso_local local_unnamed_addr global [30005 x %struct.edge], align 16
@head = external dso_local local_unnamed_addr global [30005 x i32], align 16
@fa = external dso_local local_unnamed_addr global [3005 x i32], align 16

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z3preii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = sext i32 %0 to i64
  %4 = getelementptr inbounds [3005 x i32], ptr @fa, i64 0, i64 %3
  store i32 %1, ptr %4, align 4, !tbaa !5
  %5 = getelementptr inbounds [30005 x i32], ptr @head, i64 0, i64 %3
  %.010 = load i32, ptr %5, align 4, !tbaa !5
  %.not11 = icmp eq i32 %.010, -1
  br i1 %.not11, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %12, %2
  ret void

.lr.ph:                                           ; preds = %2, %12
  %.012 = phi i32 [ %.0, %12 ], [ %.010, %2 ]
  %6 = sext i32 %.012 to i64
  %7 = getelementptr inbounds [30005 x %struct.edge], ptr @tree, i64 0, i64 %6
  %8 = getelementptr inbounds i8, ptr %7, i64 4
  %9 = load i32, ptr %8, align 4, !tbaa !9
  %10 = icmp eq i32 %9, %1
  br i1 %10, label %12, label %11

11:                                               ; preds = %.lr.ph
  tail call void @_Z3preii(i32 noundef %9, i32 noundef %0)
  br label %12

12:                                               ; preds = %.lr.ph, %11
  %.0 = load i32, ptr %7, align 8, !tbaa !5
  %.not = icmp eq i32 %.0, -1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11
}

attributes #0 = { mustprogress nofree nosync nounwind memory(readwrite, argmem: none, 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, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 4}
!10 = !{!"_ZTS4edge", !6, i64 0, !6, i64 4}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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