; LLVM IR from brpapa/algorithms :: solutions/timus/1225.ll (Z2dpi)

; 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"

%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl" }
%"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl" = type { %"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl_data" }
%"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl_data" = type { ptr, ptr, ptr }

@N = external dso_local global i32, align 4
@memo = external dso_local global %"class.std::vector", align 8

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z2dpi(i32 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = load i32, ptr @N, align 4, !tbaa !5
  %8 = icmp eq i32 %6, %7
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store i64 1, ptr %2, align 8
  br label %43

10:                                               ; preds = %1
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = load i32, ptr @N, align 4, !tbaa !5
  %13 = icmp sgt i32 %11, %12
  br i1 %13, label %14, label %15

14:                                               ; preds = %10
  store i64 0, ptr %2, align 8
  br label %43

15:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIxSaIxEEixEm(ptr noundef nonnull align 8 dereferenceable(24) @memo, i64 noundef %17) #3
  store ptr %18, ptr %4, align 8, !tbaa !9
  %19 = load ptr, ptr %4, align 8, !tbaa !9
  %20 = load i64, ptr %19, align 8, !tbaa !11
  %21 = icmp ne i64 %20, -1
  br i1 %21, label %22, label %25

22:                                               ; preds = %15
  %23 = load ptr, ptr %4, align 8, !tbaa !9
  %24 = load i64, ptr %23, align 8, !tbaa !11
  store i64 %24, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %42

25:                                               ; preds = %15
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = add nsw i32 %26, 1
  %28 = call noundef i64 @_Z2dpi(i32 noundef %27)
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = add nsw i32 %29, 2
  %31 = load i32, ptr @N, align 4, !tbaa !5
  %32 = icmp slt i32 %30, %31
  br i1 %32, label %33, label %37

33:                                               ; preds = %25
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = add nsw i32 %34, 2
  %36 = call noundef i64 @_Z2dpi(i32 noundef %35)
  br label %38

37:                                               ; preds = %25
  br label %38

38:                                               ; preds = %37, %33
  %39 = phi i64 [ %36, %33 ], [ 0, %37 ]
  %40 = add nsw i64 %28, %39
  %41 = load ptr, ptr %4, align 8, !tbaa !9
  store i64 %40, ptr %41, align 8, !tbaa !11
  store i64 %40, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %42

42:                                               ; preds = %38, %22
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %43

43:                                               ; preds = %42, %14, %9
  %44 = load i64, ptr %2, align 8
  ret i64 %44
}

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIxSaIxEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 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 = { 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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, 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"

%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl" }
%"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl" = type { %"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl_data" }
%"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl_data" = type { ptr, ptr, ptr }

@N = external dso_local local_unnamed_addr global i32, align 4
@memo = external dso_local global %"class.std::vector", align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z2dpi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @N, align 4, !tbaa !5
  %3 = icmp eq i32 %2, %0
  br i1 %3, label %21, label %4

4:                                                ; preds = %1
  %5 = icmp slt i32 %2, %0
  br i1 %5, label %21, label %6

6:                                                ; preds = %4
  %7 = sext i32 %0 to i64
  %8 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIxSaIxEEixEm(ptr noundef nonnull align 8 dereferenceable(24) @memo, i64 noundef %7) #1
  %9 = load i64, ptr %8, align 8, !tbaa !9
  %.not = icmp eq i64 %9, -1
  br i1 %.not, label %10, label %21

10:                                               ; preds = %6
  %11 = add nsw i32 %0, 1
  %12 = tail call noundef i64 @_Z2dpi(i32 noundef %11)
  %13 = add nsw i32 %0, 2
  %14 = load i32, ptr @N, align 4, !tbaa !5
  %15 = icmp slt i32 %13, %14
  br i1 %15, label %16, label %18

16:                                               ; preds = %10
  %17 = tail call noundef i64 @_Z2dpi(i32 noundef %13)
  br label %18

18:                                               ; preds = %10, %16
  %19 = phi i64 [ %17, %16 ], [ 0, %10 ]
  %20 = add nsw i64 %19, %12
  store i64 %20, ptr %8, align 8, !tbaa !9
  br label %21

21:                                               ; preds = %18, %6, %4, %1
  %.1 = phi i64 [ 1, %1 ], [ 0, %4 ], [ %20, %18 ], [ %9, %6 ]
  ret i64 %.1
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIxSaIxEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

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 = { 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, !10, i64 0}
!10 = !{!"long long", !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass