; LLVM IR from kazunetakahashi/atcoder :: 201510_201609/0208_ABC033/D.ll (Z8subcountPxd)

; 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<double, std::allocator<double>>::_Vector_impl" }
%"struct.std::_Vector_base<double, std::allocator<double>>::_Vector_impl" = type { %"struct.std::_Vector_base<double, std::allocator<double>>::_Vector_impl_data" }
%"struct.std::_Vector_base<double, std::allocator<double>>::_Vector_impl_data" = type { ptr, ptr, ptr }

@N = external dso_local global i64, align 8
@V = external dso_local global %"class.std::vector", align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z8subcountPxd(ptr noundef %0, double noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca double, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store double %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 1, ptr %6, align 8, !tbaa !11
  br label %7

7:                                                ; preds = %35, %2
  %8 = load i64, ptr %5, align 8, !tbaa !11
  %9 = load i64, ptr @N, align 8, !tbaa !11
  %10 = sub nsw i64 %9, 1
  %11 = icmp slt i64 %8, %10
  br i1 %11, label %12, label %36

12:                                               ; preds = %7
  %13 = load i64, ptr %6, align 8, !tbaa !11
  %14 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIdSaIdEEixEm(ptr noundef nonnull align 8 dereferenceable(24) @V, i64 noundef %13) #2
  %15 = load double, ptr %14, align 8, !tbaa !9
  %16 = load i64, ptr %5, align 8, !tbaa !11
  %17 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIdSaIdEEixEm(ptr noundef nonnull align 8 dereferenceable(24) @V, i64 noundef %16) #2
  %18 = load double, ptr %17, align 8, !tbaa !9
  %19 = fsub double %15, %18
  %20 = load double, ptr %4, align 8, !tbaa !9
  %21 = fcmp olt double %19, %20
  br i1 %21, label %22, label %25

22:                                               ; preds = %12
  %23 = load i64, ptr %6, align 8, !tbaa !11
  %24 = add nsw i64 %23, 1
  store i64 %24, ptr %6, align 8, !tbaa !11
  br label %35

25:                                               ; preds = %12
  %26 = load i64, ptr %6, align 8, !tbaa !11
  %27 = load i64, ptr %5, align 8, !tbaa !11
  %28 = sub nsw i64 %26, %27
  %29 = sub nsw i64 %28, 1
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = load i64, ptr %30, align 8, !tbaa !11
  %32 = add nsw i64 %31, %29
  store i64 %32, ptr %30, align 8, !tbaa !11
  %33 = load i64, ptr %5, align 8, !tbaa !11
  %34 = add nsw i64 %33, 1
  store i64 %34, ptr %5, align 8, !tbaa !11
  br label %35

35:                                               ; preds = %25, %22
  br label %7, !llvm.loop !13

36:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  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: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIdSaIdEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #0 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 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"double", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}
!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"

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

@N = external dso_local local_unnamed_addr global i64, align 8
@V = external dso_local global %"class.std::vector", align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z8subcountPxd(ptr nocapture noundef %0, double noundef %1) local_unnamed_addr #0 {
  %3 = load i64, ptr @N, align 8, !tbaa !5
  %4 = icmp sgt i64 %3, 1
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %19
  %.011 = phi i64 [ %.1, %19 ], [ 1, %2 ]
  %.0810 = phi i64 [ %.19, %19 ], [ 0, %2 ]
  %5 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIdSaIdEEixEm(ptr noundef nonnull align 8 dereferenceable(24) @V, i64 noundef %.011) #1
  %6 = load double, ptr %5, align 8, !tbaa !9
  %7 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIdSaIdEEixEm(ptr noundef nonnull align 8 dereferenceable(24) @V, i64 noundef %.0810) #1
  %8 = load double, ptr %7, align 8, !tbaa !9
  %9 = fsub double %6, %8
  %10 = fcmp olt double %9, %1
  br i1 %10, label %11, label %13

11:                                               ; preds = %.lr.ph
  %12 = add nsw i64 %.011, 1
  br label %19

13:                                               ; preds = %.lr.ph
  %14 = xor i64 %.0810, -1
  %15 = add i64 %.011, %14
  %16 = load i64, ptr %0, align 8, !tbaa !5
  %17 = add nsw i64 %15, %16
  store i64 %17, ptr %0, align 8, !tbaa !5
  %18 = add nsw i64 %.0810, 1
  br label %19

19:                                               ; preds = %13, %11
  %.19 = phi i64 [ %.0810, %11 ], [ %18, %13 ]
  %.1 = phi i64 [ %12, %11 ], [ %.011, %13 ]
  %20 = load i64, ptr @N, align 8, !tbaa !5
  %21 = add nsw i64 %20, -1
  %22 = icmp slt i64 %.19, %21
  br i1 %22, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %19, %2
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt6vectorIdSaIdEEixEm(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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"double", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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