; LLVM IR from tangjz/acm-icpc :: lydsy/2645.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"

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

@m = external dso_local global i32, align 4
@c = external dso_local global [4001 x i32], align 16
@st = external dso_local global i32, align 4
@P = external dso_local global ptr, align 8
@F = external dso_local global ptr, align 8
@e = external dso_local global [4001 x %"class.std::vector"], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %5 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #5
  %11 = load ptr, ptr @F, align 8, !tbaa !9
  %12 = load i32, ptr @st, align 4, !tbaa !5
  %13 = load ptr, ptr @P, align 8, !tbaa !9
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds i32, ptr %13, i64 %15
  store i32 %12, ptr %16, align 4, !tbaa !5
  %17 = sext i32 %12 to i64
  %18 = getelementptr inbounds i32, ptr %11, i64 %17
  store ptr %18, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #5
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [4001 x %"class.std::vector"], ptr @e, i64 0, i64 %20
  %22 = call ptr @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %21) #5
  %23 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %4, i32 0, i32 0
  store ptr %22, ptr %23, align 8
  br label %24

24:                                               ; preds = %73, %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  %25 = load i32, ptr %2, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [4001 x %"class.std::vector"], ptr @e, i64 0, i64 %26
  %28 = call ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %27) #5
  %29 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %5, i32 0, i32 0
  store ptr %28, ptr %29, align 8
  %30 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %4, ptr noundef nonnull align 8 dereferenceable(8) %5) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  br i1 %30, label %32, label %31

31:                                               ; preds = %24
  store i32 2, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #5
  br label %75

32:                                               ; preds = %24
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #5
  %33 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %4) #5
  %34 = load i32, ptr %33, align 4, !tbaa !5
  store i32 %34, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #5
  %35 = load ptr, ptr @F, align 8, !tbaa !9
  %36 = load i32, ptr @m, align 4, !tbaa !5
  %37 = load i32, ptr @st, align 4, !tbaa !5
  %38 = add nsw i32 %37, %36
  store i32 %38, ptr @st, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds i32, ptr %35, i64 %39
  store ptr %40, ptr %8, align 8, !tbaa !9
  %41 = load ptr, ptr %8, align 8, !tbaa !9
  %42 = load ptr, ptr %3, align 8, !tbaa !9
  %43 = load i32, ptr @m, align 4, !tbaa !5
  %44 = sext i32 %43 to i64
  %45 = mul i64 %44, 4
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %41, ptr align 4 %42, i64 %45, i1 false)
  %46 = load i32, ptr %7, align 4, !tbaa !5
  call void @_Z3dfsi(i32 noundef %46)
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #5
  store i32 1, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #5
  %47 = load i32, ptr %7, align 4, !tbaa !5
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds [4001 x i32], ptr @c, i64 0, i64 %48
  %50 = load i32, ptr %49, align 4, !tbaa !5
  store i32 %50, ptr %10, align 4, !tbaa !5
  br label %51

51:                                               ; preds = %69, %32
  %52 = load i32, ptr %9, align 4, !tbaa !5
  %53 = load i32, ptr @m, align 4, !tbaa !5
  %54 = icmp slt i32 %52, %53
  br i1 %54, label %56, label %55

55:                                               ; preds = %51
  store i32 5, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #5
  br label %72

56:                                               ; preds = %51
  %57 = load ptr, ptr %3, align 8, !tbaa !9
  %58 = load i32, ptr %9, align 4, !tbaa !5
  %59 = sext i32 %58 to i64
  %60 = getelementptr inbounds i32, ptr %57, i64 %59
  %61 = load ptr, ptr %8, align 8, !tbaa !9
  %62 = load i32, ptr %9, align 4, !tbaa !5
  %63 = sub nsw i32 %62, 1
  %64 = sext i32 %63 to i64
  %65 = getelementptr inbounds i32, ptr %61, i64 %64
  %66 = load i32, ptr %65, align 4, !tbaa !5
  %67 = load i32, ptr %10, align 4, !tbaa !5
  %68 = add nsw i32 %66, %67
  call void @_Z3updRii(ptr noundef nonnull align 4 dereferenceable(4) %60, i32 noundef %68)
  br label %69

69:                                               ; preds = %56
  %70 = load i32, ptr %9, align 4, !tbaa !5
  %71 = add nsw i32 %70, 1
  store i32 %71, ptr %9, align 4, !tbaa !5
  br label %51, !llvm.loop !11

72:                                               ; preds = %55
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #5
  br label %73

73:                                               ; preds = %72
  %74 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %4) #5
  br label %24, !llvm.loop !13

75:                                               ; preds = %31
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #5
  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 ptr @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #3

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #4

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_Z3updRii(ptr noundef nonnull align 4 dereferenceable(4), i32 noundef) #3

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEppEv(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

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 = { 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 #4 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #5 = { 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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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<int, std::allocator<int>>::_Vector_impl" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.__gnu_cxx::__normal_iterator" = type { ptr }

@m = external dso_local local_unnamed_addr global i32, align 4
@c = external dso_local local_unnamed_addr global [4001 x i32], align 16
@st = external dso_local local_unnamed_addr global i32, align 4
@P = external dso_local local_unnamed_addr global ptr, align 8
@F = external dso_local local_unnamed_addr global ptr, align 8
@e = external dso_local global [4001 x %"class.std::vector"], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3dfsi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %3 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %4 = load ptr, ptr @F, align 8, !tbaa !5
  %5 = load i32, ptr @st, align 4, !tbaa !9
  %6 = load ptr, ptr @P, align 8, !tbaa !5
  %7 = sext i32 %0 to i64
  %8 = getelementptr inbounds i32, ptr %6, i64 %7
  store i32 %5, ptr %8, align 4, !tbaa !9
  %9 = sext i32 %5 to i64
  %10 = getelementptr inbounds i32, ptr %4, i64 %9
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #4
  %11 = getelementptr inbounds [4001 x %"class.std::vector"], ptr @e, i64 0, i64 %7
  %12 = tail call ptr @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %11) #4
  store ptr %12, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #4
  %13 = tail call ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %11) #4
  store ptr %13, ptr %3, align 8
  %14 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #4
  br i1 %14, label %.lr.ph15, label %._crit_edge16

._crit_edge16:                                    ; preds = %._crit_edge, %1
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #4
  ret void

.lr.ph15:                                         ; preds = %1, %._crit_edge
  %15 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %2) #4
  %16 = load i32, ptr %15, align 4, !tbaa !9
  %17 = load ptr, ptr @F, align 8, !tbaa !5
  %18 = load i32, ptr @m, align 4, !tbaa !9
  %19 = load i32, ptr @st, align 4, !tbaa !9
  %20 = add nsw i32 %19, %18
  store i32 %20, ptr @st, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds i32, ptr %17, i64 %21
  %23 = sext i32 %18 to i64
  %24 = shl nsw i64 %23, 2
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %22, ptr align 4 %10, i64 %24, i1 false)
  call void @_Z3dfsi(i32 noundef %16)
  %25 = sext i32 %16 to i64
  %26 = getelementptr inbounds [4001 x i32], ptr @c, i64 0, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !9
  %invariant.gep = getelementptr i8, ptr %22, i64 -4
  %28 = load i32, ptr @m, align 4, !tbaa !9
  %29 = icmp sgt i32 %28, 1
  br i1 %29, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %.lr.ph15
  %30 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %2) #4
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #4
  %31 = call ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %11) #4
  store ptr %31, ptr %3, align 8
  %32 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #4
  br i1 %32, label %.lr.ph15, label %._crit_edge16, !llvm.loop !11

.lr.ph:                                           ; preds = %.lr.ph15, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 1, %.lr.ph15 ]
  %33 = getelementptr inbounds i32, ptr %10, i64 %indvars.iv
  %gep = getelementptr i32, ptr %invariant.gep, i64 %indvars.iv
  %34 = load i32, ptr %gep, align 4, !tbaa !9
  %35 = add nsw i32 %34, %27
  call void @_Z3updRii(ptr noundef nonnull align 4 dereferenceable(4) %33, i32 noundef %35)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %36 = load i32, ptr @m, align 4, !tbaa !9
  %37 = sext i32 %36 to i64
  %38 = icmp slt i64 %indvars.iv.next, %37
  br i1 %38, label %.lr.ph, label %._crit_edge, !llvm.loop !13
}

; Function Attrs: mustprogress 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 ptr @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_Z3updRii(ptr noundef nonnull align 4 dereferenceable(4), i32 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEppEv(ptr noundef nonnull align 8 dereferenceable(8)) 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 = { mustprogress 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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { 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 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


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