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! Copyright 2003, 2004, 2009 Free Software Foundation, Inc.
! Contributed by Kejia Zhao <>
!This file is part of the GNU Fortran 95 runtime library (libgfortran).
!Libgfortran is free software; you can redistribute it and/or
!modify it under the terms of the GNU General Public
!License as published by the Free Software Foundation; either
!version 3 of the License, or (at your option) any later version.
!Libgfortran is distributed in the hope that it will be useful,
!but WITHOUT ANY WARRANTY; without even the implied warranty of
!GNU General Public License for more details.
!Under Section 7 of GPL version 3, you are granted additional
!permissions described in the GCC Runtime Library Exception, version
!3.1, as published by the Free Software Foundation.
!You should have received a copy of the GNU General Public License and
!a copy of the GCC Runtime Library Exception along with this program;
!see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
function _gfortran_selected_real_kind (p, r)
implicit none
integer, optional, intent (in) :: p, r
integer :: _gfortran_selected_real_kind
integer :: i, p2, r2
logical :: found_p, found_r
! Real kind_precision_range table
type :: real_info
integer :: kind
integer :: precision
integer :: range
end type real_info
include ""
_gfortran_selected_real_kind = 0
p2 = 0
r2 = 0
found_p = .false.
found_r = .false.
if (present (p)) p2 = p
if (present (r)) r2 = r
! Assumes each type has a greater precision and range than previous one.
do i = 1, c
if (p2 <= real_infos (i) % precision) found_p = .true.
if (r2 <= real_infos (i) % range) found_r = .true.
if (found_p .and. found_r) then
_gfortran_selected_real_kind = real_infos (i) % kind
end if
end do
if (.not. (found_p)) _gfortran_selected_real_kind = _gfortran_selected_real_kind - 1
if (.not. (found_r)) _gfortran_selected_real_kind = _gfortran_selected_real_kind - 2
end function