libgfortran/intrinsics/selected_real_kind.f90

   1 !   Copyright (C) 2003-2020 Free Software Foundation, Inc.
   2 !   Contributed by Kejia Zhao <kejia_zh@yahoo.com.cn>
   3 !
   4 !This file is part of the GNU Fortran runtime library (libgfortran).
   5 !
   6 !Libgfortran is free software; you can redistribute it and/or
   7 !modify it under the terms of the GNU General Public
   8 !License as published by the Free Software Foundation; either
   9 !version 3 of the License, or (at your option) any later version.
  10 !
  11 !Libgfortran is distributed in the hope that it will be useful,
  12 !but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 !MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 !GNU General Public License for more details.
  15 !
  16 !Under Section 7 of GPL version 3, you are granted additional
  17 !permissions described in the GCC Runtime Library Exception, version
  18 !3.1, as published by the Free Software Foundation.
  19 !
  20 !You should have received a copy of the GNU General Public License and
  21 !a copy of the GCC Runtime Library Exception along with this program;
  22 !see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 !<http://www.gnu.org/licenses/>.
  24
  25 function _gfortran_selected_real_kind2008 (p, r, rdx)
  26   implicit none
  27   integer, optional, intent (in) :: p, r, rdx
  28   integer :: _gfortran_selected_real_kind2008
  29   integer :: i, p2, r2, radix2
  30   logical :: found_p, found_r, found_radix
  31   ! Real kind_precision_range table
  32   type :: real_info
  33     integer :: kind
  34     integer :: precision
  35     integer :: range
  36     integer :: radix
  37   end type real_info
  38
  39   include "selected_real_kind.inc"
  40
  41   _gfortran_selected_real_kind2008 = 0
  42   p2 = 0
  43   r2 = 0
  44   radix2 = 0
  45   found_p = .false.
  46   found_r = .false.
  47   found_radix = .false.
  48
  49   if (present (p)) p2 = p
  50   if (present (r)) r2 = r
  51   if (present (rdx)) radix2 = rdx
  52
  53   ! Assumes each type has a greater precision and range than previous one.
  54
  55   do i = 1, c
  56     if (p2 <= real_infos (i) % precision) found_p = .true.
  57     if (r2 <= real_infos (i) % range) found_r = .true.
  58     if (radix2 <= real_infos (i) % radix) found_radix = .true.
  59
  60     if (p2 <= real_infos (i) % precision   &
  61         .and. r2 <= real_infos (i) % range &
  62         .and. radix2 <= real_infos (i) % radix) then
  63       _gfortran_selected_real_kind2008 = real_infos (i) % kind
  64       return
  65     end if
  66   end do
  67
  68   if (found_radix .and. found_r .and. .not. found_p) then
  69     _gfortran_selected_real_kind2008 = -1
  70   elseif (found_radix .and. found_p .and. .not. found_r) then
  71     _gfortran_selected_real_kind2008 = -2
  72   elseif (found_radix .and. .not. found_p .and. .not. found_r) then
  73     _gfortran_selected_real_kind2008 = -3
  74   elseif (found_radix) then
  75     _gfortran_selected_real_kind2008 = -4
  76   else
  77     _gfortran_selected_real_kind2008 = -5
  78   end if
  79 end function _gfortran_selected_real_kind2008
  80
  81 function _gfortran_selected_real_kind (p, r)
  82   implicit none
  83   integer, optional, intent (in) :: p, r
  84   integer :: _gfortran_selected_real_kind
  85
  86   interface
  87     function _gfortran_selected_real_kind2008 (p, r, rdx)
  88       implicit none
  89       integer, optional, intent (in) :: p, r, rdx
  90       integer :: _gfortran_selected_real_kind2008
  91     end function _gfortran_selected_real_kind2008
  92   end interface
  93
  94   _gfortran_selected_real_kind = _gfortran_selected_real_kind2008 (p, r)
  95 end function