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Diffstat (limited to 'libgfortran/intrinsics/selected_real_kind.f90')
| -rw-r--r-- | libgfortran/intrinsics/selected_real_kind.f90 | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/libgfortran/intrinsics/selected_real_kind.f90 b/libgfortran/intrinsics/selected_real_kind.f90 new file mode 100644 index 00000000000..df2881717cd --- /dev/null +++ b/libgfortran/intrinsics/selected_real_kind.f90 @@ -0,0 +1,61 @@ +! Copyright 2003, 2004 Free Software Foundation, Inc. +! Contributed by Kejia Zhao <kejia_zh@yahoo.com.cn> +! +!This file is part of the GNU Fortran 95 runtime library (libgfor). +! +!GNU libgfor is free software; you can redistribute it and/or +!modify it under the terms of the GNU Lesser General Public +!License as published by the Free Software Foundation; either +!version 2.1 of the License, or (at your option) any later version. +! +!GNU libgfor is distributed in the hope that it will be useful, +!but WITHOUT ANY WARRANTY; without even the implied warranty of +!MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +!GNU Lesser General Public License for more details. +! +!You should have received a copy of the GNU Lesser General Public +!License along with libgfor; see the file COPYING. If not, +!write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +!Boston, MA 02111-1307, USA. +! + +function selected_real_kind (p, r) + implicit none + integer, optional, intent (in) :: p, r + integer :: 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 "selected_real_kind.inc" + + 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 + selected_real_kind = real_infos (i) % kind + return + end if + end do + + if (.not. (found_p)) selected_real_kind = selected_real_kind - 1 + if (.not. (found_r)) selected_real_kind = selected_real_kind - 2 + + return +end function |