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71d90ac4 | 1 | /* Implementation of the SPACING intrinsic |
f1717362 | 2 | Copyright (C) 2006-2016 Free Software Foundation, Inc. |
71d90ac4 | 3 | Contributed by Steven G. Kargl <kargl@gcc.gnu.org> |
4 | ||
5 | This file is part of the GNU Fortran 95 runtime library (libgfortran). | |
6 | ||
7 | Libgfortran is free software; you can redistribute it and/or | |
8 | modify it under the terms of the GNU General Public | |
9 | License as published by the Free Software Foundation; either | |
6bc9506f | 10 | version 3 of the License, or (at your option) any later version. |
71d90ac4 | 11 | |
12 | Libgfortran is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
6bc9506f | 17 | Under Section 7 of GPL version 3, you are granted additional |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
71d90ac4 | 25 | |
71d90ac4 | 26 | #include "libgfortran.h" |
27 | ||
28 | ||
9dc59fdf | 29 | |
30 | #if defined(GFC_REAL_16_IS_FLOAT128) | |
31 | #define MATHFUNC(funcname) funcname ## q | |
32 | #else | |
33 | #define MATHFUNC(funcname) funcname ## l | |
34 | #endif | |
35 | ||
87969c8c | 36 | #if defined (HAVE_GFC_REAL_16) && (defined(GFC_REAL_16_IS_FLOAT128) || defined(HAVE_FREXPL)) |
71d90ac4 | 37 | |
38 | extern GFC_REAL_16 spacing_r16 (GFC_REAL_16 s, int p, int emin, GFC_REAL_16 tiny); | |
39 | export_proto(spacing_r16); | |
40 | ||
41 | GFC_REAL_16 | |
42 | spacing_r16 (GFC_REAL_16 s, int p, int emin, GFC_REAL_16 tiny) | |
43 | { | |
44 | int e; | |
45 | if (s == 0.) | |
46 | return tiny; | |
9dc59fdf | 47 | MATHFUNC(frexp) (s, &e); |
71d90ac4 | 48 | e = e - p; |
49 | e = e > emin ? e : emin; | |
87969c8c | 50 | #if (defined(GFC_REAL_16_IS_FLOAT128) || defined(HAVE_LDEXPL)) |
9dc59fdf | 51 | return MATHFUNC(ldexp) (1., e); |
bd73b228 | 52 | #else |
9dc59fdf | 53 | return MATHFUNC(scalbn) (1., e); |
bd73b228 | 54 | #endif |
71d90ac4 | 55 | } |
56 | ||
57 | #endif |