| /* Implementation of the MVBITS intrinsic |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| Contributed by Tobias Schlüter |
| |
| 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 2 of the License, or (at your option) any later version. |
| |
| In addition to the permissions in the GNU General Public License, the |
| Free Software Foundation gives you unlimited permission to link the |
| compiled version of this file into combinations with other programs, |
| and to distribute those combinations without any restriction coming |
| from the use of this file. (The General Public License restrictions |
| do apply in other respects; for example, they cover modification of |
| the file, and distribution when not linked into a combine |
| executable.) |
| |
| Libgfortran 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public |
| License along with libgfortran; see the file COPYING. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| /* TODO: This should be replaced by a compiler builtin. */ |
| |
| #ifndef SUB_NAME |
| #include <libgfortran.h> |
| #endif |
| |
| #ifdef SUB_NAME |
| /* MVBITS copies LEN bits starting at bit position FROMPOS from FROM |
| into TO, starting at bit position TOPOS. */ |
| |
| extern void SUB_NAME (const TYPE *, const GFC_INTEGER_4 *, |
| const GFC_INTEGER_4 *, TYPE *, const GFC_INTEGER_4 *); |
| export_proto(SUB_NAME); |
| |
| void |
| SUB_NAME (const TYPE *from, const GFC_INTEGER_4 *frompos, |
| const GFC_INTEGER_4 *len, TYPE *to, const GFC_INTEGER_4 *topos) |
| { |
| TYPE oldbits, newbits, lenmask; |
| |
| lenmask = (*len == sizeof (TYPE)*8) ? ~(TYPE)0 : (1 << *len) - 1; |
| newbits = (((UTYPE)(*from) >> *frompos) & lenmask) << *topos; |
| oldbits = *to & (~(lenmask << *topos)); |
| |
| *to = newbits | oldbits; |
| } |
| #endif |
| |
| #ifndef SUB_NAME |
| # define TYPE GFC_INTEGER_1 |
| # define UTYPE GFC_UINTEGER_1 |
| # define SUB_NAME mvbits_i1 |
| # include "mvbits.c" |
| # undef SUB_NAME |
| # undef TYPE |
| # undef UTYPE |
| |
| # define TYPE GFC_INTEGER_2 |
| # define UTYPE GFC_UINTEGER_2 |
| # define SUB_NAME mvbits_i2 |
| # include "mvbits.c" |
| # undef SUB_NAME |
| # undef TYPE |
| # undef UTYPE |
| |
| # define TYPE GFC_INTEGER_4 |
| # define UTYPE GFC_UINTEGER_4 |
| # define SUB_NAME mvbits_i4 |
| # include "mvbits.c" |
| # undef SUB_NAME |
| # undef TYPE |
| # undef UTYPE |
| |
| # define TYPE GFC_INTEGER_8 |
| # define UTYPE GFC_UINTEGER_8 |
| # define SUB_NAME mvbits_i8 |
| # include "mvbits.c" |
| # undef SUB_NAME |
| # undef TYPE |
| # undef UTYPE |
| #endif |