| /* Implementation of the MVBITS intrinsic |
| Copyright (C) 2004, 2006, 2009 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 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 |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* 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 int *, const int *, TYPE *, |
| const int *); |
| export_proto(SUB_NAME); |
| |
| void |
| SUB_NAME (const TYPE *from, const int *frompos, const int *len, TYPE *to, |
| const int *topos) |
| { |
| TYPE oldbits, newbits, lenmask; |
| |
| lenmask = (*len == sizeof (TYPE)*8) ? ~(TYPE)0 : ((TYPE)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 |