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jlechner |
/* Implementation of the MVBITS intrinsic
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Copyright (C) 2004, 2006 Free Software Foundation, Inc.
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Contributed by Tobias Schlüter
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This file is part of the GNU Fortran 95 runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with libgfortran; see the file COPYING. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/* TODO: This should be replaced by a compiler builtin. */
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#ifndef SUB_NAME
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#include <libgfortran.h>
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#endif
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#ifdef SUB_NAME
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/* MVBITS copies LEN bits starting at bit position FROMPOS from FROM
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into TO, starting at bit position TOPOS. */
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extern void SUB_NAME (const TYPE *, const GFC_INTEGER_4 *,
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const GFC_INTEGER_4 *, TYPE *, const GFC_INTEGER_4 *);
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export_proto(SUB_NAME);
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void
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SUB_NAME (const TYPE *from, const GFC_INTEGER_4 *frompos,
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const GFC_INTEGER_4 *len, TYPE *to, const GFC_INTEGER_4 *topos)
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{
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TYPE oldbits, newbits, lenmask;
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lenmask = (*len == sizeof (TYPE)*8) ? ~(TYPE)0 : ((TYPE)1 << *len) - 1;
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newbits = (((UTYPE)(*from) >> *frompos) & lenmask) << *topos;
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oldbits = *to & (~(lenmask << *topos));
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*to = newbits | oldbits;
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}
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#endif
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#ifndef SUB_NAME
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# define TYPE GFC_INTEGER_1
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# define UTYPE GFC_UINTEGER_1
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# define SUB_NAME mvbits_i1
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# include "mvbits.c"
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# undef SUB_NAME
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# undef TYPE
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# undef UTYPE
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# define TYPE GFC_INTEGER_2
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# define UTYPE GFC_UINTEGER_2
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# define SUB_NAME mvbits_i2
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# include "mvbits.c"
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# undef SUB_NAME
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# undef TYPE
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# undef UTYPE
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# define TYPE GFC_INTEGER_4
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# define UTYPE GFC_UINTEGER_4
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# define SUB_NAME mvbits_i4
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# include "mvbits.c"
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# undef SUB_NAME
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# undef TYPE
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# undef UTYPE
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# define TYPE GFC_INTEGER_8
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# define UTYPE GFC_UINTEGER_8
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# define SUB_NAME mvbits_i8
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# include "mvbits.c"
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# undef SUB_NAME
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# undef TYPE
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# undef UTYPE
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#endif
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