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jeremybenn |
/* Implementation of the MVBITS intrinsic
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Copyright (C) 2004, 2006, 2009 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 3 of the License, or (at your option) any later version.
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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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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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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 int *, const int *, TYPE *,
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const int *);
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export_proto(SUB_NAME);
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void
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SUB_NAME (const TYPE *from, const int *frompos, const int *len, TYPE *to,
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const int *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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