1ee3acfb08
2004-10-04 Andrew Pinski <pinskia@physics.uc.edu>
* intrinsics/mvbits.c: Commit the file.
From-SVN: r88541
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/* Implementation of the MVBITS intrinsic
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Copyright (C) 2004 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with libgfortran; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, 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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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 : (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_4
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# define UTYPE GFC_UINTEGER_4
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# define SUB_NAME prefix (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 prefix (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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