65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* Implementation of ishftc intrinsic.
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Copyright 2002 Free Software Foundation, Inc.
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Contributed by Paul Brook <paul@nowt.org>
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This file is part of the GNU Fortran 95 runtime library (libgfor).
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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 libgfor; 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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#include "libgfortran.h"
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#define ishftc4 prefix(ishftc4)
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GFC_INTEGER_4 ishftc4 (GFC_INTEGER_4, GFC_INTEGER_4, GFC_INTEGER_4);
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#define ishftc8 prefix(ishftc8)
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GFC_INTEGER_8 ishftc8 (GFC_INTEGER_8, GFC_INTEGER_8, GFC_INTEGER_8);
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GFC_INTEGER_4
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ishftc4 (GFC_INTEGER_4 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size)
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{
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GFC_INTEGER_4 mask;
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GFC_UINTEGER_4 bits;
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if (shift < 0)
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shift = shift + size;
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if (shift == 0 || shift == size)
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return i;
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mask = (~(GFC_INTEGER_4)0) << size;
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bits = i & ~mask;
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return (i & mask) | (bits >> (size - shift)) | ((i << shift) & ~mask);
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}
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GFC_INTEGER_8
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ishftc8 (GFC_INTEGER_8 i, GFC_INTEGER_8 shift, GFC_INTEGER_8 size)
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{
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GFC_INTEGER_8 mask;
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GFC_UINTEGER_8 bits;
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if (shift < 0)
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shift = shift + size;
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if (shift == 0 || shift == size)
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return i;
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mask = (~(GFC_INTEGER_8)0) << size;
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bits = i & ~mask;
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return (i & mask) | (bits >> (size - shift)) | ((i << shift) & ~mask);
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}
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