72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/* Implementation of ishftc intrinsic.
|
|
Copyright 2002, 2004 Free Software Foundation, Inc.
|
|
Contributed by Paul Brook <paul@nowt.org>
|
|
|
|
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 2 of the License, or (at your option) any later version.
|
|
|
|
In addition to the permissions in the GNU General Public License, the
|
|
Free Software Foundation gives you unlimited permission to link the
|
|
compiled version of this file into combinations with other programs,
|
|
and to distribute those combinations without any restriction coming
|
|
from the use of this file. (The General Public License restrictions
|
|
do apply in other respects; for example, they cover modification of
|
|
the file, and distribution when not linked into a combine
|
|
executable.)
|
|
|
|
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.
|
|
|
|
You should have received a copy of the GNU General Public
|
|
License along with libgfortran; see the file COPYING. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include "libgfortran.h"
|
|
|
|
extern GFC_INTEGER_4 ishftc4 (GFC_INTEGER_4, GFC_INTEGER_4, GFC_INTEGER_4);
|
|
export_proto(ishftc4);
|
|
|
|
GFC_INTEGER_4
|
|
ishftc4 (GFC_INTEGER_4 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size)
|
|
{
|
|
GFC_INTEGER_4 mask;
|
|
GFC_UINTEGER_4 bits;
|
|
|
|
if (shift < 0)
|
|
shift = shift + size;
|
|
|
|
if (shift == 0 || shift == size)
|
|
return i;
|
|
|
|
mask = (~(GFC_INTEGER_4)0) << size;
|
|
bits = i & ~mask;
|
|
return (i & mask) | (bits >> (size - shift)) | ((i << shift) & ~mask);
|
|
}
|
|
|
|
extern GFC_INTEGER_8 ishftc8 (GFC_INTEGER_8, GFC_INTEGER_4, GFC_INTEGER_4);
|
|
export_proto(ishftc8);
|
|
|
|
GFC_INTEGER_8
|
|
ishftc8 (GFC_INTEGER_8 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size)
|
|
{
|
|
GFC_INTEGER_8 mask;
|
|
GFC_UINTEGER_8 bits;
|
|
|
|
if (shift < 0)
|
|
shift = shift + size;
|
|
|
|
if (shift == 0 || shift == size)
|
|
return i;
|
|
|
|
mask = (~(GFC_INTEGER_8)0) << size;
|
|
bits = i & ~mask;
|
|
return (i & mask) | (bits >> (size - shift)) | ((i << shift) & ~mask);
|
|
}
|