mvbits.c: Commit the file.

2004-10-04  Andrew Pinski  <pinskia@physics.uc.edu>

        * intrinsics/mvbits.c: Commit the file.

From-SVN: r88541

libgfortran/ChangeLog

+2004-10-04  Andrew Pinski  <pinskia@physics.uc.edu>
+
+	* intrinsics/mvbits.c: Commit the file.
+
 2004-10-04  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>
 
 	PR fortran/17283

libgfortran/intrinsics/mvbits.c

+/* Implementation of the MVBITS intrinsic
+   Copyright (C) 2004 Free Software Foundation, Inc.
+   Contributed by Tobias Schlüter
+
+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 Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with libgfortran; see the file COPYING.LIB.  If not,
+write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* TODO: This should be replaced by a compiler builtin.  */
+
+#ifndef SUB_NAME
+#include <libgfortran.h>
+#endif
+
+#ifdef SUB_NAME
+/* MVBITS copies LEN bits starting at bit position FROMPOS from FROM
+   into TO, starting at bit position TOPOS.  */
+
+void 
+SUB_NAME (const TYPE *from, const GFC_INTEGER_4 *frompos,
+          const GFC_INTEGER_4 *len, TYPE *to, const GFC_INTEGER_4 *topos)
+{
+  TYPE oldbits, newbits, lenmask;
+
+  lenmask = (*len == sizeof (TYPE)*8) ? ~(TYPE)0 : (1 << *len) - 1;
+  newbits = (((UTYPE)(*from) >> *frompos) & lenmask) << *topos;
+  oldbits = *to & (~(lenmask << *topos));
+
+  *to = newbits | oldbits;
+}
+#endif
+
+#ifndef SUB_NAME
+#  define TYPE GFC_INTEGER_4
+#  define UTYPE GFC_UINTEGER_4
+#  define SUB_NAME prefix (mvbits_i4)
+#  include "mvbits.c"
+#  undef SUB_NAME
+#  undef TYPE
+#  undef UTYPE
+
+#  define TYPE GFC_INTEGER_8
+#  define UTYPE GFC_UINTEGER_8
+#  define SUB_NAME prefix (mvbits_i8)
+#  include "mvbits.c"
+#  undef SUB_NAME
+#  undef TYPE
+#  undef UTYPE
+#endif
+