/*      $NetBSD: ashrdi3.c,v 1.4 2012/08/06 02:31:54 matt Exp $ */

/*-
* Copyright (c) 1992, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)ashrdi3.c   8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: ashrdi3.c,v 1.4 2012/08/06 02:31:54 matt Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include "quad.h"

ARM_EABI_ALIAS(__aeabi_lasr, __ashrdi3) /* no semicolon */

/*
* Shift a (signed) quad value right (arithmetic shift right).
*/
quad_t
__ashrdi3(quad_t a, qshift_t shift)
{
       union uu aa;

       if (shift == 0)
               return(a);
       aa.q = a;
       if (shift >= INT_BITS) {
               int s;

               /*
                * Smear bits rightward using the machine's right-shift
                * method, whether that is sign extension or zero fill,
                * to get the `sign word' s.  Note that shifting by
                * INT_BITS is undefined, so we shift (INT_BITS-1),
                * then 1 more, to get our answer.
                */
               /* LINTED inherits machine dependency */
               s = (aa.sl[H] >> (INT_BITS - 1)) >> 1;
               /* LINTED inherits machine dependency*/
               aa.ul[L] = aa.sl[H] >> (shift - INT_BITS);
               aa.ul[H] = s;
       } else {
               aa.ul[L] = (aa.ul[L] >> shift) |
                   (aa.ul[H] << (unsigned int)(INT_BITS - shift));
               /* LINTED inherits machine dependency */
               aa.sl[H] >>= shift;
       }
       return (aa.q);
}