/*-
 * Copyright (c) 1992 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.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ashrdi3.c	5.6 (Berkeley) 06/21/92";
#endif /* LIBC_SCCS and not lint */

#include "quad.h"

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

	aa.q = a;
	if (shift >= LONG_BITS) {
		long 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
		 * LONG_BITS is undefined, so we shift (LONG_BITS-1),
		 * then 1 more, to get our answer.
		 */
		s = (aa.sl[H] >> (LONG_BITS - 1)) >> 1;
		aa.ul[L] = shift >= QUAD_BITS ? s :
		    aa.sl[H] >> (shift - LONG_BITS);
		aa.ul[H] = s;
	} else if (shift > 0) {
		aa.ul[L] = (aa.ul[L] >> shift) |
		    (aa.ul[H] << (LONG_BITS - shift));
		aa.sl[H] >>= shift;
	}
	return (aa.q);
}