1/*	$OpenBSD: fpsetround.c,v 1.3 2014/04/18 15:09:52 guenther Exp $	*/
2/*
3 * Copyright (c) 2006 Miodrag Vallat.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice, this permission notice, and the disclaimer below
8 * appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/types.h>
20#include <ieeefp.h>
21
22fp_rnd
23fpsetround(fp_rnd rnd_dir)
24{
25	register_t fpscr, nfpscr;
26#if defined(__SH4__) && !defined(__SH4_NOFPU__)
27	extern register_t __fpscr_values[2];
28#endif
29
30	__asm__ volatile ("sts fpscr, %0" : "=r" (fpscr));
31	if (rnd_dir == FP_RN || rnd_dir == FP_RZ) {
32		nfpscr = (fpscr & ~0x03) | rnd_dir;
33#if defined(__SH4__) && !defined(__SH4_NOFPU__)
34		__fpscr_values[0] = (__fpscr_values[0] & ~0x03) | rnd_dir;
35		__fpscr_values[1] = (__fpscr_values[1] & ~0x03) | rnd_dir;
36#endif
37		__asm__ volatile ("lds %0, fpscr" : : "r" (nfpscr));
38	}
39	/* else how report an error? */
40
41	return (fpscr & 0x03);
42}
43