1/*	$NetBSD: flt_rounds.c,v 1.10 2005/12/24 23:10:08 perry Exp $	*/
2
3/*
4 * Copyright (c) 1996 Mark Brinicombe
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *      This product includes software developed by Mark Brinicombe
18 *	for the NetBSD Project.
19 * 4. The name of the author may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35#if defined(LIBC_SCCS) && !defined(lint)
36__RCSID("$NetBSD: flt_rounds.c,v 1.10 2005/12/24 23:10:08 perry Exp $");
37#endif /* LIBC_SCCS and not lint */
38
39#include <ieeefp.h>
40#include <float.h>
41#include <stdint.h>
42#include <powerpc/fpu.h>
43
44static const int map[] = {
45	1,	/* round to nearest */
46	0,	/* round to zero */
47	2,	/* round to positive infinity */
48	3	/* round to negative infinity */
49};
50
51int
52__flt_rounds(void)
53{
54#ifdef _SOFT_FLOAT
55	return map[fpgetround()];
56#else
57	uint64_t fpscr;
58
59	__asm volatile("mffs %0" : "=f"(fpscr));
60	return map[((uint32_t)fpscr & FPSCR_RN)];
61#endif
62}
63