1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
24 */
25/*
26 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
27 * Use is subject to license terms.
28 */
29
30#pragma weak __lroundf = lroundf
31
32#include <sys/isa_defs.h>	/* _ILP32 */
33#include "libm.h"
34
35#if defined(_ILP32)
36long
37lroundf(float x) {
38	union {
39		unsigned i;
40		float f;
41	} xx;
42	unsigned hx, sx, i;
43
44	xx.f = x;
45	hx = xx.i & ~0x80000000;
46	sx = xx.i & 0x80000000;
47	if (hx < 0x4b000000) {		/* |x| < 2^23 */
48		if (hx < 0x3f800000) {		/* |x| < 1 */
49			if (hx >= 0x3f000000)
50				return (sx ? -1L : 1L);
51			return (0L);
52		}
53
54		/* round x at the integer bit */
55		i = 1 << (0x95 - (hx >> 23));
56		xx.i = (xx.i + i) & ~((i << 1) - 1);
57		return ((long) xx.f);
58	}
59
60	/* now x is nan, inf, or integral */
61	return ((long) x);
62}
63#else
64#error Unsupported architecture
65#endif	/* defined(_ILP32) */
66