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 __llroundf = llroundf
31 #if defined(__sparcv9) || defined(__amd64)
32 #pragma weak lroundf = llroundf
33 #pragma weak __lroundf = llroundf
34 #endif
35
36 #include "libm.h"
37
38 long long
llroundf(float x)39 llroundf(float x) {
40 union {
41 unsigned i;
42 float f;
43 } xx;
44 unsigned hx, sx, i;
45
46 xx.f = x;
47 hx = xx.i & ~0x80000000;
48 sx = xx.i & 0x80000000;
49
50 if (hx < 0x4b000000) { /* |x| < 2^23 */
51 /* handle |x| < 1 */
52 if (hx < 0x3f800000) {
53 if (hx >= 0x3f000000)
54 return (sx ? -1LL : 1LL);
55 return (0LL);
56 }
57
58 /* round x at the integer bit */
59 i = 1 << (0x95 - (hx >> 23));
60 xx.i = (xx.i + i) & ~((i << 1) - 1);
61
62 /*
63 * on LP32 architectures, we can just convert x to a 32-bit
64 * integer and sign-extend it
65 */
66 return ((long) xx.f);
67 }
68
69 /* now x is nan, inf, or integral */
70 return ((long long) x);
71 }
72