1*25c28e83SPiotr Jasiukajtis /*
2*25c28e83SPiotr Jasiukajtis * CDDL HEADER START
3*25c28e83SPiotr Jasiukajtis *
4*25c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the
5*25c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License").
6*25c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License.
7*25c28e83SPiotr Jasiukajtis *
8*25c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9*25c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing.
10*25c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions
11*25c28e83SPiotr Jasiukajtis * and limitations under the License.
12*25c28e83SPiotr Jasiukajtis *
13*25c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each
14*25c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15*25c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the
16*25c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying
17*25c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner]
18*25c28e83SPiotr Jasiukajtis *
19*25c28e83SPiotr Jasiukajtis * CDDL HEADER END
20*25c28e83SPiotr Jasiukajtis */
21*25c28e83SPiotr Jasiukajtis
22*25c28e83SPiotr Jasiukajtis /*
23*25c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
24*25c28e83SPiotr Jasiukajtis */
25*25c28e83SPiotr Jasiukajtis /*
26*25c28e83SPiotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
27*25c28e83SPiotr Jasiukajtis * Use is subject to license terms.
28*25c28e83SPiotr Jasiukajtis */
29*25c28e83SPiotr Jasiukajtis
30*25c28e83SPiotr Jasiukajtis #pragma weak modff = __modff
31*25c28e83SPiotr Jasiukajtis #pragma weak _modff = __modff
32*25c28e83SPiotr Jasiukajtis
33*25c28e83SPiotr Jasiukajtis #include "libm.h"
34*25c28e83SPiotr Jasiukajtis
35*25c28e83SPiotr Jasiukajtis float
__modff(float x,float * iptr)36*25c28e83SPiotr Jasiukajtis __modff(float x, float *iptr) {
37*25c28e83SPiotr Jasiukajtis union {
38*25c28e83SPiotr Jasiukajtis unsigned i;
39*25c28e83SPiotr Jasiukajtis float f;
40*25c28e83SPiotr Jasiukajtis } xx, yy;
41*25c28e83SPiotr Jasiukajtis unsigned hx, s;
42*25c28e83SPiotr Jasiukajtis
43*25c28e83SPiotr Jasiukajtis xx.f = x;
44*25c28e83SPiotr Jasiukajtis hx = xx.i & ~0x80000000;
45*25c28e83SPiotr Jasiukajtis
46*25c28e83SPiotr Jasiukajtis if (hx >= 0x4b000000) { /* x is NaN, infinite, or integral */
47*25c28e83SPiotr Jasiukajtis *iptr = x;
48*25c28e83SPiotr Jasiukajtis if (hx <= 0x7f800000)
49*25c28e83SPiotr Jasiukajtis xx.i &= 0x80000000;
50*25c28e83SPiotr Jasiukajtis return (xx.f);
51*25c28e83SPiotr Jasiukajtis }
52*25c28e83SPiotr Jasiukajtis
53*25c28e83SPiotr Jasiukajtis if (hx < 0x3f800000) { /* |x| < 1 */
54*25c28e83SPiotr Jasiukajtis xx.i &= 0x80000000;
55*25c28e83SPiotr Jasiukajtis *iptr = xx.f;
56*25c28e83SPiotr Jasiukajtis return (x);
57*25c28e83SPiotr Jasiukajtis }
58*25c28e83SPiotr Jasiukajtis
59*25c28e83SPiotr Jasiukajtis /* split x at the binary point */
60*25c28e83SPiotr Jasiukajtis s = xx.i & 0x80000000;
61*25c28e83SPiotr Jasiukajtis yy.i = xx.i & ~((1 << (0x96 - (hx >> 23))) - 1);
62*25c28e83SPiotr Jasiukajtis *iptr = yy.f;
63*25c28e83SPiotr Jasiukajtis xx.f -= yy.f;
64*25c28e83SPiotr Jasiukajtis xx.i = (xx.i & ~0x80000000) | s;
65*25c28e83SPiotr Jasiukajtis /* restore sign in case difference is 0 */
66*25c28e83SPiotr Jasiukajtis return (xx.f);
67*25c28e83SPiotr Jasiukajtis }
68