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 modf = __modf
31*25c28e83SPiotr Jasiukajtis #pragma weak _modf = __modf
32*25c28e83SPiotr Jasiukajtis
33*25c28e83SPiotr Jasiukajtis /*
34*25c28e83SPiotr Jasiukajtis * modf(x, iptr) decomposes x into an integral part and a fractional
35*25c28e83SPiotr Jasiukajtis * part both having the same sign as x. It stores the integral part
36*25c28e83SPiotr Jasiukajtis * in *iptr and returns the fractional part.
37*25c28e83SPiotr Jasiukajtis *
38*25c28e83SPiotr Jasiukajtis * If x is infinite, modf sets *iptr to x and returns copysign(0.0,x).
39*25c28e83SPiotr Jasiukajtis * If x is NaN, modf sets *iptr to x and returns x.
40*25c28e83SPiotr Jasiukajtis *
41*25c28e83SPiotr Jasiukajtis * If x is a signaling NaN, this code does not attempt to raise the
42*25c28e83SPiotr Jasiukajtis * invalid operation exception.
43*25c28e83SPiotr Jasiukajtis */
44*25c28e83SPiotr Jasiukajtis
45*25c28e83SPiotr Jasiukajtis #include "libm.h"
46*25c28e83SPiotr Jasiukajtis
47*25c28e83SPiotr Jasiukajtis double
__modf(double x,double * iptr)48*25c28e83SPiotr Jasiukajtis __modf(double x, double *iptr) {
49*25c28e83SPiotr Jasiukajtis union {
50*25c28e83SPiotr Jasiukajtis unsigned i[2];
51*25c28e83SPiotr Jasiukajtis double d;
52*25c28e83SPiotr Jasiukajtis } xx, yy;
53*25c28e83SPiotr Jasiukajtis unsigned hx, s;
54*25c28e83SPiotr Jasiukajtis
55*25c28e83SPiotr Jasiukajtis xx.d = x;
56*25c28e83SPiotr Jasiukajtis hx = xx.i[HIWORD] & ~0x80000000;
57*25c28e83SPiotr Jasiukajtis
58*25c28e83SPiotr Jasiukajtis if (hx >= 0x43300000) { /* x is NaN, infinite, or integral */
59*25c28e83SPiotr Jasiukajtis *iptr = x;
60*25c28e83SPiotr Jasiukajtis if (hx < 0x7ff00000 || (hx == 0x7ff00000 &&
61*25c28e83SPiotr Jasiukajtis xx.i[LOWORD] == 0)) {
62*25c28e83SPiotr Jasiukajtis xx.i[HIWORD] &= 0x80000000;
63*25c28e83SPiotr Jasiukajtis xx.i[LOWORD] = 0;
64*25c28e83SPiotr Jasiukajtis }
65*25c28e83SPiotr Jasiukajtis return (xx.d);
66*25c28e83SPiotr Jasiukajtis }
67*25c28e83SPiotr Jasiukajtis
68*25c28e83SPiotr Jasiukajtis if (hx < 0x3ff00000) { /* |x| < 1 */
69*25c28e83SPiotr Jasiukajtis xx.i[HIWORD] &= 0x80000000;
70*25c28e83SPiotr Jasiukajtis xx.i[LOWORD] = 0;
71*25c28e83SPiotr Jasiukajtis *iptr = xx.d;
72*25c28e83SPiotr Jasiukajtis return (x);
73*25c28e83SPiotr Jasiukajtis }
74*25c28e83SPiotr Jasiukajtis
75*25c28e83SPiotr Jasiukajtis /* split x at the binary point */
76*25c28e83SPiotr Jasiukajtis s = xx.i[HIWORD] & 0x80000000;
77*25c28e83SPiotr Jasiukajtis if (hx < 0x41400000) {
78*25c28e83SPiotr Jasiukajtis yy.i[HIWORD] = xx.i[HIWORD] & ~((1 << (0x413 - (hx >> 20))) -
79*25c28e83SPiotr Jasiukajtis 1);
80*25c28e83SPiotr Jasiukajtis yy.i[LOWORD] = 0;
81*25c28e83SPiotr Jasiukajtis } else {
82*25c28e83SPiotr Jasiukajtis yy.i[HIWORD] = xx.i[HIWORD];
83*25c28e83SPiotr Jasiukajtis yy.i[LOWORD] = xx.i[LOWORD] & ~((1 << (0x433 - (hx >> 20))) -
84*25c28e83SPiotr Jasiukajtis 1);
85*25c28e83SPiotr Jasiukajtis }
86*25c28e83SPiotr Jasiukajtis *iptr = yy.d;
87*25c28e83SPiotr Jasiukajtis xx.d -= yy.d;
88*25c28e83SPiotr Jasiukajtis xx.i[HIWORD] = (xx.i[HIWORD] & ~0x80000000) | s;
89*25c28e83SPiotr Jasiukajtis /* keep sign of x */
90*25c28e83SPiotr Jasiukajtis return (xx.d);
91*25c28e83SPiotr Jasiukajtis }
92