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 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