125c28e83SPiotr Jasiukajtis /* 225c28e83SPiotr Jasiukajtis * CDDL HEADER START 325c28e83SPiotr Jasiukajtis * 425c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 525c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 625c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 725c28e83SPiotr Jasiukajtis * 825c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 925c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 1025c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions 1125c28e83SPiotr Jasiukajtis * and limitations under the License. 1225c28e83SPiotr Jasiukajtis * 1325c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 1425c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 1525c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 1625c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 1725c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 1825c28e83SPiotr Jasiukajtis * 1925c28e83SPiotr Jasiukajtis * CDDL HEADER END 2025c28e83SPiotr Jasiukajtis */ 2125c28e83SPiotr Jasiukajtis /* 2225c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 2325c28e83SPiotr Jasiukajtis */ 2425c28e83SPiotr Jasiukajtis /* 2525c28e83SPiotr Jasiukajtis * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 2625c28e83SPiotr Jasiukajtis * Use is subject to license terms. 2725c28e83SPiotr Jasiukajtis */ 2825c28e83SPiotr Jasiukajtis 29*ddc0e0b5SRichard Lowe #pragma weak __log1pf = log1pf 3025c28e83SPiotr Jasiukajtis 3125c28e83SPiotr Jasiukajtis #include "libm.h" 3225c28e83SPiotr Jasiukajtis 3325c28e83SPiotr Jasiukajtis static const float zero = 0.0f; 3425c28e83SPiotr Jasiukajtis 3525c28e83SPiotr Jasiukajtis float 3625c28e83SPiotr Jasiukajtis log1pf(float x) { 3725c28e83SPiotr Jasiukajtis int ix; 3825c28e83SPiotr Jasiukajtis 3925c28e83SPiotr Jasiukajtis ix = *(int *)&x; 4025c28e83SPiotr Jasiukajtis if (ix >= 0x7f800000) { 4125c28e83SPiotr Jasiukajtis /* x is +inf or nan */ 4225c28e83SPiotr Jasiukajtis return (x * x); 4325c28e83SPiotr Jasiukajtis } 4425c28e83SPiotr Jasiukajtis if (ix < 0) { 4525c28e83SPiotr Jasiukajtis ix &= ~0x80000000; 4625c28e83SPiotr Jasiukajtis if (ix == 0x3f800000) /* x is -1 */ 4725c28e83SPiotr Jasiukajtis return (x / zero); 4825c28e83SPiotr Jasiukajtis if (ix > 0x3f800000) /* x is < -1 or nan */ 4925c28e83SPiotr Jasiukajtis return ((x * zero) / zero); 5025c28e83SPiotr Jasiukajtis } 5125c28e83SPiotr Jasiukajtis return ((float)log1p((double)x)); 5225c28e83SPiotr Jasiukajtis } 53