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 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23 */ 24 /* 25 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #pragma weak __log1pf = log1pf 30 31 #include "libm.h" 32 33 static const float zero = 0.0f; 34 35 float 36 log1pf(float x) { 37 int ix; 38 39 ix = *(int *)&x; 40 if (ix >= 0x7f800000) { 41 /* x is +inf or nan */ 42 return (x * x); 43 } 44 if (ix < 0) { 45 ix &= ~0x80000000; 46 if (ix == 0x3f800000) /* x is -1 */ 47 return (x / zero); 48 if (ix > 0x3f800000) /* x is < -1 or nan */ 49 return ((x * zero) / zero); 50 } 51 return ((float)log1p((double)x)); 52 } 53