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 log10f = __log10f 30 31 #include "libm.h" 32 33 static const float zero = 0.0f, mone = -1.0f; 34 35 float 36 log10f(float x) { 37 int hx, ix; 38 float w; 39 40 hx = *(int *)&x; 41 ix = hx & ~0x80000000; 42 if (ix > 0x7f800000) 43 return (x * x); 44 if (ix == 0x7f800000) 45 return (x + x * x); 46 if (ix == 0) { 47 w = mone; 48 return (w / zero); 49 } 50 if (hx < 0) { 51 w = zero; 52 return (w / zero); 53 } 54 return ((float)log10((double)x)); 55 } 56