log10f.c revision ddc0e0b53c661f6e439e3b7072b3ef353eadb4af
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma weak __log10f = log10f
#include "libm.h"
static const float zero = 0.0f, mone = -1.0f;
float
log10f(float x) {
int hx, ix;
float w;
hx = *(int *)&x;
ix = hx & ~0x80000000;
if (ix > 0x7f800000)
return (x * x);
if (ix == 0x7f800000)
return (x + x * x);
if (ix == 0) {
w = mone;
return (w / zero);
}
if (hx < 0) {
w = zero;
return (w / zero);
}
return ((float)log10((double)x));
}