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Diffstat (limited to 'lib/libm/common_source/log10.c')
-rw-r--r-- | lib/libm/common_source/log10.c | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/lib/libm/common_source/log10.c b/lib/libm/common_source/log10.c deleted file mode 100644 index d19c28b..0000000 --- a/lib/libm/common_source/log10.c +++ /dev/null @@ -1,98 +0,0 @@ -/* - * Copyright (c) 1985, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#ifndef lint -static char sccsid[] = "@(#)log10.c 8.1 (Berkeley) 6/4/93"; -#endif /* not lint */ - -/* LOG10(X) - * RETURN THE BASE 10 LOGARITHM OF x - * DOUBLE PRECISION (VAX D format 56 bits, IEEE DOUBLE 53 BITS) - * CODED IN C BY K.C. NG, 1/20/85; - * REVISED BY K.C. NG on 1/23/85, 3/7/85, 4/16/85. - * - * Required kernel function: - * log(x) - * - * Method : - * log(x) - * log10(x) = --------- or [1/log(10)]*log(x) - * log(10) - * - * Note: - * [log(10)] rounded to 56 bits has error .0895 ulps, - * [1/log(10)] rounded to 53 bits has error .198 ulps; - * therefore, for better accuracy, in VAX D format, we divide - * log(x) by log(10), but in IEEE Double format, we multiply - * log(x) by [1/log(10)]. - * - * Special cases: - * log10(x) is NaN with signal if x < 0; - * log10(+INF) is +INF with no signal; log10(0) is -INF with signal; - * log10(NaN) is that NaN with no signal. - * - * Accuracy: - * log10(X) returns the exact log10(x) nearly rounded. In a test run - * with 1,536,000 random arguments on a VAX, the maximum observed - * error was 1.74 ulps (units in the last place). - * - * Constants: - * The hexadecimal values are the intended ones for the following constants. - * The decimal values may be used, provided that the compiler will convert - * from decimal to binary accurately enough to produce the hexadecimal values - * shown. - */ - -#include "mathimpl.h" - -vc(ln10hi, 2.3025850929940456790E0 ,5d8d,4113,a8ac,ddaa, 2, .935D8DDDAAA8AC) - -ic(ivln10, 4.3429448190325181667E-1, -2, 1.BCB7B1526E50E) - -#ifdef vccast -#define ln10hi vccast(ln10hi) -#endif - - -double log10(x) -double x; -{ -#if defined(vax)||defined(tahoe) - return(log(x)/ln10hi); -#else /* defined(vax)||defined(tahoe) */ - return(ivln10*log(x)); -#endif /* defined(vax)||defined(tahoe) */ -} |