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-/*
- * 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.
- */
-
-#ifndef lint
-static char sccsid[] = "@(#)log__L.c 8.1 (Berkeley) 6/4/93";
-#endif /* not lint */
-
-/* log__L(Z)
- * LOG(1+X) - 2S X
- * RETURN --------------- WHERE Z = S*S, S = ------- , 0 <= Z <= .0294...
- * S 2 + X
- *
- * DOUBLE PRECISION (VAX D FORMAT 56 bits or IEEE DOUBLE 53 BITS)
- * KERNEL FUNCTION FOR LOG; TO BE USED IN LOG1P, LOG, AND POW FUNCTIONS
- * CODED IN C BY K.C. NG, 1/19/85;
- * REVISED BY K.C. Ng, 2/3/85, 4/16/85.
- *
- * Method :
- * 1. Polynomial approximation: let s = x/(2+x).
- * Based on log(1+x) = log(1+s) - log(1-s)
- * = 2s + 2/3 s**3 + 2/5 s**5 + .....,
- *
- * (log(1+x) - 2s)/s is computed by
- *
- * z*(L1 + z*(L2 + z*(... (L7 + z*L8)...)))
- *
- * where z=s*s. (See the listing below for Lk's values.) The
- * coefficients are obtained by a special Remez algorithm.
- *
- * Accuracy:
- * Assuming no rounding error, the maximum magnitude of the approximation
- * error (absolute) is 2**(-58.49) for IEEE double, and 2**(-63.63)
- * for VAX D format.
- *
- * 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(L1, 6.6666666666666703212E-1 ,aaaa,402a,aac5,aaaa, 0, .AAAAAAAAAAAAC5)
-vc(L2, 3.9999999999970461961E-1 ,cccc,3fcc,2684,cccc, -1, .CCCCCCCCCC2684)
-vc(L3, 2.8571428579395698188E-1 ,4924,3f92,5782,92f8, -1, .92492492F85782)
-vc(L4, 2.2222221233634724402E-1 ,8e38,3f63,af2c,39b7, -2, .E38E3839B7AF2C)
-vc(L5, 1.8181879517064680057E-1 ,2eb4,3f3a,655e,cc39, -2, .BA2EB4CC39655E)
-vc(L6, 1.5382888777946145467E-1 ,8551,3f1d,781d,e8c5, -2, .9D8551E8C5781D)
-vc(L7, 1.3338356561139403517E-1 ,95b3,3f08,cd92,907f, -2, .8895B3907FCD92)
-vc(L8, 1.2500000000000000000E-1 ,0000,3f00,0000,0000, -2, .80000000000000)
-
-ic(L1, 6.6666666666667340202E-1, -1, 1.5555555555592)
-ic(L2, 3.9999999999416702146E-1, -2, 1.999999997FF24)
-ic(L3, 2.8571428742008753154E-1, -2, 1.24924941E07B4)
-ic(L4, 2.2222198607186277597E-1, -3, 1.C71C52150BEA6)
-ic(L5, 1.8183562745289935658E-1, -3, 1.74663CC94342F)
-ic(L6, 1.5314087275331442206E-1, -3, 1.39A1EC014045B)
-ic(L7, 1.4795612545334174692E-1, -3, 1.2F039F0085122)
-
-#ifdef vccast
-#define L1 vccast(L1)
-#define L2 vccast(L2)
-#define L3 vccast(L3)
-#define L4 vccast(L4)
-#define L5 vccast(L5)
-#define L6 vccast(L6)
-#define L7 vccast(L7)
-#define L8 vccast(L8)
-#endif
-
-double __log__L(z)
-double z;
-{
-#if defined(vax)||defined(tahoe)
- return(z*(L1+z*(L2+z*(L3+z*(L4+z*(L5+z*(L6+z*(L7+z*L8))))))));
-#else /* defined(vax)||defined(tahoe) */
- return(z*(L1+z*(L2+z*(L3+z*(L4+z*(L5+z*(L6+z*L7)))))));
-#endif /* defined(vax)||defined(tahoe) */
-}