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authorbde <bde@FreeBSD.org>2002-03-21 00:42:48 +0000
committerbde <bde@FreeBSD.org>2002-03-21 00:42:48 +0000
commitbe2cf84b24905468b296d0b27d7c0459acd4dec8 (patch)
tree57bd79659e7f6862429527509385c95663b5c33b /lib/libm/common_source/cosh.c
parente1ec4d77dcf9547ad4c02a371fcae1d9f176c338 (diff)
downloadFreeBSD-src-be2cf84b24905468b296d0b27d7c0459acd4dec8.zip
FreeBSD-src-be2cf84b24905468b296d0b27d7c0459acd4dec8.tar.gz
Removed all files in libm except README-FREEBSD and files needed to
implement tgamma().
Diffstat (limited to 'lib/libm/common_source/cosh.c')
-rw-r--r--lib/libm/common_source/cosh.c136
1 files changed, 0 insertions, 136 deletions
diff --git a/lib/libm/common_source/cosh.c b/lib/libm/common_source/cosh.c
deleted file mode 100644
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--- a/lib/libm/common_source/cosh.c
+++ /dev/null
@@ -1,136 +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[] = "@(#)cosh.c 8.1 (Berkeley) 6/4/93";
-#endif /* not lint */
-
-/* COSH(X)
- * RETURN THE HYPERBOLIC COSINE OF X
- * DOUBLE PRECISION (VAX D format 56 bits, IEEE DOUBLE 53 BITS)
- * CODED IN C BY K.C. NG, 1/8/85;
- * REVISED BY K.C. NG on 2/8/85, 2/23/85, 3/7/85, 3/29/85, 4/16/85.
- *
- * Required system supported functions :
- * copysign(x,y)
- * scalb(x,N)
- *
- * Required kernel function:
- * exp(x)
- * exp__E(x,c) ...return exp(x+c)-1-x for |x|<0.3465
- *
- * Method :
- * 1. Replace x by |x|.
- * 2.
- * [ exp(x) - 1 ]^2
- * 0 <= x <= 0.3465 : cosh(x) := 1 + -------------------
- * 2*exp(x)
- *
- * exp(x) + 1/exp(x)
- * 0.3465 <= x <= 22 : cosh(x) := -------------------
- * 2
- * 22 <= x <= lnovfl : cosh(x) := exp(x)/2
- * lnovfl <= x <= lnovfl+log(2)
- * : cosh(x) := exp(x)/2 (avoid overflow)
- * log(2)+lnovfl < x < INF: overflow to INF
- *
- * Note: .3465 is a number near one half of ln2.
- *
- * Special cases:
- * cosh(x) is x if x is +INF, -INF, or NaN.
- * only cosh(0)=1 is exact for finite x.
- *
- * Accuracy:
- * cosh(x) returns the exact hyperbolic cosine of x nearly rounded.
- * In a test run with 768,000 random arguments on a VAX, the maximum
- * observed error was 1.23 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(mln2hi, 8.8029691931113054792E1 ,0f33,43b0,2bdb,c7e2, 7, .B00F33C7E22BDB)
-vc(mln2lo,-4.9650192275318476525E-16 ,1b60,a70f,582a,279e, -50,-.8F1B60279E582A)
-vc(lnovfl, 8.8029691931113053016E1 ,0f33,43b0,2bda,c7e2, 7, .B00F33C7E22BDA)
-
-ic(mln2hi, 7.0978271289338397310E2, 10, 1.62E42FEFA39EF)
-ic(mln2lo, 2.3747039373786107478E-14, -45, 1.ABC9E3B39803F)
-ic(lnovfl, 7.0978271289338397310E2, 9, 1.62E42FEFA39EF)
-
-#ifdef vccast
-#define mln2hi vccast(mln2hi)
-#define mln2lo vccast(mln2lo)
-#define lnovfl vccast(lnovfl)
-#endif
-
-#if defined(vax)||defined(tahoe)
-static max = 126 ;
-#else /* defined(vax)||defined(tahoe) */
-static max = 1023 ;
-#endif /* defined(vax)||defined(tahoe) */
-
-double cosh(x)
-double x;
-{
- static const double half=1.0/2.0,
- one=1.0, small=1.0E-18; /* fl(1+small)==1 */
- double t;
-
-#if !defined(vax)&&!defined(tahoe)
- if(x!=x) return(x); /* x is NaN */
-#endif /* !defined(vax)&&!defined(tahoe) */
- if((x=copysign(x,one)) <= 22)
- if(x<0.3465)
- if(x<small) return(one+x);
- else {t=x+__exp__E(x,0.0);x=t+t; return(one+t*t/(2.0+x)); }
-
- else /* for x lies in [0.3465,22] */
- { t=exp(x); return((t+one/t)*half); }
-
- if( lnovfl <= x && x <= (lnovfl+0.7))
- /* for x lies in [lnovfl, lnovfl+ln2], decrease x by ln(2^(max+1))
- * and return 2^max*exp(x) to avoid unnecessary overflow
- */
- return(scalb(exp((x-mln2hi)-mln2lo), max));
-
- else
- return(exp(x)*half); /* for large x, cosh(x)=exp(x)/2 */
-}
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