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Diffstat (limited to 'newlib/libm/mathfp/e_acosh.c')
| -rw-r--r-- | newlib/libm/mathfp/e_acosh.c | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/newlib/libm/mathfp/e_acosh.c b/newlib/libm/mathfp/e_acosh.c deleted file mode 100644 index a48420304..000000000 --- a/newlib/libm/mathfp/e_acosh.c +++ /dev/null @@ -1,135 +0,0 @@ - -/* @(#)e_acosh.c 5.1 93/09/24 */ - -/* -FUNCTION -<<acosh>>, <<acoshf>>---inverse hyperbolic cosine - -INDEX -acosh -INDEX -acoshf - -ANSI_SYNOPSIS - #include <math.h> - double acosh(double <[x]>); - float acoshf(float <[x]>); - -TRAD_SYNOPSIS - #include <math.h> - double acosh(<[x]>) - double <[x]>; - - float acoshf(<[x]>) - float <[x]>; - -DESCRIPTION -<<acosh>> calculates the inverse hyperbolic cosine of <[x]>. -<<acosh>> is defined as -@ifinfo -. log(<[x]> + sqrt(<[x]>*<[x]>-1)) -@end ifinfo -@tex -$$ln\Bigl(x + \sqrt{x^2-1}\Bigr)$$ -@end tex - -<[x]> must be a number greater than or equal to 1. - -<<acoshf>> is identical, other than taking and returning floats. - -RETURNS -<<acosh>> and <<acoshf>> return the calculated value. If <[x]> -less than 1, the return value is NaN and <<errno>> is set to <<EDOM>>. - -You can change the error-handling behavior with the non-ANSI -<<matherr>> function. - -PORTABILITY -Neither <<acosh>> nor <<acoshf>> are ANSI C. They are not recommended -for portable programs. - - -QUICKREF ANSI SVID POSIX RENTRANT - acos n,n,n,m - acosf n,n,n,m - -MATHREF - acosh, NAN, arg,DOMAIN,EDOM - acosh, < 1.0, NAN,DOMAIN,EDOM - acosh, >=1.0, acosh(arg),,, - -MATHREF - acoshf, NAN, arg,DOMAIN,EDOM - acoshf, < 1.0, NAN,DOMAIN,EDOM - acoshf, >=1.0, acosh(arg),,, - -*/ - -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunPro, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - * - */ - -/* acosh(x) - * Method : - * Based on - * acosh(x) = log [ x + sqrt(x*x-1) ] - * we have - * acosh(x) := log(x)+ln2, if x is large; else - * acosh(x) := log(2x-1/(sqrt(x*x-1)+x)) if x>2; else - * acosh(x) := log1p(t+sqrt(2.0*t+t*t)); where t=x-1. - * - * Special cases: - * acosh(x) is NaN with signal if x<1. - * acosh(NaN) is NaN without signal. - */ - -#include "fdlibm.h" - -#ifndef _DOUBLE_IS_32BITS - -#ifdef __STDC__ -static const double -#else -static double -#endif -one = 1.0, -ln2 = 6.93147180559945286227e-01; /* 0x3FE62E42, 0xFEFA39EF */ - -#ifdef __STDC__ - double acosh(double x) -#else - double acosh(x) - double x; -#endif -{ - double t; - __int32_t hx; - __uint32_t lx; - EXTRACT_WORDS(hx,lx,x); - if(hx<0x3ff00000) { /* x < 1 */ - return (x-x)/(x-x); - } else if(hx >=0x41b00000) { /* x > 2**28 */ - if(hx >=0x7ff00000) { /* x is inf of NaN */ - return x+x; - } else - return log(x)+ln2; /* acosh(huge)=log(2x) */ - } else if(((hx-0x3ff00000)|lx)==0) { - return 0.0; /* acosh(1) = 0 */ - } else if (hx > 0x40000000) { /* 2**28 > x > 2 */ - t=x*x; - return log(2.0*x-one/(x+sqrt(t-one))); - } else { /* 1<x<2 */ - t = x-one; - return log1p(t+sqrt(2.0*t+t*t)); - } -} - -#endif /* defined(_DOUBLE_IS_32BITS) */ |