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Diffstat (limited to 'newlib/libm/mathfp/s_asinh.c')
-rw-r--r-- | newlib/libm/mathfp/s_asinh.c | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/newlib/libm/mathfp/s_asinh.c b/newlib/libm/mathfp/s_asinh.c deleted file mode 100644 index 43b9d49..0000000 --- a/newlib/libm/mathfp/s_asinh.c +++ /dev/null @@ -1,107 +0,0 @@ - -/* @(#)s_asinh.c 5.1 93/09/24 */ -/* - * ==================================================== - * 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. - * ==================================================== - */ - -/* -FUNCTION - <<asinh>>, <<asinhf>>---inverse hyperbolic sine - -INDEX - asinh -INDEX - asinhf - -ANSI_SYNOPSIS - #include <math.h> - double asinh(double <[x]>); - float asinhf(float <[x]>); - -TRAD_SYNOPSIS - #include <math.h> - double asinh(<[x]>) - double <[x]>; - - float asinhf(<[x]>) - float <[x]>; - -DESCRIPTION -<<asinh>> calculates the inverse hyperbolic sine of <[x]>. -<<asinh>> is defined as -@ifinfo -. sgn(<[x]>) * log(abs(<[x]>) + sqrt(1+<[x]>*<[x]>)) -@end ifinfo -@tex -$$sign(x) \times ln\Bigl(|x| + \sqrt{1+x^2}\Bigr)$$ -@end tex - -<<asinhf>> is identical, other than taking and returning floats. - -RETURNS -<<asinh>> and <<asinhf>> return the calculated value. - -PORTABILITY -Neither <<asinh>> nor <<asinhf>> are ANSI C. - -*/ - -/* asinh(x) - * Method : - * Based on - * asinh(x) = sign(x) * log [ |x| + sqrt(x*x+1) ] - * we have - * asinh(x) := x if 1+x*x=1, - * := sign(x)*(log(x)+ln2)) for large |x|, else - * := sign(x)*log(2|x|+1/(|x|+sqrt(x*x+1))) if|x|>2, else - * := sign(x)*log1p(|x| + x^2/(1 + sqrt(1+x^2))) - */ - -#include "fdlibm.h" - -#ifndef _DOUBLE_IS_32BITS - -#ifdef __STDC__ -static const double -#else -static double -#endif -one = 1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */ -ln2 = 6.93147180559945286227e-01, /* 0x3FE62E42, 0xFEFA39EF */ -huge= 1.00000000000000000000e+300; - -#ifdef __STDC__ - double asinh(double x) -#else - double asinh(x) - double x; -#endif -{ - double t,w; - __int32_t hx,ix; - GET_HIGH_WORD(hx,x); - ix = hx&0x7fffffff; - if(ix>=0x7ff00000) return x+x; /* x is inf or NaN */ - if(ix< 0x3e300000) { /* |x|<2**-28 */ - if(huge+x>one) return x; /* return x inexact except 0 */ - } - if(ix>0x41b00000) { /* |x| > 2**28 */ - w = log(fabs(x))+ln2; - } else if (ix>0x40000000) { /* 2**28 > |x| > 2.0 */ - t = fabs(x); - w = log(2.0*t+one/(sqrt(x*x+one)+t)); - } else { /* 2.0 > |x| > 2**-28 */ - t = x*x; - w =log1p(fabs(x)+t/(one+sqrt(one+t))); - } - if(hx>0) return w; else return -w; -} - -#endif /* _DOUBLE_IS_32BITS */ |