diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/wordsize-64/e_acosh.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/e_acosh.c | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/e_acosh.c b/sysdeps/ieee754/dbl-64/wordsize-64/e_acosh.c deleted file mode 100644 index a241366f30..0000000000 --- a/sysdeps/ieee754/dbl-64/wordsize-64/e_acosh.c +++ /dev/null @@ -1,68 +0,0 @@ -/* Optimized for 64-bit by Ulrich Drepper <drepper@gmail.com>, 2012 */ -/* - * ==================================================== - * 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. - * ==================================================== - */ - -/* __ieee754_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 <math.h> -#include <math_private.h> -#include <libm-alias-finite.h> - -static const double -one = 1.0, -ln2 = 6.93147180559945286227e-01; /* 0x3FE62E42, 0xFEFA39EF */ - -double -__ieee754_acosh (double x) -{ - int64_t hx; - EXTRACT_WORDS64 (hx, x); - - if (hx > INT64_C (0x4000000000000000)) - { - if (__glibc_unlikely (hx >= INT64_C (0x41b0000000000000))) - { - /* x > 2**28 */ - if (hx >= INT64_C (0x7ff0000000000000)) - /* x is inf of NaN */ - return x + x; - else - return __ieee754_log (x) + ln2;/* acosh(huge)=log(2x) */ - } - - /* 2**28 > x > 2 */ - double t = x * x; - return __ieee754_log (2.0 * x - one / (x + sqrt (t - one))); - } - else if (__glibc_likely (hx > INT64_C (0x3ff0000000000000))) - { - /* 1<x<2 */ - double t = x - one; - return __log1p (t + sqrt (2.0 * t + t * t)); - } - else if (__glibc_likely (hx == INT64_C (0x3ff0000000000000))) - return 0.0; /* acosh(1) = 0 */ - else /* x < 1 */ - return (x - x) / (x - x); -} -libm_alias_finite (__ieee754_acosh, __acosh) |