diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/e_cosh.c')
-rw-r--r-- | sysdeps/ieee754/dbl-64/e_cosh.c | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_cosh.c b/sysdeps/ieee754/dbl-64/e_cosh.c deleted file mode 100644 index 52a5d5007d..0000000000 --- a/sysdeps/ieee754/dbl-64/e_cosh.c +++ /dev/null @@ -1,88 +0,0 @@ -/* Optimized by Ulrich Drepper <drepper@gmail.com>, 2011 */ -/* - * ==================================================== - * 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_cosh(x) - * Method : - * mathematically cosh(x) if defined to be (exp(x)+exp(-x))/2 - * 1. Replace x by |x| (cosh(x) = cosh(-x)). - * 2. - * [ exp(x) - 1 ]^2 - * 0 <= x <= ln2/2 : cosh(x) := 1 + ------------------- - * 2*exp(x) - * - * exp(x) + 1/exp(x) - * ln2/2 <= x <= 22 : cosh(x) := ------------------- - * 2 - * 22 <= x <= lnovft : cosh(x) := exp(x)/2 - * lnovft <= x <= ln2ovft: cosh(x) := exp(x/2)/2 * exp(x/2) - * ln2ovft < x : cosh(x) := huge*huge (overflow) - * - * Special cases: - * cosh(x) is |x| if x is +INF, -INF, or NaN. - * only cosh(0)=1 is exact for finite x. - */ - -#include <math.h> -#include <math_private.h> - -static const double one = 1.0, half = 0.5, huge = 1.0e300; - -double -__ieee754_cosh (double x) -{ - double t, w; - int32_t ix; - u_int32_t lx; - - /* High word of |x|. */ - GET_HIGH_WORD (ix, x); - ix &= 0x7fffffff; - - /* |x| in [0,22] */ - if (ix < 0x40360000) - { - /* |x| in [0,0.5*ln2], return 1+expm1(|x|)^2/(2*exp(|x|)) */ - if (ix < 0x3fd62e43) - { - if (ix < 0x3c800000) - return one; /* cosh(tiny) = 1 */ - t = __expm1 (fabs (x)); - w = one + t; - return one + (t * t) / (w + w); - } - - /* |x| in [0.5*ln2,22], return (exp(|x|)+1/exp(|x|)/2; */ - t = __ieee754_exp (fabs (x)); - return half * t + half / t; - } - - /* |x| in [22, log(maxdouble)] return half*exp(|x|) */ - if (ix < 0x40862e42) - return half * __ieee754_exp (fabs (x)); - - /* |x| in [log(maxdouble), overflowthresold] */ - GET_LOW_WORD (lx, x); - if (ix < 0x408633ce || ((ix == 0x408633ce) && (lx <= (u_int32_t) 0x8fb9f87d))) - { - w = __ieee754_exp (half * fabs (x)); - t = half * w; - return t * w; - } - - /* x is INF or NaN */ - if (ix >= 0x7ff00000) - return x * x; - - /* |x| > overflowthresold, cosh(x) overflow */ - return math_narrow_eval (huge * huge); -} -strong_alias (__ieee754_cosh, __cosh_finite) |