diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/e_coshl.c')
-rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/e_coshl.c | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/e_coshl.c b/sysdeps/ieee754/ldbl-128ibm/e_coshl.c deleted file mode 100644 index 327b2ab960..0000000000 --- a/sysdeps/ieee754/ldbl-128ibm/e_coshl.c +++ /dev/null @@ -1,81 +0,0 @@ -/* @(#)e_cosh.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. - * ==================================================== - */ - -/* __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 <= 40 : cosh(x) := ------------------- - * 2 - * 40 <= 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 long double one = 1.0L, half=0.5L, huge = 1.0e300L; - -long double -__ieee754_coshl (long double x) -{ - long double t,w; - int64_t ix; - double xhi; - - /* High word of |x|. */ - xhi = ldbl_high (x); - EXTRACT_WORDS64 (ix, xhi); - ix &= 0x7fffffffffffffffLL; - - /* x is INF or NaN */ - if(ix>=0x7ff0000000000000LL) return x*x; - - /* |x| in [0,0.5*ln2], return 1+expm1(|x|)^2/(2*exp(|x|)) */ - if(ix<0x3fd62e42fefa39efLL) { - if (ix<0x3c80000000000000LL) return one; /* cosh(tiny) = 1 */ - t = __expm1l(fabsl(x)); - w = one+t; - return one+(t*t)/(w+w); - } - - /* |x| in [0.5*ln2,40], return (exp(|x|)+1/exp(|x|)/2; */ - if (ix < 0x4044000000000000LL) { - t = __ieee754_expl(fabsl(x)); - return half*t+half/t; - } - - /* |x| in [40, log(maxdouble)] return half*exp(|x|) */ - if (ix < 0x40862e42fefa39efLL) return half*__ieee754_expl(fabsl(x)); - - /* |x| in [log(maxdouble), overflowthresold] */ - if (ix < 0x408633ce8fb9f87fLL) { - w = __ieee754_expl(half*fabsl(x)); - t = half*w; - return t*w; - } - - /* |x| > overflowthresold, cosh(x) overflow */ - return huge*huge; -} -strong_alias (__ieee754_coshl, __coshl_finite) |