diff options
Diffstat (limited to 'sysdeps/libm-ieee754/e_coshl.c')
-rw-r--r-- | sysdeps/libm-ieee754/e_coshl.c | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/sysdeps/libm-ieee754/e_coshl.c b/sysdeps/libm-ieee754/e_coshl.c deleted file mode 100644 index 6af846cb2d..0000000000 --- a/sysdeps/libm-ieee754/e_coshl.c +++ /dev/null @@ -1,94 +0,0 @@ -/* - * ==================================================== - * 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. - * ==================================================== - */ - -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: e_cosh.c,v 1.7 1995/05/10 20:44:58 jtc Exp $"; -#endif - -/* __ieee754_coshl(x) - * Method : - * mathematically coshl(x) if defined to be (exp(x)+exp(-x))/2 - * 1. Replace x by |x| (coshl(x) = coshl(-x)). - * 2. - * [ exp(x) - 1 ]^2 - * 0 <= x <= ln2/2 : coshl(x) := 1 + ------------------- - * 2*exp(x) - * - * exp(x) + 1/exp(x) - * ln2/2 <= x <= 22 : coshl(x) := ------------------- - * 2 - * 22 <= x <= lnovft : coshl(x) := expl(x)/2 - * lnovft <= x <= ln2ovft: coshl(x) := expl(x/2)/2 * expl(x/2) - * ln2ovft < x : coshl(x) := huge*huge (overflow) - * - * Special cases: - * coshl(x) is |x| if x is +INF, -INF, or NaN. - * only coshl(0)=1 is exact for finite x. - */ - -#include "math.h" -#include "math_private.h" - -#ifdef __STDC__ -static const long double one = 1.0, half=0.5, huge = 1.0e4900L; -#else -static long double one = 1.0, half=0.5, huge = 1.0e4900L; -#endif - -#ifdef __STDC__ - long double __ieee754_coshl(long double x) -#else - long double __ieee754_coshl(x) - long double x; -#endif -{ - long double t,w; - int32_t ex; - u_int32_t mx,lx; - - /* High word of |x|. */ - GET_LDOUBLE_WORDS(ex,mx,lx,x); - ex &= 0x7fff; - - /* x is INF or NaN */ - if(ex==0x7fff) return x*x; - - /* |x| in [0,0.5*ln2], return 1+expm1l(|x|)^2/(2*expl(|x|)) */ - if(ex < 0x3ffd || (ex == 0x3ffd && mx < 0xb17217f7u)) { - t = __expm1l(fabsl(x)); - w = one+t; - if (ex<0x3fbc) return w; /* cosh(tiny) = 1 */ - return one+(t*t)/(w+w); - } - - /* |x| in [0.5*ln2,22], return (exp(|x|)+1/exp(|x|)/2; */ - if (ex < 0x4003 || (ex == 0x4003 && mx < 0xb0000000u)) { - t = __ieee754_expl(fabsl(x)); - return half*t+half/t; - } - - /* |x| in [22, ln(maxdouble)] return half*exp(|x|) */ - if (ex < 0x400c || (ex == 0x400c && mx < 0xb1700000u)) - return half*__ieee754_expl(fabsl(x)); - - /* |x| in [log(maxdouble), overflowthresold] */ - if (ex < 0x400d - || (ex == 0x400d && (mx < 0xb170b513u - || (mx == 0xb170b513u && lx < 0xa1dfd60cu)))) - { - w = __ieee754_expl(half*fabsl(x)); - t = half*w; - return t*w; - } - - /* |x| > overflowthresold, cosh(x) overflow */ - return huge*huge; -} |