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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [w_cosh.c] - Rev 148
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/* @(#)w_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. * ==================================================== */ /* FUNCTION <<cosh>>, <<coshf>>---hyperbolic cosine ANSI_SYNOPSIS #include <math.h> double cosh(double <[x]>); float coshf(float <[x]>) TRAD_SYNOPSIS #include <math.h> double cosh(<[x]>) double <[x]>; float coshf(<[x]>) float <[x]>; DESCRIPTION <<cosh>> computes the hyperbolic cosine of the argument <[x]>. <<cosh(<[x]>)>> is defined as @ifnottex . (exp(x) + exp(-x))/2 @end ifnottex @tex $${(e^x + e^{-x})} \over 2$$ @end tex Angles are specified in radians. <<coshf>> is identical, save that it takes and returns <<float>>. RETURNS The computed value is returned. When the correct value would create an overflow, <<cosh>> returns the value <<HUGE_VAL>> with the appropriate sign, and the global value <<errno>> is set to <<ERANGE>>. You can modify error handling for these functions using the function <<matherr>>. PORTABILITY <<cosh>> is ANSI. <<coshf>> is an extension. QUICKREF cosh ansi pure coshf - pure */ /* * wrapper cosh(x) */ #include "fdlibm.h" #include <errno.h> #ifndef _DOUBLE_IS_32BITS #ifdef __STDC__ double cosh(double x) /* wrapper cosh */ #else double cosh(x) /* wrapper cosh */ double x; #endif { #ifdef _IEEE_LIBM return __ieee754_cosh(x); #else double z; struct exception exc; z = __ieee754_cosh(x); if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; if(fabs(x)>7.10475860073943863426e+02) { /* cosh(finite) overflow */ #ifndef HUGE_VAL #define HUGE_VAL inf double inf = 0.0; SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ #endif exc.type = OVERFLOW; exc.name = "cosh"; exc.err = 0; exc.arg1 = exc.arg2 = x; if (_LIB_VERSION == _SVID_) exc.retval = HUGE; else exc.retval = HUGE_VAL; if (_LIB_VERSION == _POSIX_) errno = ERANGE; else if (!matherr(&exc)) { errno = ERANGE; } if (exc.err != 0) errno = exc.err; return exc.retval; } else return z; #endif } #endif /* defined(_DOUBLE_IS_32BITS) */
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