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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [w_sinh.c] - Blame information for rev 455

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1 148 jeremybenn 
 
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/* @(#)w_sinh.c 5.1 93/09/24 */
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/*
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 * ====================================================
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 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 *
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 * Developed at SunPro, a Sun Microsystems, Inc. business.
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 * Permission to use, copy, modify, and distribute this
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 * software is freely granted, provided that this notice
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 * is preserved.
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 * ====================================================
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 */
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/*
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FUNCTION
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        <<sinh>>, <<sinhf>>---hyperbolic sine
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INDEX
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        sinh
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INDEX
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        sinhf
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ANSI_SYNOPSIS
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        #include <math.h>
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        double sinh(double <[x]>);
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        float  sinhf(float <[x]>);
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TRAD_SYNOPSIS
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        #include <math.h>
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        double sinh(<[x]>)
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        double <[x]>;
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        float  sinhf(<[x]>)
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        float <[x]>;
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DESCRIPTION
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        <<sinh>> computes the hyperbolic sine of the argument <[x]>.
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        Angles are specified in radians.   <<sinh>>(<[x]>) is defined as
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        @ifnottex
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        . (exp(<[x]>) - exp(-<[x]>))/2
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        @end ifnottex
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        @tex
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        $${e^x - e^{-x}}\over 2$$
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        @end tex
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        <<sinhf>> is identical, save that it takes and returns <<float>> values.
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RETURNS
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        The hyperbolic sine of <[x]> is returned.
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        When the correct result is too large to be representable (an
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        overflow),  <<sinh>> returns <<HUGE_VAL>> with the
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        appropriate sign, and sets the global value <<errno>> to
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        <<ERANGE>>.
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        You can modify error handling for these functions with <<matherr>>.
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PORTABILITY
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        <<sinh>> is ANSI C.
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        <<sinhf>> is an extension.
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QUICKREF
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        sinh ansi pure
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        sinhf - pure
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*/
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/*
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 * wrapper sinh(x)
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 */
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#include "fdlibm.h"
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#include <errno.h>
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#ifndef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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        double sinh(double x)           /* wrapper sinh */
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#else
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        double sinh(x)                  /* wrapper sinh */
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        double x;
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#endif
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{
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#ifdef _IEEE_LIBM
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        return __ieee754_sinh(x);
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#else
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        double z;
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        struct exception exc;
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        z = __ieee754_sinh(x);
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        if(_LIB_VERSION == _IEEE_) return z;
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        if(!finite(z)&&finite(x)) {
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            /* sinh(finite) overflow */
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#ifndef HUGE_VAL
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#define HUGE_VAL inf
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            double inf = 0.0;
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            SET_HIGH_WORD(inf,0x7ff00000);      /* set inf to infinite */
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#endif
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            exc.type = OVERFLOW;
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            exc.name = "sinh";
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            exc.err = 0;
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            exc.arg1 = exc.arg2 = x;
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            if (_LIB_VERSION == _SVID_)
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               exc.retval = ( (x>0.0) ? HUGE : -HUGE);
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            else
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               exc.retval = ( (x>0.0) ? HUGE_VAL : -HUGE_VAL);
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            if (_LIB_VERSION == _POSIX_)
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               errno = ERANGE;
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            else if (!matherr(&exc)) {
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               errno = ERANGE;
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            }
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            if (exc.err != 0)
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               errno = exc.err;
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            return exc.retval;
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        } else
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            return z;
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#endif
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */

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