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[/] [or1k/] [trunk/] [newlib-1.10.0/] [newlib/] [libm/] [math/] [wf_exp.c] - Blame information for rev 1765

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1 1010 ivang 
/* wf_exp.c -- float version of w_exp.c.
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 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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 */
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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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 * wrapper expf(x)
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 */
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#include "fdlibm.h"
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#include <errno.h>
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#ifdef __STDC__
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static const float
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#else
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static float
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#endif
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o_threshold=  8.8721679688e+01,  /* 0x42b17180 */
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u_threshold= -1.0397208405e+02;  /* 0xc2cff1b5 */
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#ifdef __STDC__
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        float expf(float x)             /* wrapper expf */
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#else
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        float expf(x)                   /* wrapper expf */
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        float x;
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#endif
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{
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#ifdef _IEEE_LIBM
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        return __ieee754_expf(x);
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#else
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        float z;
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        struct exception exc;
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        z = __ieee754_expf(x);
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        if(_LIB_VERSION == _IEEE_) return z;
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        if(finitef(x)) {
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            if(x>o_threshold) {
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                /* expf(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 = "expf";
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                exc.err = 0;
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                exc.arg1 = exc.arg2 = (double)x;
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                if (_LIB_VERSION == _SVID_)
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                  exc.retval = HUGE;
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                else
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                  exc.retval = 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 if(x<u_threshold) {
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                /* expf(finite) underflow */
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                exc.type = UNDERFLOW;
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                exc.name = "expf";
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                exc.err = 0;
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                exc.arg1 = exc.arg2 = (double)x;
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                exc.retval = 0.0;
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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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            }
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        }
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        return z;
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#endif
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}
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#ifdef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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        double exp(double x)
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#else
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        double exp(x)
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        double x;
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#endif
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{
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        return (double) expf((float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */

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