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[/] [scarts/] [trunk/] [toolchain/] [scarts-newlib/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [wf_pow.c] - Blame information for rev 9

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1 9 jlechner 
/* wf_pow.c -- float version of w_pow.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 powf(x,y) return x**y
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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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        float powf(float x, float y)    /* wrapper powf */
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#else
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        float powf(x,y)                 /* wrapper powf */
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        float x,y;
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#endif
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{
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#ifdef _IEEE_LIBM
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        return  __ieee754_powf(x,y);
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#else
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        float z;
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        struct exception exc;
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        z=__ieee754_powf(x,y);
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        if(_LIB_VERSION == _IEEE_|| isnanf(y)) return z;
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        if(isnanf(x)) {
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            if(y==(float)0.0) {
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                /* powf(NaN,0.0) */
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                /* error only if _LIB_VERSION == _SVID_ & _XOPEN_ */
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                exc.type = DOMAIN;
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                exc.name = "powf";
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                exc.err = 0;
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                exc.arg1 = (double)x;
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                exc.arg2 = (double)y;
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                exc.retval = 1.0;
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                if (_LIB_VERSION == _IEEE_ ||
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                    _LIB_VERSION == _POSIX_) exc.retval = 1.0;
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                else if (!matherr(&exc)) {
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                        errno = EDOM;
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                }
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                if (exc.err != 0)
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                   errno = exc.err;
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                return (float)exc.retval;
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            } else
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                return z;
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        }
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        if(x==(float)0.0){
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            if(y==(float)0.0) {
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                /* powf(0.0,0.0) */
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                /* error only if _LIB_VERSION == _SVID_ */
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                exc.type = DOMAIN;
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                exc.name = "powf";
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                exc.err = 0;
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                exc.arg1 = (double)x;
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                exc.arg2 = (double)y;
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                exc.retval = 0.0;
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                if (_LIB_VERSION != _SVID_) exc.retval = 1.0;
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                else if (!matherr(&exc)) {
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                        errno = EDOM;
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                }
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                if (exc.err != 0)
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                   errno = exc.err;
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                return (float)exc.retval;
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            }
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            if(finitef(y)&&y<(float)0.0) {
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                /* 0**neg */
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                exc.type = DOMAIN;
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                exc.name = "powf";
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                exc.err = 0;
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                exc.arg1 = (double)x;
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                exc.arg2 = (double)y;
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                if (_LIB_VERSION == _SVID_)
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                  exc.retval = 0.0;
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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 = EDOM;
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                else if (!matherr(&exc)) {
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                  errno = EDOM;
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                }
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                if (exc.err != 0)
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                   errno = exc.err;
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                return (float)exc.retval;
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            }
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            return z;
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        }
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        if(!finitef(z)) {
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            if(finitef(x)&&finitef(y)) {
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                if(isnanf(z)) {
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                    /* neg**non-integral */
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                    exc.type = DOMAIN;
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                    exc.name = "powf";
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                    exc.err = 0;
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                    exc.arg1 = (double)x;
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                    exc.arg2 = (double)y;
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                    if (_LIB_VERSION == _SVID_)
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                        exc.retval = 0.0;
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                    else
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                        exc.retval = 0.0/0.0;   /* X/Open allow NaN */
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                    if (_LIB_VERSION == _POSIX_)
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                        errno = EDOM;
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                    else if (!matherr(&exc)) {
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                        errno = EDOM;
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                    }
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                    if (exc.err != 0)
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                        errno = exc.err;
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                    return (float)exc.retval;
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                } else {
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                    /* powf(x,y) overflow */
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                    exc.type = OVERFLOW;
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                    exc.name = "powf";
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                    exc.err = 0;
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                    exc.arg1 = (double)x;
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                    exc.arg2 = (double)y;
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                    if (_LIB_VERSION == _SVID_) {
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                       exc.retval = HUGE;
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                       y *= 0.5;
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                       if(x<0.0&&rint(y)!=y) exc.retval = -HUGE;
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                    } else {
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                       exc.retval = HUGE_VAL;
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                       y *= 0.5;
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                       if(x<0.0&&rint(y)!=y) exc.retval = -HUGE_VAL;
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                    }
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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 (float)exc.retval;
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                }
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            }
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        }
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        if(z==(float)0.0&&finitef(x)&&finitef(y)) {
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            /* powf(x,y) underflow */
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            exc.type = UNDERFLOW;
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            exc.name = "powf";
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            exc.err = 0;
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            exc.arg1 = (double)x;
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            exc.arg2 = (double)y;
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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 (float)exc.retval;
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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 pow(double x, double y)
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#else
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        double pow(x,y)
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        double x,y;
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#endif
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{
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        return (double) powf((float) x, (float) y);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */

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