source: trunk/libs/newlib/src/newlib/libm/math/wf_tgamma.c @ 567

/* w_gammaf.c -- float version of w_gamma.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * 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.
 * ====================================================
 */

#include "math.h"
#include "fdlibm.h"

#ifdef __STDC__
        float tgammaf(float x)
#else
        float tgammaf(x)
        float x;
#endif
{
        float y;
        int local_signgam;
        y = __ieee754_gammaf_r(x,&local_signgam);
        if (local_signgam < 0) y = -y;
#ifdef _IEEE_LIBM
        return y;
#else
        if(_LIB_VERSION == _IEEE_) return y;

        if(!finitef(y)&&finitef(x)) {
          if(floorf(x)==x&&x<=(float)0.0)
            /* tgammaf pole */
            return (float)__kernel_standard((double)x,(double)x,141);
          else
            /* tgammaf overflow */
            return (float)__kernel_standard((double)x,(double)x,140);
        }
        return y;
#endif
}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__
        double tgamma(double x)
#else
        double tgamma(x)
        double x;
#endif
{
        return (double) tgammaf((float) x);
}

#endif /* defined(_DOUBLE_IS_32BITS) */