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circuitpython/lib/libm/wf_lgamma.c

98 lines
2.3 KiB

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* These math functions are taken from newlib-nano-2, the newlib/libm/math
* directory, available from https://github.com/32bitmicro/newlib-nano-2.
*
* Appropriate copyright headers are reproduced below.
*/
/* wf_lgamma.c -- float version of w_lgamma.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 "fdlibm.h"
#define _IEEE_LIBM 1
//#include <reent.h>
//#include <errno.h>
#ifdef __STDC__
float lgammaf(float x)
#else
float lgammaf(x)
float x;
#endif
{
#ifdef _IEEE_LIBM
int sign;
return __ieee754_lgammaf_r(x,&sign);
#else
float y;
struct exception exc;
y = __ieee754_lgammaf_r(x,&(_REENT_SIGNGAM(_REENT)));
if(_LIB_VERSION == _IEEE_) return y;
if(!finitef(y)&&finitef(x)) {
#ifndef HUGE_VAL
#define HUGE_VAL inf
double inf = 0.0;
SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */
#endif
exc.name = "lgammaf";
exc.err = 0;
exc.arg1 = exc.arg2 = (double)x;
if (_LIB_VERSION == _SVID_)
exc.retval = HUGE;
else
exc.retval = HUGE_VAL;
if(floorf(x)==x&&x<=(float)0.0) {
/* lgammaf(-integer) */
exc.type = SING;
if (_LIB_VERSION == _POSIX_)
errno = EDOM;
else if (!matherr(&exc)) {
errno = EDOM;
}
} else {
/* lgammaf(finite) overflow */
exc.type = OVERFLOW;
if (_LIB_VERSION == _POSIX_)
errno = ERANGE;
else if (!matherr(&exc)) {
errno = ERANGE;
}
}
if (exc.err != 0)
errno = exc.err;
return (float)exc.retval;
} else
return y;
#endif
}
#ifdef _DOUBLE_IS_32BITS
#ifdef __STDC__
double lgamma(double x)
#else
double lgamma(x)
double x;
#endif
{
return (double) lgammaf((float) x);
}
#endif /* defined(_DOUBLE_IS_32BITS) */