70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* These math functions are taken from newlib-nano-2, the newlib/libm/math
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* directory, available from https://github.com/32bitmicro/newlib-nano-2.
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*
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* Appropriate copyright headers are reproduced below.
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*/
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/* w_gammaf.c -- float version of w_gamma.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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#include "math.h"
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#include "fdlibm.h"
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#define _IEEE_LIBM 1
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#ifdef __STDC__
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float tgammaf(float x)
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#else
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float tgammaf(x)
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float x;
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#endif
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{
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float y;
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int local_signgam;
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y = expf(__ieee754_lgammaf_r(x,&local_signgam));
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if (local_signgam < 0) y = -y;
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#ifdef _IEEE_LIBM
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return y;
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#else
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if(_LIB_VERSION == _IEEE_) return y;
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if(!finitef(y)&&finitef(x)) {
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if(floorf(x)==x&&x<=(float)0.0)
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/* tgammaf pole */
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return (float)__kernel_standard((double)x,(double)x,141);
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else
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/* tgammaf overflow */
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return (float)__kernel_standard((double)x,(double)x,140);
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}
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return y;
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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 tgamma(double x)
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#else
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double tgamma(x)
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double x;
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#endif
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{
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return (double) tgammaf((float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */
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