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46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* w_gammal.c -- long double version of w_gamma.c.
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* Conversion to long double by Ulrich Drepper,
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* Cygnus Support, drepper@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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/* long double gammal(double x)
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* Return the Gamma function of x.
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*/
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#include <errno.h>
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#include <math.h>
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#include <math_private.h>
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long double
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__tgammal(long double x)
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{
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int local_signgam;
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long double y = __ieee754_gammal_r(x,&local_signgam);
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if(__glibc_unlikely (!isfinite (y) || y == 0)
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&& (isfinite (x) || isinf (x) < 0)
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&& _LIB_VERSION != _IEEE_) {
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if(x==0.0)
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return __kernel_standard_l(x,x,250); /* tgamma pole */
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else if(__floorl(x)==x&&x<0.0L)
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return __kernel_standard_l(x,x,241); /* tgamma domain */
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else if (y == 0)
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__set_errno (ERANGE); /* tgamma underflow */
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else
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return __kernel_standard_l(x,x,240); /* tgamma overflow */
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}
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return local_signgam < 0 ? - y : y;
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}
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weak_alias (__tgammal, tgammal)
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