| 1 | /* w_gammal.c -- long double version of w_gamma.c. |
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| 2 | */ |
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| 3 | |
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| 4 | /* |
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| 5 | * ==================================================== |
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| 6 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 7 | * |
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| 8 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 9 | * Permission to use, copy, modify, and distribute this |
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| 10 | * software is freely granted, provided that this notice |
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| 11 | * is preserved. |
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| 12 | * ==================================================== |
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| 13 | */ |
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| 14 | |
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| 15 | /* long double gammal(double x) |
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| 16 | * Return the Gamma function of x. |
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| 17 | */ |
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| 18 | |
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| 19 | #include <errno.h> |
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| 20 | #include <math.h> |
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| 21 | #include <math_private.h> |
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| 22 | #include <math-svid-compat.h> |
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| 23 | #include <libm-alias-ldouble.h> |
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| 24 | |
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| 25 | #if LIBM_SVID_COMPAT |
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| 26 | long double |
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| 27 | __tgammal(long double x) |
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| 28 | { |
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| 29 | int local_signgam; |
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| 30 | long double y = __ieee754_gammal_r(x,&local_signgam); |
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| 31 | |
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| 32 | if(__glibc_unlikely (!isfinite (y) || y == 0) |
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| 33 | && (isfinite (x) || (isinf (x) && x < 0.0)) |
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| 34 | && _LIB_VERSION != _IEEE_) { |
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| 35 | if(x==0.0) |
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| 36 | return __kernel_standard_l(x,x,250); /* tgamma pole */ |
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| 37 | else if(floorl(x)==x&&x<0.0L) |
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| 38 | return __kernel_standard_l(x,x,241); /* tgamma domain */ |
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| 39 | else if (y == 0) |
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| 40 | __set_errno (ERANGE); /* tgamma underflow */ |
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| 41 | else |
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| 42 | return __kernel_standard_l(x,x,240); /* tgamma overflow */ |
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| 43 | } |
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| 44 | return local_signgam < 0 ? - y : y; |
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| 45 | } |
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| 46 | libm_alias_ldouble (__tgamma, tgamma) |
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| 47 | #endif |
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| 48 | |
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