| 1 | /* @(#)w_lgamma.c 5.1 93/09/24 */ |
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| 2 | /* |
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| 3 | * ==================================================== |
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| 4 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 5 | * |
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| 6 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 7 | * Permission to use, copy, modify, and distribute this |
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| 8 | * software is freely granted, provided that this notice |
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| 9 | * is preserved. |
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| 10 | * ==================================================== |
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| 11 | */ |
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| 12 | |
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| 13 | /* double lgamma(double x) |
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| 14 | * Return the logarithm of the Gamma function of x. |
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| 15 | * |
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| 16 | * Method: call __ieee754_lgamma_r |
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| 17 | */ |
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| 18 | |
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| 19 | #include <math.h> |
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| 20 | #include <math_private.h> |
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| 21 | #include <math-svid-compat.h> |
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| 22 | #include <libm-alias-double.h> |
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| 23 | |
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| 24 | #include <lgamma-compat.h> |
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| 25 | |
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| 26 | #if BUILD_LGAMMA |
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| 27 | double |
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| 28 | LGFUNC (__lgamma) (double x) |
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| 29 | { |
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| 30 | double y = CALL_LGAMMA (double, __ieee754_lgamma_r, x); |
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| 31 | if(__builtin_expect(!isfinite(y), 0) |
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| 32 | && isfinite(x) && _LIB_VERSION != _IEEE_) |
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| 33 | return __kernel_standard(x, x, |
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| 34 | floor(x)==x&&x<=0.0 |
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| 35 | ? 15 /* lgamma pole */ |
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| 36 | : 14); /* lgamma overflow */ |
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| 37 | |
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| 38 | return y; |
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| 39 | } |
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| 40 | # if USE_AS_COMPAT |
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| 41 | compat_symbol (libm, __lgamma_compat, lgamma, LGAMMA_OLD_VER); |
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| 42 | # ifdef NO_LONG_DOUBLE |
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| 43 | strong_alias (__lgamma_compat, __lgammal_compat) |
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| 44 | compat_symbol (libm, __lgammal_compat, lgammal, LGAMMA_OLD_VER); |
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| 45 | # endif |
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| 46 | # else |
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| 47 | versioned_symbol (libm, __lgamma, lgamma, LGAMMA_NEW_VER); |
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| 48 | # ifdef NO_LONG_DOUBLE |
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| 49 | strong_alias (__lgamma, __lgammal) |
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| 50 | versioned_symbol (libm, __lgammal, lgammal, LGAMMA_NEW_VER); |
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| 51 | # endif |
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| 52 | libm_alias_double_other (__lgamma, lgamma) |
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| 53 | # endif |
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| 54 | # if GAMMA_ALIAS |
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| 55 | strong_alias (LGFUNC (__lgamma), __gamma) |
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| 56 | weak_alias (__gamma, gamma) |
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| 57 | # ifdef NO_LONG_DOUBLE |
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| 58 | strong_alias (__gamma, __gammal) |
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| 59 | weak_alias (__gamma, gammal) |
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| 60 | # endif |
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| 61 | # endif |
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| 62 | #endif |
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| 63 | |
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