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- /*
- * ====================================================
- * 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.
- * ====================================================
- */
- /* double gamma(double x)
- * Return the logarithm of the Gamma function of x or the Gamma function of x,
- * depending on the library mode.
- */
- #include "math.h"
- #include "math_private.h"
- double tgamma(double x)
- {
- double y;
- int local_signgam;
- y = __ieee754_gamma_r(x, &local_signgam);
- if (local_signgam < 0)
- y = -y;
- #ifndef _IEEE_LIBM
- if (_LIB_VERSION == _IEEE_)
- return y;
- if (!isfinite(y) && isfinite(x)) {
- if (floor(x) == x && x <= 0.0)
- return __kernel_standard(x, x, 41); /* tgamma pole */
- return __kernel_standard(x, x, 40); /* tgamma overflow */
- }
- #endif
- return y;
- }
- libm_hidden_def(tgamma)
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