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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /math/w_lgamma.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
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+/* @(#)w_lgamma.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: w_lgamma.c,v 1.6 1995/05/10 20:49:24 jtc Exp $";
+#endif
+
+/* double lgamma(double x)
+ * Return the logarithm of the Gamma function of x.
+ *
+ * Method: call __ieee754_lgamma_r
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+#ifdef __STDC__
+ double __lgamma(double x)
+#else
+ double __lgamma(x)
+ double x;
+#endif
+{
+#ifdef _IEEE_LIBM
+ return __ieee754_lgamma_r(x,&signgam);
+#else
+ double y;
+ int local_signgam = 0;
+ y = __ieee754_lgamma_r(x,&local_signgam);
+ if (_LIB_VERSION != _ISOC_)
+ /* ISO C99 does not define the global variable. */
+ signgam = local_signgam;
+ if(_LIB_VERSION == _IEEE_) return y;
+ if(!__finite(y)&&__finite(x)) {
+ if(__floor(x)==x&&x<=0.0)
+ return __kernel_standard(x,x,15); /* lgamma pole */
+ else
+ return __kernel_standard(x,x,14); /* lgamma overflow */
+ } else
+ return y;
+#endif
+}
+weak_alias (__lgamma, lgamma)
+strong_alias (__lgamma, __gamma)
+weak_alias (__gamma, gamma)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__lgamma, __lgammal)
+weak_alias (__lgamma, lgammal)
+strong_alias (__gamma, __gammal)
+weak_alias (__gamma, gammal)
+#endif