- add some more math functions (patch from gentoo/solar)

1 files changed, 47 insertions, 0 deletions

diff --git a/libm/w_tgamma.c b/libm/w_tgamma.c
new file mode 100644
index 000000000..62b3c6275
--- /dev/null
+++ b/libm/w_tgamma.c
@@ -0,0 +1,47 @@
+/* @(#)w_gamma.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.
+ * ====================================================
+ */
+
+/* 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"
+
+libm_hidden_proto(tgamma)
+#ifdef __STDC__
+	double tgamma(double x)
+#else
+	double tgamma(x)
+	double x;
+#endif
+{
+        double y;
+	int local_signgam;
+	y = __ieee754_gamma_r(x,&local_signgam);
+	if (local_signgam < 0) y = -y;
+#ifdef _IEEE_LIBM
+	return y;
+#else
+	if(_LIB_VERSION == _IEEE_) return y;
+
+	if(!finite(y)&&finite(x)) {
+	  if(floor(x)==x&&x<=0.0)
+	    return __kernel_standard(x,x,41); /* tgamma pole */
+	  else
+	    return __kernel_standard(x,x,40); /* tgamma overflow */
+	}
+	return y;
+#endif
+}
+libm_hidden_def(tgamma)