import newlib-2000-02-17 snapshot

1 files changed, 89 insertions, 0 deletions

diff --git a/newlib/libm/math/w_lgamma.c b/newlib/libm/math/w_lgamma.c
new file mode 100644
index 000000000..1dc63994f
--- /dev/null
+++ b/newlib/libm/math/w_lgamma.c
@@ -0,0 +1,89 @@
+
+/* @(#)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.
+ * ====================================================
+ *
+ */
+
+/* double lgamma(double x)
+ * Return the logarithm of the Gamma function of x.
+ *
+ * Method: call __ieee754_lgamma_r
+ */
+
+#include "fdlibm.h"
+#include <reent.h>
+#include <errno.h>
+
+#ifndef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double lgamma(double x)
+#else
+	double lgamma(x)
+	double x;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_lgamma_r(x,&(_REENT->_new._reent._gamma_signgam));
+#else
+        double y;
+	struct exception exc;
+        y = __ieee754_lgamma_r(x,&(_REENT->_new._reent._gamma_signgam));
+        if(_LIB_VERSION == _IEEE_) return y;
+        if(!finite(y)&&finite(x)) {
+#ifndef HUGE_VAL 
+#define HUGE_VAL inf
+	    double inf = 0.0;
+
+	    SET_HIGH_WORD(inf,0x7ff00000);	/* set inf to infinite */
+#endif
+	    exc.name = "lgamma";
+	    exc.err = 0;
+	    exc.arg1 = x;
+	    exc.arg2 = x;
+            if (_LIB_VERSION == _SVID_)
+               exc.retval = HUGE;
+            else
+               exc.retval = HUGE_VAL;
+	    if(floor(x)==x&&x<=0.0) {
+		/* lgamma(-integer) */
+		exc.type = SING;
+		if (_LIB_VERSION == _POSIX_)
+		   errno = EDOM;
+		else if (!matherr(&exc)) {
+		   errno = EDOM;
+		}
+
+            } else {
+		/* lgamma(finite) overflow */
+		exc.type = OVERFLOW;
+                if (_LIB_VERSION == _POSIX_)
+		   errno = ERANGE;
+                else if (!matherr(&exc)) {
+                   errno = ERANGE;
+		}
+            }
+	    if (exc.err != 0)
+	       errno = exc.err;
+            return exc.retval; 
+        } else
+            return y;
+#endif
+}             
+
+#endif /* defined(_DOUBLE_IS_32BITS) */
+
+
+
+
+
+
+