Copy from ldbl-96/w_expl.c with tweaked constants

sysdeps/ieee754/ldbl-128/w_expl.c

@@ -0,0 +1,58 @@
+/* w_expl.c -- long double version of w_exp.c.
+ * Conversion to long double by Ulrich Drepper,
+ * Cygnus Support, drepper@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * 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: $";
+#endif
+
+/*
+ * wrapper expl(x)
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+static const long double
+#else
+static long double
+#endif
+o_threshold= 1.1356523406294143949491931077970763428449E4L,
+u_threshold= -1.1433462743336297878837243843452621503410E4;
+
+#ifdef __STDC__
+	long double __expl(long double x)	/* wrapper exp */
+#else
+	long double __expl(x)			/* wrapper exp */
+	long double x;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_expl(x);
+#else
+	long double z;
+	z = __ieee754_expl(x);
+	if(_LIB_VERSION == _IEEE_) return z;
+	if(__finitel(x)) {
+	    if(x>o_threshold)
+	        return __kernel_standard(x,x,206); /* exp overflow */
+	    else if(x<u_threshold)
+	        return __kernel_standard(x,x,207); /* exp underflow */
+	}
+	return z;
+#endif
+}
+weak_alias (__expl, expl)