about summary refs log tree commit diff
path: root/sysdeps/libm-ieee754/w_atanh.c
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/libm-ieee754/w_atanh.c')
-rw-r--r--sysdeps/libm-ieee754/w_atanh.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/w_atanh.c b/sysdeps/libm-ieee754/w_atanh.c
new file mode 100644
index 0000000000..43f5ff79fd
--- /dev/null
+++ b/sysdeps/libm-ieee754/w_atanh.c
@@ -0,0 +1,48 @@
+/* @(#)w_atanh.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_atanh.c,v 1.6 1995/05/10 20:48:43 jtc Exp $";
+#endif
+
+/* 
+ * wrapper atanh(x)
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+
+#ifdef __STDC__
+	double __atanh(double x)		/* wrapper atanh */
+#else
+	double __atanh(x)			/* wrapper atanh */
+	double x;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_atanh(x);
+#else
+	double z,y;
+	z = __ieee754_atanh(x);
+	if(_LIB_VERSION == _IEEE_ || __isnan(x)) return z;
+	y = fabs(x);
+	if(y>=1.0) {
+	    if(y>1.0)
+	        return __kernel_standard(x,x,30); /* atanh(|x|>1) */
+	    else 
+	        return __kernel_standard(x,x,31); /* atanh(|x|==1) */
+	} else
+	    return z;
+#endif
+}
+weak_alias (__atanh, atanh)