ack subdir for combined ack/gcc library build

lib/ack/float/adf4.fc

@@ -0,0 +1,32 @@
+/*
+  (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
+  See the copyright notice in the ACK home directory, in the file "Copyright".
+*/
+
+/* $Header$ */
+
+/*
+	ADD TWO FLOATS - SINGLE (ADF 4)
+*/
+
+#include	"FP_types.h"
+
+void
+adf4(s2,s1)
+SINGLE	s1,s2;
+{
+	EXTEND	e1,e2;
+	int	swap = 0;
+
+	if (s1 == (SINGLE) 0) {
+		s1 = s2;
+		return;
+	}
+	if (s2 == (SINGLE) 0) {
+		return;
+	}
+	extend(&s1,&e1,sizeof(SINGLE));
+	extend(&s2,&e2,sizeof(SINGLE));
+	add_ext(&e1,&e2);
+	compact(&e1,&s1,sizeof(SINGLE));
+}