gcc subdir for combined gcc/ack library build

lib/gnu/ieee_float/isinf.c

@@ -0,0 +1,31 @@
+/*
+libc/ieee_float/isinf.c
+
+Created:	Oct 14, 1993 by Philip Homburg <philip@cs.vu.nl>
+
+Implementation of isinf that directly tests the bits in an ieee float
+*/
+
+#define _MINIX_SOURCE
+
+#include <sys/types.h>
+#include <math.h>
+
+#include "ieee_float.h"
+
+int isinf(value)
+double value;
+{
+	struct f64 *f64p;
+	int exp;
+
+	f64p= (struct f64 *)&value;
+	exp= F64_GET_EXP(f64p);
+	if (exp != F64_EXP_MAX)
+		return 0;
+	return F64_GET_MANT_LOW(f64p) == 0 && F64_GET_MANT_HIGH(f64p) == 0;
+}
+
+/*
+ * $PchId: isinf.c,v 1.3 1996/02/22 21:01:39 philip Exp $
+ */