diff --git a/libm/src/s_copysignf.c b/libm/src/s_copysignf.c
new file mode 100644
index 0000000..79c4480
--- /dev/null
+++ b/libm/src/s_copysignf.c
@@ -0,0 +1,37 @@
+/* s_copysignf.c -- float version of s_copysign.c.
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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.
+ * ====================================================
+ */
+
+#ifndef lint
+static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_copysignf.c,v 1.9 2003/07/23 04:53:46 peter Exp $";
+#endif
+
+/*
+ * copysignf(float x, float y)
+ * copysignf(x,y) returns a value with the magnitude of x and
+ * with the sign bit of y.
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+float
+copysignf(float x, float y)
+{
+	u_int32_t ix,iy;
+	GET_FLOAT_WORD(ix,x);
+	GET_FLOAT_WORD(iy,y);
+	SET_FLOAT_WORD(x,(ix&0x7fffffff)|(iy&0x80000000));
+        return x;
+}