diff --git a/libm/src/k_sinf.c b/libm/src/k_sinf.c
new file mode 100644
index 0000000..e45dc42
--- /dev/null
+++ b/libm/src/k_sinf.c
@@ -0,0 +1,47 @@
+/* k_sinf.c -- float version of k_sin.c
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ * Optimized by Bruce D. Evans.
+ */
+
+/*
+ * ====================================================
+ * 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 INLINE_KERNEL_SINDF
+#ifndef lint
+static char rcsid[] = "$FreeBSD: src/lib/msun/src/k_sinf.c,v 1.13 2005/11/30 11:51:17 bde Exp $";
+#endif
+#endif
+
+#include "math.h"
+#include "math_private.h"
+
+/* |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]). */
+static const double
+S1 = -0x15555554cbac77.0p-55,	/* -0.166666666416265235595 */
+S2 =  0x111110896efbb2.0p-59,	/*  0.0083333293858894631756 */
+S3 = -0x1a00f9e2cae774.0p-65,	/* -0.000198393348360966317347 */
+S4 =  0x16cd878c3b46a7.0p-71;	/*  0.0000027183114939898219064 */
+
+#ifdef INLINE_KERNEL_SINDF
+extern inline
+#endif
+float
+__kernel_sindf(double x)
+{
+	double r, s, w, z;
+
+	/* Try to optimize for parallel evaluation as in k_tanf.c. */
+	z = x*x;
+	w = z*z;
+	r = S3+z*S4;
+	s = z*x;
+	return (x + s*(S1+z*S2)) + s*w*r;
+}