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-rw-r--r--libm/src/k_cosf.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/libm/src/k_cosf.c b/libm/src/k_cosf.c
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+/* k_cosf.c -- float version of k_cos.c
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ * Debugged and 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_COSDF
+#ifndef lint
+static char rcsid[] = "$FreeBSD: src/lib/msun/src/k_cosf.c,v 1.15 2005/11/30 11:51:17 bde Exp $";
+#endif
+#endif
+
+#include "math.h"
+#include "math_private.h"
+
+/* |cos(x) - c(x)| < 2**-34.1 (~[-5.37e-11, 5.295e-11]). */
+static const double
+one = 1.0,
+C0 = -0x1ffffffd0c5e81.0p-54, /* -0.499999997251031003120 */
+C1 = 0x155553e1053a42.0p-57, /* 0.0416666233237390631894 */
+C2 = -0x16c087e80f1e27.0p-62, /* -0.00138867637746099294692 */
+C3 = 0x199342e0ee5069.0p-68; /* 0.0000243904487962774090654 */
+
+#ifdef INLINE_KERNEL_COSDF
+extern inline
+#endif
+float
+__kernel_cosdf(double x)
+{
+ double r, w, z;
+
+ /* Try to optimize for parallel evaluation as in k_tanf.c. */
+ z = x*x;
+ w = z*z;
+ r = C2+z*C3;
+ return ((one+z*C0) + w*C1) + (w*z)*r;
+}