1 files changed, 84 insertions, 0 deletions
diff --git a/libm/src/s_cosf.c b/libm/src/s_cosf.c
new file mode 100644
index 0000000..31adade
--- /dev/null
+++ b/libm/src/s_cosf.c
@@ -0,0 +1,84 @@
+/* s_cosf.c -- float version of s_cos.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 lint
+static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_cosf.c,v 1.15 2005/11/30 06:47:18 bde Exp $";
+#endif
+
+#include "math.h"
+#define	INLINE_KERNEL_COSDF
+#define	INLINE_KERNEL_SINDF
+#include "math_private.h"
+#include "k_cosf.c"
+#include "k_sinf.c"
+
+/* Small multiples of pi/2 rounded to double precision. */
+static const double
+c1pio2 = 1*M_PI_2,			/* 0x3FF921FB, 0x54442D18 */
+c2pio2 = 2*M_PI_2,			/* 0x400921FB, 0x54442D18 */
+c3pio2 = 3*M_PI_2,			/* 0x4012D97C, 0x7F3321D2 */
+c4pio2 = 4*M_PI_2;			/* 0x401921FB, 0x54442D18 */
+
+float
+cosf(float x)
+{
+	float y[2];
+	int32_t n, hx, ix;
+
+	GET_FLOAT_WORD(hx,x);
+	ix = hx & 0x7fffffff;
+
+	if(ix <= 0x3f490fda) {		/* |x| ~<= pi/4 */
+	    if(ix<0x39800000)		/* |x| < 2**-12 */
+		if(((int)x)==0) return 1.0;	/* 1 with inexact if x != 0 */
+	    return __kernel_cosdf(x);
+	}
+	if(ix<=0x407b53d1) {		/* |x| ~<= 5*pi/4 */
+	    if(ix>0x4016cbe3)		/* |x|  ~> 3*pi/4 */
+		return -__kernel_cosdf(x + (hx > 0 ? -c2pio2 : c2pio2));
+	    else {
+		if(hx>0)
+		    return __kernel_sindf(c1pio2 - x);
+		else
+		    return __kernel_sindf(x + c1pio2);
+	    }
+	}
+	if(ix<=0x40e231d5) {		/* |x| ~<= 9*pi/4 */
+	    if(ix>0x40afeddf)		/* |x|  ~> 7*pi/4 */
+		return __kernel_cosdf(x + (hx > 0 ? -c4pio2 : c4pio2));
+	    else {
+		if(hx>0)
+		    return __kernel_sindf(x - c3pio2);
+		else
+		    return __kernel_sindf(-c3pio2 - x);
+	    }
+	}
+
+    /* cos(Inf or NaN) is NaN */
+	else if (ix>=0x7f800000) return x-x;
+
+    /* general argument reduction needed */
+	else {
+	    n = __ieee754_rem_pio2f(x,y);
+	    switch(n&3) {
+		case 0: return  __kernel_cosdf((double)y[0]+y[1]);
+		case 1: return  __kernel_sindf(-(double)y[0]-y[1]);
+		case 2: return -__kernel_cosdf((double)y[0]+y[1]);
+		default:
+		        return  __kernel_sindf((double)y[0]+y[1]);
+	    }
+	}
+}