import newlib-2000-02-17 snapshot

1 files changed, 68 insertions, 0 deletions

diff --git a/newlib/libm/math/sf_cos.c b/newlib/libm/math/sf_cos.c
new file mode 100644
index 000000000..8f3a8af01
--- /dev/null
+++ b/newlib/libm/math/sf_cos.c
@@ -0,0 +1,68 @@
+/* sf_cos.c -- float version of s_cos.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.
+ * ====================================================
+ */
+
+#include "fdlibm.h"
+
+#ifdef __STDC__
+static const float one=1.0;
+#else
+static float one=1.0;
+#endif
+
+#ifdef __STDC__
+	float cosf(float x)
+#else
+	float cosf(x)
+	float x;
+#endif
+{
+	float y[2],z=0.0;
+	__int32_t n,ix;
+
+	GET_FLOAT_WORD(ix,x);
+
+    /* |x| ~< pi/4 */
+	ix &= 0x7fffffff;
+	if(ix <= 0x3f490fd8) return __kernel_cosf(x,z);
+
+    /* cos(Inf or NaN) is NaN */
+	else if (ix>=0x7f800000) return x-x;
+
+    /* argument reduction needed */
+	else {
+	    n = __ieee754_rem_pio2f(x,y);
+	    switch(n&3) {
+		case 0: return  __kernel_cosf(y[0],y[1]);
+		case 1: return -__kernel_sinf(y[0],y[1],1);
+		case 2: return -__kernel_cosf(y[0],y[1]);
+		default:
+		        return  __kernel_sinf(y[0],y[1],1);
+	    }
+	}
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double cos(double x)
+#else
+	double cos(x)
+	double x;
+#endif
+{
+	return (double) cosf((float) x);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */