1 files changed, 47 insertions, 0 deletions
diff --git a/src/math/s_cosf.c b/src/math/s_cosf.c
new file mode 100644
index 00000000..14b8e98b
--- /dev/null
+++ b/src/math/s_cosf.c
@@ -0,0 +1,47 @@
+/* s_cosf.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 <math.h>
+#include "math_private.h"
+
+static const float one=1.0;
+
+float
+cosf(float x)
+{
+        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);
+            }
+        }
+}