1 files changed, 40 insertions, 0 deletions
diff --git a/src/math/s_tanf.c b/src/math/s_tanf.c
new file mode 100644
index 00000000..660dd9c3
--- /dev/null
+++ b/src/math/s_tanf.c
@@ -0,0 +1,40 @@
+/* s_tanf.c -- float version of s_tan.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"
+
+float
+tanf(float x)
+{
+        float y[2],z=0.0;
+        int32_t n, ix;
+
+        GET_FLOAT_WORD(ix,x);
+
+    /* |x| ~< pi/4 */
+        ix &= 0x7fffffff;
+        if(ix <= 0x3f490fda) return __kernel_tanf(x,z,1);
+
+    /* tan(Inf or NaN) is NaN */
+        else if (ix>=0x7f800000) return x-x;            /* NaN */
+
+    /* argument reduction needed */
+        else {
+            n = __ieee754_rem_pio2f(x,y);
+            return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); /*   1 -- n even
+                                                              -1 -- n odd */
+        }
+}