1 /* s_tanf.c -- float version of s_tan.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
13 * ====================================================
16 #if defined(LIBM_SCCS) && !defined(lint)
17 static char rcsid[] = "$NetBSD: s_tanf.c,v 1.4 1995/05/10 20:48:20 jtc Exp $";
20 #include "math_private.h"
36 if(ix <= 0x3f490fda) return __kernel_tanf(x,z,1);
38 /* tan(Inf or NaN) is NaN */
39 else if (ix>=0x7f800000) return x-x; /* NaN */
41 /* argument reduction needed */
43 n = __ieee754_rem_pio2f(x,y);
44 return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); /* 1 -- n even
48 weak_alias (__tanf, tanf)