1 /* s_tanf.c -- float version of s_tan.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 * $FreeBSD: src/lib/msun/src/s_tanf.c,v 1.5 1999/08/28 00:06:56 peter Exp $
5 * $DragonFly: src/lib/msun/src/Attic/s_tanf.c,v 1.4 2004/12/29 17:48:27 asmodai Exp $
9 * ====================================================
10 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
12 * Developed at SunPro, a Sun Microsystems, Inc. business.
13 * Permission to use, copy, modify, and distribute this
14 * software is freely granted, provided that this notice
16 * ====================================================
20 #include "math_private.h"
23 __generic_tanf(float x)
32 if(ix <= 0x3f490fda) return __kernel_tanf(x,z,1);
34 /* tan(Inf or NaN) is NaN */
35 else if (ix>=0x7f800000) return x-x; /* NaN */
37 /* argument reduction needed */
39 n = __ieee754_rem_pio2f(x,y);
40 return __kernel_tanf(y[0],y[1],1-((n&1)<<1)); /* 1 -- n even