diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_tanf.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_tanf.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_tanf.c b/sysdeps/libm-ieee754/s_tanf.c new file mode 100644 index 0000000..e8f6016 --- /dev/null +++ b/sysdeps/libm-ieee754/s_tanf.c @@ -0,0 +1,49 @@ +/* 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. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: s_tanf.c,v 1.4 1995/05/10 20:48:20 jtc Exp $"; +#endif + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ + float __tanf(float x) +#else + float __tanf(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 <= 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 */ + } +} +weak_alias (__tanf, tanf) |