1 /* e_asinf.c -- float version of e_asin.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 #include <sys/cdefs.h>
18 #include "math_private.h"
21 one = 1.0000000000e+00, /* 0x3F800000 */
23 /* coefficient for R(x^2) */
24 pS0 = 1.6666586697e-01,
25 pS1 = -4.2743422091e-02,
26 pS2 = -8.6563630030e-03,
27 qS1 = -7.0662963390e-01;
30 pio2 = 1.570796326794896558e+00;
40 if(ix>=0x3f800000) { /* |x| >= 1 */
41 if(ix==0x3f800000) /* |x| == 1 */
42 return x*pio2; /* asin(+-1) = +-pi/2 with inexact */
43 return (x-x)/(x-x); /* asin(|x|>1) is NaN */
44 } else if (ix<0x3f000000) { /* |x|<0.5 */
45 if(ix<0x39800000) { /* |x| < 2**-12 */
46 if(huge+x>one) return x;/* return x with inexact if x!=0*/
49 p = t*(pS0+t*(pS1+t*pS2));
57 p = t*(pS0+t*(pS1+t*pS2));
62 if(hx>0) return t; else return -t;