1 /* origin: FreeBSD /usr/src/lib/msun/src/s_asinhf.c */
3 * 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 * ====================================================
19 ln2 = 6.9314718246e-01, /* 0x3f317218 */
20 huge= 1.0000000000e+30;
27 GET_FLOAT_WORD(hx, x);
29 if (ix >= 0x7f800000) /* x is inf or NaN */
31 if (ix < 0x31800000) { /* |x| < 2**-28 */
32 /* return x inexact except 0 */
36 if (ix > 0x4d800000) { /* |x| > 2**28 */
37 w = logf(fabsf(x)) + ln2;
38 } else if (ix > 0x40000000) { /* 2**28 > |x| > 2.0 */
40 w = logf(2.0f*t + 1.0f/(sqrtf(x*x+1.0f)+t));
41 } else { /* 2.0 > |x| > 2**-28 */
43 w =log1pf(fabsf(x) + t/(1.0f+sqrtf(1.0f+t)));