1 /**
2 * This file has no copyright assigned and is placed in the Public Domain.
3 * This file is part of the mingw-w64 runtime package.
4 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
5 */
6 /*
7 * Written by J.T. Conklin <jtc@netbsd.org>.
8 * Public domain.
9 * Adapted for long double type by Danny Smith <dannysmith@users.sourceforge.net>.
10 */
11
12 /* asin = atan (x / sqrt(1 - x^2)) */
13 long double asinl (long double x);
14
asinl(long double x)15 long double asinl (long double x)
16 {
17 long double res = 0.0L;
18
19 asm volatile (
20 "fld %%st\n\t"
21 "fmul %%st(0)\n\t" /* x^2 */
22 "fld1\n\t"
23 "fsubp\n\t" /* 1 - x^2 */
24 "fsqrt\n\t" /* sqrt (1 - x^2) */
25 "fpatan"
26 : "=t" (res) : "0" (x) : "st(1)");
27 return res;
28 }
29