| /* | |
| * Written by J.T. Conklin <jtc@netbsd.org>. | |
| * Public domain. | |
| * | |
| * Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>. | |
| */ | |
| #include <math_private.h> | |
| long double | |
| __ieee754_acosl (long double x) | |
| { | |
| long double res; | |
| /* acosl = atanl (sqrtl(1 - x^2) / x) */ | |
| asm ( "fld %%st\n" | |
| "fmul %%st(0)\n" /* x^2 */ | |
| "fld1\n" | |
| "fsubp\n" /* 1 - x^2 */ | |
| "fsqrt\n" /* sqrtl (1 - x^2) */ | |
| "fxch %%st(1)\n" | |
| "fpatan" | |
| : "=t" (res) : "0" (x) : "st(1)"); | |
| return res; | |
| } |