/* | |
* 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; | |
} |