1/*
2 * Written by J.T. Conklin <jtc@netbsd.org>.
3 * Public domain.
4 *
5 * Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
6 */
7
8#include <math_private.h>
9
10long double
11__ieee754_acosl (long double x)
12{
13  long double res;
14
15  /* acosl = atanl (sqrtl(1 - x^2) / x) */
16  asm (	"fld	%%st\n"
17	"fmul	%%st(0)\n"		/* x^2 */
18	"fld1\n"
19	"fsubp\n"			/* 1 - x^2 */
20	"fsqrt\n"			/* sqrtl (1 - x^2) */
21	"fxch	%%st(1)\n"
22	"fpatan"
23	: "=t" (res) : "0" (x) : "st(1)");
24  return res;
25}
26