mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
30 lines
552 B
C
30 lines
552 B
C
/*
|
|
* 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) (1+x)) / x) */
|
|
asm ( "fld %%st\n"
|
|
"fld1\n"
|
|
"fsubp\n"
|
|
"fld1\n"
|
|
"fadd %%st(2)\n"
|
|
"fmulp\n" /* 1 - x^2 */
|
|
"fsqrt\n" /* sqrtl (1 - x^2) */
|
|
"fabs\n"
|
|
"fxch %%st(1)\n"
|
|
"fpatan"
|
|
: "=t" (res) : "0" (x) : "st(1)");
|
|
return res;
|
|
}
|
|
strong_alias (__ieee754_acosl, __acosl_finite)
|