sysdeps/libm-i387/e_asin.S

   1 /*
   2  * Written by J.T. Conklin <jtc@netbsd.org>.
   3  * Public domain.
   4  */
   5
   6 #include <machine/asm.h>
   7
   8 RCSID("$NetBSD: e_asin.S,v 1.4 1995/05/08 23:45:40 jtc Exp $")
   9
  10 /* asin = atan (x / sqrt(1 - x^2)) */
  11 ENTRY(__ieee754_asin)
  12         fldl    4(%esp)                 /* x */
  13         fst     %st(1)
  14         fmul    %st(0)                  /* x^2 */
  15         fld1
  16         fsubp                           /* 1 - x^2 */
  17         fsqrt                           /* sqrt (1 - x^2) */
  18         fpatan
  19         ret