NetBSD/lib/libm/arch/i387/e_acos.S

21 lines
373 B
ArmAsm

/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*/
#include <machine/asm.h>
RCSID("$NetBSD: e_acos.S,v 1.4 1995/05/08 23:44:37 jtc Exp $")
/* acos = atan (sqrt(1 - x^2) / x) */
ENTRY(__ieee754_acos)
fldl 4(%esp) /* x */
fst %st(1)
fmul %st(0) /* x^2 */
fld1
fsubp /* 1 - x^2 */
fsqrt /* sqrt (1 - x^2) */
fxch %st(1)
fpatan
ret