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/* $OpenBSD: e_acos.S,v 1.3 2008/09/07 20:36:08 martynas Exp $ */
/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*/
#include <machine/asm.h>
/* acos = atan (sqrt(1 - x^2) / x) */
ENTRY(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
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