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/* $OpenBSD: e_acos.S,v 1.6 2018/07/03 22:43:34 mortimer Exp $ */
/*
* Written by J.T. Conklin <jtc@NetBSD.org>.
* Public domain.
*/
#include <machine/asm.h>
#include "abi.h"
/* acos = atan (sqrt(1 - x^2) / x) */
ENTRY(acos)
RETGUARD_SETUP(acos, r11)
XMM_ONE_ARG_DOUBLE_PROLOGUE
fldl ARG_DOUBLE_ONE /* x */
fld %st(0)
fmul %st(0) /* x^2 */
fld1
fsubp /* 1 - x^2 */
fsqrt /* sqrt (1 - x^2) */
fxch %st(1)
fpatan
XMM_DOUBLE_EPILOGUE
RETGUARD_CHECK(acos, r11)
ret
END(acos)
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