/*      $OpenBSD: s_cos.S,v 1.5 2018/07/08 12:49:16 mortimer Exp $ */
/*
 * Written by J.T. Conklin <jtc@NetBSD.org>.
 * Public domain.
 */

#include <machine/asm.h>

#include "abi.h"

ENTRY(cos)
        RETGUARD_SETUP(cos, r11)
        XMM_ONE_ARG_DOUBLE_PROLOGUE
        fldl    ARG_DOUBLE_ONE
        fcos
        fnstsw  %ax
        andw    $0x400,%ax
        jnz     1f
        XMM_DOUBLE_EPILOGUE
        RETGUARD_CHECK(cos, r11)
        ret     
1:      fldpi
        fadd    %st(0)
        fxch    %st(1)
2:      fprem1
        fnstsw  %ax
        andw    $0x400,%ax
        jnz     2b
        fstp    %st(1)
        fcos
        XMM_DOUBLE_EPILOGUE
        RETGUARD_CHECK(cos, r11)
        ret
END_STD(cos)