/*      $OpenBSD: s_tan.S,v 1.3 2016/09/12 19:47:02 guenther Exp $ */
/*
 * Written by J.T. Conklin <jtc@netbsd.org>.
 * Public domain.
 */

#include <machine/asm.h>

ENTRY(tan)
        fldl    4(%esp)
        fptan
        fnstsw  %ax
        andw    $0x400,%ax
        jnz     1f
        fstp    %st(0)
        ret
1:      fldpi
        fadd    %st(0)
        fxch    %st(1)
2:      fprem1
        fstsw   %ax
        andw    $0x400,%ax
        jnz     2b
        fstp    %st(1)
        fptan
        fstp    %st(0)
        ret
END(tan)