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/* $OpenBSD: s_tan.S,v 1.4 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"
ENTRY(tan)
RETGUARD_SETUP(tan, r11)
XMM_ONE_ARG_DOUBLE_PROLOGUE
fldl ARG_DOUBLE_ONE
fptan
fnstsw %ax
andw $0x400,%ax
jnz 1f
fstp %st(0)
XMM_DOUBLE_EPILOGUE
RETGUARD_CHECK(tan, r11)
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)
XMM_DOUBLE_EPILOGUE
RETGUARD_CHECK(tan, r11)
ret
END(tan)
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