s_tanl.s

来自「linux下的C语言库源码有一百多M解压后很不错」· S 代码 · 共 34 行

/*
 * Written by J.T. Conklin <[e-mail]>.
 * Public domain.
 *
 * Adapted for `long double' by Ulrich Drepper <[e-mail]>.
 * Adapted for x86-64 by Andreas Jaeger <[e-mail]>.
 */

#include <machine/asm.h>

RCSID("$NetBSD: $")

ENTRY(__tanl)
	fldt	8(%rsp)
	fptan
	fnstsw	%ax
	testl	$0x400,%eax
	jnz	1f
	fstp	%st(0)
	ret
1:	fldpi
	fadd	%st(0)
	fxch	%st(1)
2:	fprem1
	fstsw	%ax
	testl	$0x400,%eax
	jnz	2b
	fstp	%st(1)
	fptan
	fstp	%st(0)
	ret
END (__tanl)
weak_alias (__tanl, tanl)