glibc/sysdeps/libm-i387/s_sin.S

/*
 * Written by J.T. Conklin <jtc@netbsd.org>.
 * Public domain.
 */

#include <machine/asm.h>

RCSID("$NetBSD: s_sin.S,v 1.5 1995/05/09 00:25:54 jtc Exp $")

ENTRY(__sin)
	fldl	4(%esp)
	fsin
	fnstsw	%ax
	testl	$0x400,%eax
	jnz	1f
	ret
1:	fldpi
	fadd	%st(0)
	fxch	%st(1)
2:	fprem1
	fnstsw	%ax
	testl	$0x400,%eax
	jnz	2b
	fstp	%st(1)
	fsin
	ret
END (__sin)
weak_alias (__sin, sin)