e_acosf.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 23 行

/*
 * Written by J.T. Conklin <[e-mail]>.
 * Public domain.
 * Adapted for float type by Ulrich Drepper <[e-mail]>.
 */

#include <machine/asm.h>

RCSID("$NetBSD: $")

/* acos = atan (sqrt(1 - x^2) / x) */
ENTRY(__ieee754_acosf)
	flds	4(%esp)			/* x */
	fld	%st
	fmul	%st(0)			/* x^2 */
	fld1
	fsubp				/* 1 - x^2 */
	fsqrt				/* sqrt (1 - x^2) */
	fxch	%st(1)
	fpatan
	ret
END (__ieee754_acosf)