w_acoshf.c

来自「基于组件方式开发操作系统的OSKIT源代码」· C语言 代码 · 共 48 行

/* w_acoshf.c -- float version of w_acosh.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, [e-mail].
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 *
 */

#ifndef lint
static char rcsid[] = "$Id: w_acoshf.c,v 1.4 1997/02/22 15:11:52 peter Exp $";
#endif

/*
 * wrapper acoshf(x)
 */

#include "math.h"
#include "math_private.h"

#ifdef __STDC__
	float acoshf(float x)		/* wrapper acoshf */
#else
	float acoshf(x)			/* wrapper acoshf */
	float x;
#endif
{
#ifdef _IEEE_LIBM
	return __ieee754_acoshf(x);
#else
	float z;
	z = __ieee754_acoshf(x);
	if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
	if(x<(float)1.0) {
		/* acosh(x<1) */
	        return (float)__kernel_standard((double)x,(double)x,129);
	} else
	    return z;
#endif
}