w_hypotf.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_hypotf.c -- float version of w_hypot.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_hypotf.c,v 1.2 1995/05/30 05:51:15 rgrimes Exp $";
#endif

/*
 * wrapper hypotf(x,y)
 */

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


#ifdef __STDC__
	float hypotf(float x, float y)	/* wrapper hypotf */
#else
	float hypotf(x,y)		/* wrapper hypotf */
	float x,y;
#endif
{
#ifdef _IEEE_LIBM
	return __ieee754_hypotf(x,y);
#else
	float z;
	z = __ieee754_hypotf(x,y);
	if(_LIB_VERSION == _IEEE_) return z;
	if((!finitef(z))&&finitef(x)&&finitef(y))
	    /* hypot overflow */
	    return (float)__kernel_standard((double)x,(double)y,104);
	else
	    return z;
#endif
}