1/* s_rintf.c -- float version of s_rint.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16#include <sys/cdefs.h>
17__FBSDID("$FreeBSD$");
18
19#include <float.h>
20#include <stdint.h>
21
22#include "math.h"
23#include "math_private.h"
24
25static const float
26TWO23[2]={
27  8.3886080000e+06, /* 0x4b000000 */
28 -8.3886080000e+06, /* 0xcb000000 */
29};
30
31float
32rintf(float x)
33{
34	int32_t i0,j0,sx;
35	float w,t;
36	GET_FLOAT_WORD(i0,x);
37	sx = (i0>>31)&1;
38	j0 = ((i0>>23)&0xff)-0x7f;
39	if(j0<23) {
40	    if(j0<0) {
41		if((i0&0x7fffffff)==0) return x;
42		STRICT_ASSIGN(float,w,TWO23[sx]+x);
43	        t =  w-TWO23[sx];
44		GET_FLOAT_WORD(i0,t);
45		SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31));
46	        return t;
47	    }
48	    STRICT_ASSIGN(float,w,TWO23[sx]+x);
49	    return w-TWO23[sx];
50	}
51	if(j0==0x80) return x+x;	/* inf or NaN */
52	else return x;			/* x is integral */
53}
54