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
18#include <float.h>
19#include <stdint.h>
20
21#include "../bsd_private_base.h"
22
23static const float
24TWO23[2]={
25  8.3886080000e+06, /* 0x4b000000 */
26 -8.3886080000e+06, /* 0xcb000000 */
27};
28
29float
30rintf(float x)
31{
32	int32_t i0,j0,sx;
33	float w,t;
34	GET_FLOAT_WORD(i0,x);
35	sx = (i0>>31)&1;
36	j0 = ((i0>>23)&0xff)-0x7f;
37	if(j0<23) {
38	    if(j0<0) {
39		if((i0&0x7fffffff)==0) return x;
40		STRICT_ASSIGN(float,w,TWO23[sx]+x);
41	        t =  w-TWO23[sx];
42		GET_FLOAT_WORD(i0,t);
43		SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31));
44	        return t;
45	    }
46	    STRICT_ASSIGN(float,w,TWO23[sx]+x);
47	    return w-TWO23[sx];
48	}
49	if(j0==0x80) return x+x;	/* inf or NaN */
50	else return x;			/* x is integral */
51}