1/* rintq.c -- __float128 version of s_rint.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
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/*
17 * rintq(x)
18 * Return x rounded to integral value according to the prevailing
19 * rounding mode.
20 * Method:
21 *	Using floating addition.
22 * Exception:
23 *	Inexact flag raised if x not equal to rintq(x).
24 */
25
26#include "quadmath-imp.h"
27
28static const __float128
29TWO112[2]={
30  5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */
31 -5.19229685853482762853049632922009600E+33Q  /* 0xC06F000000000000, 0 */
32};
33
34__float128
35rintq (__float128 x)
36{
37	int64_t i0,j0,sx;
38	uint64_t i1;
39	__float128 w,t;
40	GET_FLT128_WORDS64(i0,i1,x);
41	sx = (((uint64_t)i0)>>63);
42	j0 = ((i0>>48)&0x7fff)-0x3fff;
43	if(j0<112) {
44	    if(j0<0) {
45	        w = TWO112[sx]+x;
46	        t = w-TWO112[sx];
47		GET_FLT128_MSW64(i0,t);
48		SET_FLT128_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
49	        return t;
50	    }
51	} else {
52	    if(j0==0x4000) return x+x;	/* inf or NaN */
53	    else return x;		/* x is integral */
54	}
55	w = TWO112[sx]+x;
56	return w-TWO112[sx];
57}
58