1*627f7eb2Smrg /* s_rintl.c -- long double version of s_rint.c.
2*627f7eb2Smrg * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
3*627f7eb2Smrg */
4*627f7eb2Smrg
5*627f7eb2Smrg /*
6*627f7eb2Smrg * ====================================================
7*627f7eb2Smrg * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8*627f7eb2Smrg *
9*627f7eb2Smrg * Developed at SunPro, a Sun Microsystems, Inc. business.
10*627f7eb2Smrg * Permission to use, copy, modify, and distribute this
11*627f7eb2Smrg * software is freely granted, provided that this notice
12*627f7eb2Smrg * is preserved.
13*627f7eb2Smrg * ====================================================
14*627f7eb2Smrg */
15*627f7eb2Smrg
16*627f7eb2Smrg #if defined(LIBM_SCCS) && !defined(lint)
17*627f7eb2Smrg static char rcsid[] = "NetBSD: ";
18*627f7eb2Smrg #endif
19*627f7eb2Smrg
20*627f7eb2Smrg /*
21*627f7eb2Smrg * rintq(x)
22*627f7eb2Smrg * Return x rounded to integral value according to the prevailing
23*627f7eb2Smrg * rounding mode.
24*627f7eb2Smrg * Method:
25*627f7eb2Smrg * Using floating addition.
26*627f7eb2Smrg * Exception:
27*627f7eb2Smrg * Inexact flag raised if x not equal to rintq(x).
28*627f7eb2Smrg */
29*627f7eb2Smrg
30*627f7eb2Smrg #define NO_MATH_REDIRECT
31*627f7eb2Smrg
32*627f7eb2Smrg #include "quadmath-imp.h"
33*627f7eb2Smrg
34*627f7eb2Smrg static const __float128
35*627f7eb2Smrg TWO112[2]={
36*627f7eb2Smrg 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */
37*627f7eb2Smrg -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */
38*627f7eb2Smrg };
39*627f7eb2Smrg
rintq(__float128 x)40*627f7eb2Smrg __float128 rintq(__float128 x)
41*627f7eb2Smrg {
42*627f7eb2Smrg int64_t i0,j0,sx;
43*627f7eb2Smrg uint64_t i1 __attribute__ ((unused));
44*627f7eb2Smrg __float128 w,t;
45*627f7eb2Smrg GET_FLT128_WORDS64(i0,i1,x);
46*627f7eb2Smrg sx = (((uint64_t)i0)>>63);
47*627f7eb2Smrg j0 = ((i0>>48)&0x7fff)-0x3fff;
48*627f7eb2Smrg if(j0<112) {
49*627f7eb2Smrg if(j0<0) {
50*627f7eb2Smrg w = TWO112[sx]+x;
51*627f7eb2Smrg t = w-TWO112[sx];
52*627f7eb2Smrg GET_FLT128_MSW64(i0,t);
53*627f7eb2Smrg SET_FLT128_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
54*627f7eb2Smrg return t;
55*627f7eb2Smrg }
56*627f7eb2Smrg } else {
57*627f7eb2Smrg if(j0==0x4000) return x+x; /* inf or NaN */
58*627f7eb2Smrg else return x; /* x is integral */
59*627f7eb2Smrg }
60*627f7eb2Smrg w = TWO112[sx]+x;
61*627f7eb2Smrg return w-TWO112[sx];
62*627f7eb2Smrg }
63