1*181254a7Smrg /* s_nearbyintl.c -- long double version of s_nearbyint.c.
2*181254a7Smrg * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
3*181254a7Smrg */
4*181254a7Smrg
5*181254a7Smrg /*
6*181254a7Smrg * ====================================================
7*181254a7Smrg * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8*181254a7Smrg *
9*181254a7Smrg * Developed at SunPro, a Sun Microsystems, Inc. business.
10*181254a7Smrg * Permission to use, copy, modify, and distribute this
11*181254a7Smrg * software is freely granted, provided that this notice
12*181254a7Smrg * is preserved.
13*181254a7Smrg * ====================================================
14*181254a7Smrg */
15*181254a7Smrg
16*181254a7Smrg /*
17*181254a7Smrg * nearbyintq(x)
18*181254a7Smrg * Return x rounded to integral value according to the prevailing
19*181254a7Smrg * rounding mode.
20*181254a7Smrg * Method:
21*181254a7Smrg * Using floating addition.
22*181254a7Smrg * Exception:
23*181254a7Smrg * Inexact flag raised if x not equal to rintq(x).
24*181254a7Smrg */
25*181254a7Smrg
26*181254a7Smrg #include "quadmath-imp.h"
27*181254a7Smrg
28*181254a7Smrg static const __float128
29*181254a7Smrg TWO112[2]={
30*181254a7Smrg 5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */
31*181254a7Smrg -5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */
32*181254a7Smrg };
33*181254a7Smrg
nearbyintq(__float128 x)34*181254a7Smrg __float128 nearbyintq(__float128 x)
35*181254a7Smrg {
36*181254a7Smrg fenv_t env;
37*181254a7Smrg int64_t i0,j0,sx;
38*181254a7Smrg uint64_t i1 __attribute__ ((unused));
39*181254a7Smrg __float128 w,t;
40*181254a7Smrg GET_FLT128_WORDS64(i0,i1,x);
41*181254a7Smrg sx = (((uint64_t)i0)>>63);
42*181254a7Smrg j0 = ((i0>>48)&0x7fff)-0x3fff;
43*181254a7Smrg if(j0<112) {
44*181254a7Smrg if(j0<0) {
45*181254a7Smrg feholdexcept (&env);
46*181254a7Smrg w = TWO112[sx] + math_opt_barrier (x);
47*181254a7Smrg t = w-TWO112[sx];
48*181254a7Smrg math_force_eval (t);
49*181254a7Smrg fesetenv (&env);
50*181254a7Smrg GET_FLT128_MSW64(i0,t);
51*181254a7Smrg SET_FLT128_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
52*181254a7Smrg return t;
53*181254a7Smrg }
54*181254a7Smrg } else {
55*181254a7Smrg if(j0==0x4000) return x+x; /* inf or NaN */
56*181254a7Smrg else return x; /* x is integral */
57*181254a7Smrg }
58*181254a7Smrg feholdexcept (&env);
59*181254a7Smrg w = TWO112[sx] + math_opt_barrier (x);
60*181254a7Smrg t = w-TWO112[sx];
61*181254a7Smrg math_force_eval (t);
62*181254a7Smrg fesetenv (&env);
63*181254a7Smrg return t;
64*181254a7Smrg }
65