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comparison libquadmath/math/rintq.c @ 68:561a7518be6b

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update gcc-4.6
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Sun, 21 Aug 2011 07:07:55 +0900
parents
children 04ced10e8804
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67:f6334be47118 68:561a7518be6b
1 /* s_rintl.c -- long double 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 #include "quadmath-imp.h"
17
18 static const __float128
19 TWO112[2]={
20 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */
21 -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */
22 };
23
24 __float128
25 rintq (__float128 x)
26 {
27 int64_t i0,j0,sx;
28 uint64_t i,i1;
29 __float128 w,t;
30 GET_FLT128_WORDS64(i0,i1,x);
31 sx = (((uint64_t)i0)>>63);
32 j0 = ((i0>>48)&0x7fff)-0x3fff;
33 if(j0<48) {
34 if(j0<0) {
35 if(((i0&0x7fffffffffffffffLL)|i1)==0) return x;
36 i1 |= (i0&0x0000ffffffffffffLL);
37 i0 &= 0xffffe00000000000ULL;
38 i0 |= ((i1|-i1)>>16)&0x0000800000000000LL;
39 SET_FLT128_MSW64(x,i0);
40 w = TWO112[sx]+x;
41 t = w-TWO112[sx];
42 GET_FLT128_MSW64(i0,t);
43 SET_FLT128_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
44 return t;
45 } else {
46 i = (0x0000ffffffffffffLL)>>j0;
47 if(((i0&i)|i1)==0) return x; /* x is integral */
48 i>>=1;
49 if(((i0&i)|i1)!=0) {
50 if(j0==47) i1 = 0x4000000000000000ULL; else
51 i0 = (i0&(~i))|((0x0000200000000000LL)>>j0);
52 }
53 }
54 } else if (j0>111) {
55 if(j0==0x4000) return x+x; /* inf or NaN */
56 else return x; /* x is integral */
57 } else {
58 i = -1ULL>>(j0-48);
59 if((i1&i)==0) return x; /* x is integral */
60 i>>=1;
61 if((i1&i)!=0) i1 = (i1&(~i))|((0x4000000000000000LL)>>(j0-48));
62 }
63 SET_FLT128_WORDS64(x,i0,i1);
64 w = TWO112[sx]+x;
65 return w-TWO112[sx];
66 }