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87969c8c | 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 | } |