1 /* nearbyintq.c -- __float128 version of s_nearbyint.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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
13 * ====================================================
18 * Return x rounded to integral value according to the prevailing
21 * Using floating addition.
23 * Inexact flag raised if x not equal to rintq(x).
26 #include "quadmath-imp.h"
29 # if defined HAVE_FEHOLDEXCEPT && defined HAVE_FESETENV
34 static const __float128
36 5.19229685853482762853049632922009600E+33Q
, /* 0x406F000000000000, 0 */
37 -5.19229685853482762853049632922009600E+33Q
/* 0xC06F000000000000, 0 */
41 nearbyintq(__float128 x
)
49 GET_FLT128_WORDS64(i0
,i1
,x
);
50 sx
= (((uint64_t)i0
)>>63);
51 j0
= ((i0
>>48)&0x7fff)-0x3fff;
54 if(((i0
&0x7fffffffffffffffLL
)|i1
)==0) return x
;
55 i1
|= (i0
&0x0000ffffffffffffLL
);
56 i0
&= 0xffffe00000000000ULL
;
57 i0
|= ((i1
|-i1
)>>16)&0x0000800000000000LL
;
58 SET_FLT128_MSW64(x
,i0
);
67 GET_FLT128_MSW64(i0
,t
);
68 SET_FLT128_MSW64(t
,(i0
&0x7fffffffffffffffLL
)|(sx
<<63));
71 i
= (0x0000ffffffffffffLL
)>>j0
;
72 if(((i0
&i
)|i1
)==0) return x
; /* x is integral */
75 if(j0
==47) i1
= 0x4000000000000000ULL
; else
76 i0
= (i0
&(~i
))|((0x0000200000000000LL
)>>j0
);
80 if(j0
==0x4000) return x
+x
; /* inf or NaN */
81 else return x
; /* x is integral */
84 if((i1
&i
)==0) return x
; /* x is integral */
86 if((i1
&i
)!=0) i1
= (i1
&(~i
))|((0x4000000000000000LL
)>>(j0
-48));
88 SET_FLT128_WORDS64(x
,i0
,i1
);