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comparison libquadmath/math/ceilq.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_ceill.c -- long double version of s_ceil.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 huge = 1.0e4930Q;
19
20 __float128
21 ceilq (__float128 x)
22 {
23 int64_t i0,i1,j0;
24 uint64_t i,j;
25 GET_FLT128_WORDS64(i0,i1,x);
26 j0 = ((i0>>48)&0x7fff)-0x3fff;
27 if(j0<48) {
28 if(j0<0) { /* raise inexact if x != 0 */
29 if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
30 if(i0<0) {i0=0x8000000000000000ULL;i1=0;}
31 else if((i0|i1)!=0) { i0=0x3fff000000000000ULL;i1=0;}
32 }
33 } else {
34 i = (0x0000ffffffffffffULL)>>j0;
35 if(((i0&i)|i1)==0) return x; /* x is integral */
36 if(huge+x>0.0) { /* raise inexact flag */
37 if(i0>0) i0 += (0x0001000000000000LL)>>j0;
38 i0 &= (~i); i1=0;
39 }
40 }
41 } else if (j0>111) {
42 if(j0==0x4000) return x+x; /* inf or NaN */
43 else return x; /* x is integral */
44 } else {
45 i = -1ULL>>(j0-48);
46 if((i1&i)==0) return x; /* x is integral */
47 if(huge+x>0.0) { /* raise inexact flag */
48 if(i0>0) {
49 if(j0==48) i0+=1;
50 else {
51 j = i1+(1LL<<(112-j0));
52 if(j<i1) i0 +=1 ; /* got a carry */
53 i1=j;
54 }
55 }
56 i1 &= (~i);
57 }
58 }
59 SET_FLT128_WORDS64(x,i0,i1);
60 return x;
61 }