1 //===========================================================================
5 // Part of the standard mathematical function library
7 //===========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
10 // This file is part of eCos, the Embedded Configurable Operating System.
11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
13 // eCos is free software; you can redistribute it and/or modify it under
14 // the terms of the GNU General Public License as published by the Free
15 // Software Foundation; either version 2 or (at your option) any later version.
17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 // You should have received a copy of the GNU General Public License along
23 // with eCos; if not, write to the Free Software Foundation, Inc.,
24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 // As a special exception, if other files instantiate templates or use macros
27 // or inline functions from this file, or you compile this file and link it
28 // with other works to produce a work based on this file, this file does not
29 // by itself cause the resulting work to be covered by the GNU General Public
30 // License. However the source code for this file must still be made available
31 // in accordance with section (3) of the GNU General Public License.
33 // This exception does not invalidate any other reasons why a work based on
34 // this file might be covered by the GNU General Public License.
36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
37 // at http://sources.redhat.com/ecos/ecos-license/
38 // -------------------------------------------
39 //####ECOSGPLCOPYRIGHTEND####
40 //===========================================================================
41 //#####DESCRIPTIONBEGIN####
43 // Author(s): jlarmour
44 // Contributors: jlarmour
50 //####DESCRIPTIONEND####
52 //===========================================================================
56 #include <pkgconf/libm.h> // Configuration header
58 // Include the Math library?
61 // Derived from code with the following copyright
64 /* @(#)s_rint.c 1.3 95/01/18 */
66 * ====================================================
67 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
69 * Developed at SunSoft, a Sun Microsystems, Inc. business.
70 * Permission to use, copy, modify, and distribute this
71 * software is freely granted, provided that this notice
73 * ====================================================
78 * Return x rounded to integral value according to the prevailing
81 * Using floating addition.
83 * Inexact flag raised if x not equal to rint(x).
86 #include "mathincl/fdlibm.h"
90 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
91 -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
102 j0 = ((i0>>20)&0x7ff)-0x3ff;
105 if(((i0&0x7fffffff)|i1)==0) return x;
108 i0 |= ((i1|-i1)>>12)&0x80000;
113 CYG_LIBM_HI(t) = (i0&0x7fffffff)|(sx<<31);
116 i = (0x000fffff)>>j0;
117 if(((i0&i)|i1)==0) return x; /* x is integral */
120 if(j0==19) i1 = 0x40000000; else
121 i0 = (i0&(~i))|((0x20000)>>j0);
125 if(j0==0x400) return x+x; /* inf or NaN */
126 else return x; /* x is integral */
128 i = ((unsigned)(0xffffffff))>>(j0-20);
129 if((i1&i)==0) return x; /* x is integral */
131 if((i1&i)!=0) i1 = (i1&(~i))|((0x40000000)>>(j0-20));
139 #endif // ifdef CYGPKG_LIBM