sp_simple.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:2k
- /* IEEE754 floating point arithmetic
- * single precision
- */
- /*
- * MIPS floating point support
- * Copyright (C) 1994-2000 Algorithmics Ltd. All rights reserved.
- * http://www.algor.co.uk
- *
- * ########################################################################
- *
- * This program is free software; you can distribute it and/or modify it
- * under the terms of the GNU General Public License (Version 2) as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
- *
- * ########################################################################
- */
- #include "ieee754sp.h"
- int ieee754sp_finite(ieee754sp x)
- {
- return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS;
- }
- ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y)
- {
- CLEARCX;
- SPSIGN(x) = SPSIGN(y);
- return x;
- }
- ieee754sp ieee754sp_neg(ieee754sp x)
- {
- COMPXSP;
- EXPLODEXSP;
- CLEARCX;
- FLUSHXSP;
- if (xc == IEEE754_CLASS_SNAN) {
- SETCX(IEEE754_INVALID_OPERATION);
- return ieee754sp_nanxcpt(ieee754sp_indef(), "neg");
- }
- if (ieee754sp_isnan(x)) /* but not infinity */
- return ieee754sp_nanxcpt(x, "neg", x);
- /* quick fix up */
- SPSIGN(x) ^= 1;
- return x;
- }
- ieee754sp ieee754sp_abs(ieee754sp x)
- {
- COMPXSP;
- EXPLODEXSP;
- CLEARCX;
- FLUSHXSP;
- if (xc == IEEE754_CLASS_SNAN) {
- SETCX(IEEE754_INVALID_OPERATION);
- return ieee754sp_nanxcpt(ieee754sp_indef(), "abs");
- }
- if (ieee754sp_isnan(x)) /* but not infinity */
- return ieee754sp_nanxcpt(x, "abs", x);
- /* quick fix up */
- SPSIGN(x) = 0;
- return x;
- }