dp_simple.c
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上传日期:2013-02-24
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文件大小:2k
- /* IEEE754 floating point arithmetic
- * double precision: common utilities
- */
- /*
- * 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 "ieee754dp.h"
- int ieee754dp_finite(ieee754dp x)
- {
- return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
- }
- ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y)
- {
- CLEARCX;
- DPSIGN(x) = DPSIGN(y);
- return x;
- }
- ieee754dp ieee754dp_neg(ieee754dp x)
- {
- CLEARCX;
- if (ieee754dp_isnan(x)) /* but not infinity */
- return ieee754dp_nanxcpt(x, "neg", x);
- /* quick fix up */
- DPSIGN(x) ^= 1;
- return x;
- }
- ieee754dp ieee754dp_abs(ieee754dp x)
- {
- CLEARCX;
- if (ieee754dp_isnan(x)) /* but not infinity */
- return ieee754dp_nanxcpt(x, "abs", x);
- /* quick fix up */
- DPSIGN(x) = 0;
- return x;
- }