dp_cmp.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
- * 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_cmp(ieee754dp x, ieee754dp y, int cmp, int sig)
- {
- COMPXDP;
- COMPYDP;
- EXPLODEXDP;
- EXPLODEYDP;
- FLUSHXDP;
- FLUSHYDP;
- CLEARCX; /* Even clear inexact flag here */
- if (ieee754dp_isnan(x) || ieee754dp_isnan(y)) {
- if (sig || xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN)
- SETCX(IEEE754_INVALID_OPERATION);
- if (cmp & IEEE754_CUN)
- return 1;
- if (cmp & (IEEE754_CLT | IEEE754_CGT)) {
- if (sig && SETCX(IEEE754_INVALID_OPERATION))
- return ieee754si_xcpt(0, "fcmpf", x);
- }
- return 0;
- } else {
- s64 vx = x.bits;
- s64 vy = y.bits;
- if (vx < 0)
- vx = -vx ^ DP_SIGN_BIT;
- if (vy < 0)
- vy = -vy ^ DP_SIGN_BIT;
- if (vx < vy)
- return (cmp & IEEE754_CLT) != 0;
- else if (vx == vy)
- return (cmp & IEEE754_CEQ) != 0;
- else
- return (cmp & IEEE754_CGT) != 0;
- }
- }