ieee754sp.h
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上传日期:2013-02-24
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- /*
- * IEEE754 floating point
- * double precision internal header file
- */
- /*
- * 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 "ieee754int.h"
- #define assert(expr) ((void)0)
- /* 3bit extended single precision sticky right shift */
- #define SPXSRSXn(rs)
- (xe += rs,
- xm = (rs > (SP_MBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
- #define SPXSRSX1()
- (xe++, (xm = (xm >> 1) | (xm & 1)))
- #define SPXSRSYn(rs)
- (ye+=rs,
- ym = (rs > (SP_MBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
- #define SPXSRSY1()
- (ye++, (ym = (ym >> 1) | (ym & 1)))
- /* convert denormal to normalized with extended exponent */
- #define SPDNORMx(m,e)
- while( (m >> SP_MBITS) == 0) { m <<= 1; e--; }
- #define SPDNORMX SPDNORMx(xm,xe)
- #define SPDNORMY SPDNORMx(ym,ye)
- static __inline ieee754sp buildsp(int s, int bx, unsigned m)
- {
- ieee754sp r;
- assert((s) == 0 || (s) == 1);
- assert((bx) >= SP_EMIN - 1 + SP_EBIAS
- && (bx) <= SP_EMAX + 1 + SP_EBIAS);
- assert(((m) >> SP_MBITS) == 0);
- r.parts.sign = s;
- r.parts.bexp = bx;
- r.parts.mant = m;
- return r;
- }
- extern int ieee754sp_isnan(ieee754sp);
- extern int ieee754sp_issnan(ieee754sp);
- extern int ieee754si_xcpt(int, const char *, ...);
- extern long long ieee754di_xcpt(long long, const char *, ...);
- extern ieee754sp ieee754sp_xcpt(ieee754sp, const char *, ...);
- extern ieee754sp ieee754sp_nanxcpt(ieee754sp, const char *, ...);
- extern ieee754sp ieee754sp_bestnan(ieee754sp, ieee754sp);
- extern ieee754sp ieee754sp_format(int, int, unsigned);
- #define SPNORMRET2(s,e,m,name,a0,a1)
- {
- ieee754sp V = ieee754sp_format(s,e,m);
- if(TSTX())
- return ieee754sp_xcpt(V,name,a0,a1);
- else
- return V;
- }
- #define SPNORMRET1(s,e,m,name,a0) SPNORMRET2(s,e,m,name,a0,a0)