89 строки
2.6 KiB
C
89 строки
2.6 KiB
C
/*
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* IEEE754 floating point
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* double precision internal header file
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*/
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/*
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* MIPS floating point support
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* Copyright (C) 1994-2000 Algorithmics Ltd.
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*
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* ########################################################################
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* ########################################################################
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*/
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#include "ieee754int.h"
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#define assert(expr) ((void)0)
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/* 3bit extended single precision sticky right shift */
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#define SPXSRSXn(rs) \
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(xe += rs, \
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xm = (rs > (SP_MBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
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#define SPXSRSX1() \
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(xe++, (xm = (xm >> 1) | (xm & 1)))
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#define SPXSRSYn(rs) \
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(ye+=rs, \
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ym = (rs > (SP_MBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
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#define SPXSRSY1() \
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(ye++, (ym = (ym >> 1) | (ym & 1)))
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/* convert denormal to normalized with extended exponent */
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#define SPDNORMx(m,e) \
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while( (m >> SP_MBITS) == 0) { m <<= 1; e--; }
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#define SPDNORMX SPDNORMx(xm, xe)
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#define SPDNORMY SPDNORMx(ym, ye)
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static inline ieee754sp buildsp(int s, int bx, unsigned m)
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{
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ieee754sp r;
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assert((s) == 0 || (s) == 1);
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assert((bx) >= SP_EMIN - 1 + SP_EBIAS
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&& (bx) <= SP_EMAX + 1 + SP_EBIAS);
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assert(((m) >> SP_MBITS) == 0);
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r.parts.sign = s;
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r.parts.bexp = bx;
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r.parts.mant = m;
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return r;
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}
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extern int ieee754sp_isnan(ieee754sp);
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extern int ieee754sp_issnan(ieee754sp);
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extern int ieee754si_xcpt(int, const char *, ...);
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extern s64 ieee754di_xcpt(s64, const char *, ...);
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extern ieee754sp ieee754sp_xcpt(ieee754sp, const char *, ...);
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extern ieee754sp ieee754sp_nanxcpt(ieee754sp, const char *, ...);
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extern ieee754sp ieee754sp_bestnan(ieee754sp, ieee754sp);
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extern ieee754sp ieee754sp_format(int, int, unsigned);
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#define SPNORMRET2(s, e, m, name, a0, a1) \
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{ \
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ieee754sp V = ieee754sp_format(s, e, m); \
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if(TSTX()) \
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return ieee754sp_xcpt(V, name, a0, a1); \
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else \
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return V; \
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}
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#define SPNORMRET1(s, e, m, name, a0) SPNORMRET2(s, e, m, name, a0, a0)
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