83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
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/*
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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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* 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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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/compiler.h>
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#include "ieee754int.h"
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#define assert(expr) ((void)0)
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#define DP_EBIAS 1023
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#define DP_EMIN (-1022)
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#define DP_EMAX 1023
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#define DP_FBITS 52
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#define DP_MBITS 52
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#define DP_MBIT(x) ((u64)1 << (x))
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#define DP_HIDDEN_BIT DP_MBIT(DP_FBITS)
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#define DP_SIGN_BIT DP_MBIT(63)
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#define DPSIGN(dp) (dp.sign)
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#define DPBEXP(dp) (dp.bexp)
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#define DPMANT(dp) (dp.mant)
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static inline int ieee754dp_finite(union ieee754dp x)
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{
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return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
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}
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/* 3bit extended double precision sticky right shift */
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#define XDPSRS(v,rs) \
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((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
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#define XDPSRSX1() \
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(xe++, (xm = (xm >> 1) | (xm & 1)))
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#define XDPSRS1(v) \
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(((v) >> 1) | ((v) & 1))
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/* convert denormal to normalized with extended exponent */
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#define DPDNORMx(m,e) \
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while ((m >> DP_FBITS) == 0) { m <<= 1; e--; }
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#define DPDNORMX DPDNORMx(xm, xe)
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#define DPDNORMY DPDNORMx(ym, ye)
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#define DPDNORMZ DPDNORMx(zm, ze)
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static inline union ieee754dp builddp(int s, int bx, u64 m)
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{
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union ieee754dp r;
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assert((s) == 0 || (s) == 1);
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assert((bx) >= DP_EMIN - 1 + DP_EBIAS
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&& (bx) <= DP_EMAX + 1 + DP_EBIAS);
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assert(((m) >> DP_FBITS) == 0);
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r.sign = s;
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r.bexp = bx;
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r.mant = m;
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return r;
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}
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extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp);
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extern union ieee754dp ieee754dp_format(int, int, u64);
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