1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
166 lines
3.8 KiB
C
166 lines
3.8 KiB
C
/*
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* IEEE754 floating point
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* common 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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* http://www.algor.co.uk
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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 "ieee754.h"
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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_MBITS 52
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#define SP_EBIAS 127
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#define SP_EMIN (-126)
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#define SP_EMAX 127
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#define SP_MBITS 23
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#define DP_MBIT(x) ((u64)1 << (x))
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#define DP_HIDDEN_BIT DP_MBIT(DP_MBITS)
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#define DP_SIGN_BIT DP_MBIT(63)
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#define SP_MBIT(x) ((u32)1 << (x))
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#define SP_HIDDEN_BIT SP_MBIT(SP_MBITS)
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#define SP_SIGN_BIT SP_MBIT(31)
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#define SPSIGN(sp) (sp.parts.sign)
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#define SPBEXP(sp) (sp.parts.bexp)
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#define SPMANT(sp) (sp.parts.mant)
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#define DPSIGN(dp) (dp.parts.sign)
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#define DPBEXP(dp) (dp.parts.bexp)
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#define DPMANT(dp) (dp.parts.mant)
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#define CLPAIR(x,y) ((x)*6+(y))
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#define CLEARCX \
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(ieee754_csr.cx = 0)
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#define SETCX(x) \
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(ieee754_csr.cx |= (x),ieee754_csr.sx |= (x))
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#define SETANDTESTCX(x) \
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(SETCX(x),ieee754_csr.mx & (x))
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#define TSTX() \
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(ieee754_csr.cx & ieee754_csr.mx)
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#define COMPXSP \
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unsigned xm; int xe; int xs; int xc
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#define COMPYSP \
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unsigned ym; int ye; int ys; int yc
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#define EXPLODESP(v,vc,vs,ve,vm) \
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{\
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vs = SPSIGN(v);\
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ve = SPBEXP(v);\
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vm = SPMANT(v);\
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if(ve == SP_EMAX+1+SP_EBIAS){\
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if(vm == 0)\
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vc = IEEE754_CLASS_INF;\
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else if(vm & SP_MBIT(SP_MBITS-1)) \
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vc = IEEE754_CLASS_SNAN;\
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else \
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vc = IEEE754_CLASS_QNAN;\
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} else if(ve == SP_EMIN-1+SP_EBIAS) {\
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if(vm) {\
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ve = SP_EMIN;\
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vc = IEEE754_CLASS_DNORM;\
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} else\
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vc = IEEE754_CLASS_ZERO;\
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} else {\
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ve -= SP_EBIAS;\
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vm |= SP_HIDDEN_BIT;\
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vc = IEEE754_CLASS_NORM;\
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}\
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}
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#define EXPLODEXSP EXPLODESP(x,xc,xs,xe,xm)
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#define EXPLODEYSP EXPLODESP(y,yc,ys,ye,ym)
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#define COMPXDP \
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u64 xm; int xe; int xs; int xc
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#define COMPYDP \
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u64 ym; int ye; int ys; int yc
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#define EXPLODEDP(v,vc,vs,ve,vm) \
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{\
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vm = DPMANT(v);\
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vs = DPSIGN(v);\
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ve = DPBEXP(v);\
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if(ve == DP_EMAX+1+DP_EBIAS){\
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if(vm == 0)\
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vc = IEEE754_CLASS_INF;\
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else if(vm & DP_MBIT(DP_MBITS-1)) \
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vc = IEEE754_CLASS_SNAN;\
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else \
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vc = IEEE754_CLASS_QNAN;\
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} else if(ve == DP_EMIN-1+DP_EBIAS) {\
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if(vm) {\
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ve = DP_EMIN;\
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vc = IEEE754_CLASS_DNORM;\
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} else\
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vc = IEEE754_CLASS_ZERO;\
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} else {\
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ve -= DP_EBIAS;\
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vm |= DP_HIDDEN_BIT;\
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vc = IEEE754_CLASS_NORM;\
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}\
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}
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#define EXPLODEXDP EXPLODEDP(x,xc,xs,xe,xm)
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#define EXPLODEYDP EXPLODEDP(y,yc,ys,ye,ym)
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#define FLUSHDP(v,vc,vs,ve,vm) \
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if(vc==IEEE754_CLASS_DNORM) {\
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if(ieee754_csr.nod) {\
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SETCX(IEEE754_INEXACT);\
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vc = IEEE754_CLASS_ZERO;\
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ve = DP_EMIN-1+DP_EBIAS;\
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vm = 0;\
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v = ieee754dp_zero(vs);\
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}\
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}
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#define FLUSHSP(v,vc,vs,ve,vm) \
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if(vc==IEEE754_CLASS_DNORM) {\
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if(ieee754_csr.nod) {\
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SETCX(IEEE754_INEXACT);\
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vc = IEEE754_CLASS_ZERO;\
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ve = SP_EMIN-1+SP_EBIAS;\
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vm = 0;\
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v = ieee754sp_zero(vs);\
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}\
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}
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#define FLUSHXDP FLUSHDP(x,xc,xs,xe,xm)
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#define FLUSHYDP FLUSHDP(y,yc,ys,ye,ym)
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#define FLUSHXSP FLUSHSP(x,xc,xs,xe,xm)
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#define FLUSHYSP FLUSHSP(y,yc,ys,ye,ym)
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