mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
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!
165 lines
3.8 KiB
C
165 lines
3.8 KiB
C
/*
|
|
* IEEE754 floating point
|
|
* common internal header file
|
|
*/
|
|
/*
|
|
* MIPS floating point support
|
|
* Copyright (C) 1994-2000 Algorithmics Ltd.
|
|
* 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 "ieee754.h"
|
|
|
|
#define DP_EBIAS 1023
|
|
#define DP_EMIN (-1022)
|
|
#define DP_EMAX 1023
|
|
#define DP_MBITS 52
|
|
|
|
#define SP_EBIAS 127
|
|
#define SP_EMIN (-126)
|
|
#define SP_EMAX 127
|
|
#define SP_MBITS 23
|
|
|
|
#define DP_MBIT(x) ((u64)1 << (x))
|
|
#define DP_HIDDEN_BIT DP_MBIT(DP_MBITS)
|
|
#define DP_SIGN_BIT DP_MBIT(63)
|
|
|
|
#define SP_MBIT(x) ((u32)1 << (x))
|
|
#define SP_HIDDEN_BIT SP_MBIT(SP_MBITS)
|
|
#define SP_SIGN_BIT SP_MBIT(31)
|
|
|
|
|
|
#define SPSIGN(sp) (sp.parts.sign)
|
|
#define SPBEXP(sp) (sp.parts.bexp)
|
|
#define SPMANT(sp) (sp.parts.mant)
|
|
|
|
#define DPSIGN(dp) (dp.parts.sign)
|
|
#define DPBEXP(dp) (dp.parts.bexp)
|
|
#define DPMANT(dp) (dp.parts.mant)
|
|
|
|
#define CLPAIR(x,y) ((x)*6+(y))
|
|
|
|
#define CLEARCX \
|
|
(ieee754_csr.cx = 0)
|
|
|
|
#define SETCX(x) \
|
|
(ieee754_csr.cx |= (x),ieee754_csr.sx |= (x))
|
|
|
|
#define SETANDTESTCX(x) \
|
|
(SETCX(x),ieee754_csr.mx & (x))
|
|
|
|
#define TSTX() \
|
|
(ieee754_csr.cx & ieee754_csr.mx)
|
|
|
|
|
|
#define COMPXSP \
|
|
unsigned xm; int xe; int xs; int xc
|
|
|
|
#define COMPYSP \
|
|
unsigned ym; int ye; int ys; int yc
|
|
|
|
#define EXPLODESP(v,vc,vs,ve,vm) \
|
|
{\
|
|
vs = SPSIGN(v);\
|
|
ve = SPBEXP(v);\
|
|
vm = SPMANT(v);\
|
|
if(ve == SP_EMAX+1+SP_EBIAS){\
|
|
if(vm == 0)\
|
|
vc = IEEE754_CLASS_INF;\
|
|
else if(vm & SP_MBIT(SP_MBITS-1)) \
|
|
vc = IEEE754_CLASS_SNAN;\
|
|
else \
|
|
vc = IEEE754_CLASS_QNAN;\
|
|
} else if(ve == SP_EMIN-1+SP_EBIAS) {\
|
|
if(vm) {\
|
|
ve = SP_EMIN;\
|
|
vc = IEEE754_CLASS_DNORM;\
|
|
} else\
|
|
vc = IEEE754_CLASS_ZERO;\
|
|
} else {\
|
|
ve -= SP_EBIAS;\
|
|
vm |= SP_HIDDEN_BIT;\
|
|
vc = IEEE754_CLASS_NORM;\
|
|
}\
|
|
}
|
|
#define EXPLODEXSP EXPLODESP(x,xc,xs,xe,xm)
|
|
#define EXPLODEYSP EXPLODESP(y,yc,ys,ye,ym)
|
|
|
|
|
|
#define COMPXDP \
|
|
u64 xm; int xe; int xs; int xc
|
|
|
|
#define COMPYDP \
|
|
u64 ym; int ye; int ys; int yc
|
|
|
|
#define EXPLODEDP(v,vc,vs,ve,vm) \
|
|
{\
|
|
vm = DPMANT(v);\
|
|
vs = DPSIGN(v);\
|
|
ve = DPBEXP(v);\
|
|
if(ve == DP_EMAX+1+DP_EBIAS){\
|
|
if(vm == 0)\
|
|
vc = IEEE754_CLASS_INF;\
|
|
else if(vm & DP_MBIT(DP_MBITS-1)) \
|
|
vc = IEEE754_CLASS_SNAN;\
|
|
else \
|
|
vc = IEEE754_CLASS_QNAN;\
|
|
} else if(ve == DP_EMIN-1+DP_EBIAS) {\
|
|
if(vm) {\
|
|
ve = DP_EMIN;\
|
|
vc = IEEE754_CLASS_DNORM;\
|
|
} else\
|
|
vc = IEEE754_CLASS_ZERO;\
|
|
} else {\
|
|
ve -= DP_EBIAS;\
|
|
vm |= DP_HIDDEN_BIT;\
|
|
vc = IEEE754_CLASS_NORM;\
|
|
}\
|
|
}
|
|
#define EXPLODEXDP EXPLODEDP(x,xc,xs,xe,xm)
|
|
#define EXPLODEYDP EXPLODEDP(y,yc,ys,ye,ym)
|
|
|
|
#define FLUSHDP(v,vc,vs,ve,vm) \
|
|
if(vc==IEEE754_CLASS_DNORM) {\
|
|
if(ieee754_csr.nod) {\
|
|
SETCX(IEEE754_INEXACT);\
|
|
vc = IEEE754_CLASS_ZERO;\
|
|
ve = DP_EMIN-1+DP_EBIAS;\
|
|
vm = 0;\
|
|
v = ieee754dp_zero(vs);\
|
|
}\
|
|
}
|
|
|
|
#define FLUSHSP(v,vc,vs,ve,vm) \
|
|
if(vc==IEEE754_CLASS_DNORM) {\
|
|
if(ieee754_csr.nod) {\
|
|
SETCX(IEEE754_INEXACT);\
|
|
vc = IEEE754_CLASS_ZERO;\
|
|
ve = SP_EMIN-1+SP_EBIAS;\
|
|
vm = 0;\
|
|
v = ieee754sp_zero(vs);\
|
|
}\
|
|
}
|
|
|
|
#define FLUSHXDP FLUSHDP(x,xc,xs,xe,xm)
|
|
#define FLUSHYDP FLUSHDP(y,yc,ys,ye,ym)
|
|
#define FLUSHXSP FLUSHSP(x,xc,xs,xe,xm)
|
|
#define FLUSHYSP FLUSHSP(y,yc,ys,ye,ym)
|