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https://github.com/edk2-porting/linux-next.git
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165 lines
4.2 KiB
C
165 lines
4.2 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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*
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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 __maybe_unused; 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 __maybe_unused; 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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