128 строки
3.9 KiB
C
128 строки
3.9 KiB
C
/* ieee754 floating point arithmetic
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* single and double precision
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*
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* BUGS
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* not much dp done
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* doesn't generate IEEE754_INEXACT
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*
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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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#include "ieee754sp.h"
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#include "ieee754dp.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 SP_EBIAS 127
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#define SP_EMIN (-126)
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#define SP_EMAX 127
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/* special constants
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*/
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#if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__)
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#define SPSTR(s, b, m) {m, b, s}
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#define DPSTR(s, b, mh, ml) {ml, mh, b, s}
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#endif
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#ifdef __MIPSEB__
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#define SPSTR(s, b, m) {s, b, m}
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#define DPSTR(s, b, mh, ml) {s, b, mh, ml}
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#endif
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const struct ieee754dp_konst __ieee754dp_spcvals[] = {
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DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* + zero */
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DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* - zero */
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DPSTR(0, DP_EBIAS, 0, 0), /* + 1.0 */
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DPSTR(1, DP_EBIAS, 0, 0), /* - 1.0 */
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DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0 */
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DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0 */
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DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* + infinity */
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DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* - infinity */
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DPSTR(0, DP_EMAX+1+DP_EBIAS, 0x7FFFF, 0xFFFFFFFF), /* + indef quiet Nan */
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DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* + max */
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DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* - max */
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DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */
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DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */
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DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* + min denormal */
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DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* - min denormal */
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DPSTR(0, 31 + DP_EBIAS, 0, 0), /* + 1.0e31 */
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DPSTR(0, 63 + DP_EBIAS, 0, 0), /* + 1.0e63 */
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};
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const struct ieee754sp_konst __ieee754sp_spcvals[] = {
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SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0), /* + zero */
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SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0), /* - zero */
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SPSTR(0, SP_EBIAS, 0), /* + 1.0 */
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SPSTR(1, SP_EBIAS, 0), /* - 1.0 */
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SPSTR(0, 3 + SP_EBIAS, 0x200000), /* + 10.0 */
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SPSTR(1, 3 + SP_EBIAS, 0x200000), /* - 10.0 */
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SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0), /* + infinity */
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SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0), /* - infinity */
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SPSTR(0, SP_EMAX+1+SP_EBIAS, 0x3FFFFF), /* + indef quiet Nan */
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SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* + max normal */
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SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* - max normal */
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SPSTR(0, SP_EMIN + SP_EBIAS, 0), /* + min normal */
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SPSTR(1, SP_EMIN + SP_EBIAS, 0), /* - min normal */
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SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1), /* + min denormal */
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SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1), /* - min denormal */
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SPSTR(0, 31 + SP_EBIAS, 0), /* + 1.0e31 */
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SPSTR(0, 63 + SP_EBIAS, 0), /* + 1.0e63 */
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};
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int ieee754si_xcpt(int r, const char *op, ...)
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{
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struct ieee754xctx ax;
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if (!TSTX())
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return r;
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ax.op = op;
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ax.rt = IEEE754_RT_SI;
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ax.rv.si = r;
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va_start(ax.ap, op);
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ieee754_xcpt(&ax);
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va_end(ax.ap);
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return ax.rv.si;
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}
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s64 ieee754di_xcpt(s64 r, const char *op, ...)
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{
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struct ieee754xctx ax;
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if (!TSTX())
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return r;
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ax.op = op;
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ax.rt = IEEE754_RT_DI;
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ax.rv.di = r;
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va_start(ax.ap, op);
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ieee754_xcpt(&ax);
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va_end(ax.ap);
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return ax.rv.di;
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}
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