67 строки
1.8 KiB
C
67 строки
1.8 KiB
C
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/* IEEE754 floating point arithmetic
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* double precision: common utilities
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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 "ieee754dp.h"
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int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cmp, int sig)
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{
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COMPXDP;
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COMPYDP;
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EXPLODEXDP;
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EXPLODEYDP;
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FLUSHXDP;
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FLUSHYDP;
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CLEARCX; /* Even clear inexact flag here */
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if (ieee754dp_isnan(x) || ieee754dp_isnan(y)) {
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if (sig || xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN)
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SETCX(IEEE754_INVALID_OPERATION);
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if (cmp & IEEE754_CUN)
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return 1;
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if (cmp & (IEEE754_CLT | IEEE754_CGT)) {
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if (sig && SETANDTESTCX(IEEE754_INVALID_OPERATION))
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return ieee754si_xcpt(0, "fcmpf", x);
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}
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return 0;
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} else {
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s64 vx = x.bits;
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s64 vy = y.bits;
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if (vx < 0)
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vx = -vx ^ DP_SIGN_BIT;
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if (vy < 0)
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vy = -vy ^ DP_SIGN_BIT;
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if (vx < vy)
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return (cmp & IEEE754_CLT) != 0;
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else if (vx == vy)
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return (cmp & IEEE754_CEQ) != 0;
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else
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return (cmp & IEEE754_CGT) != 0;
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}
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}
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