92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
/*
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* This program source code file is part of KICAD, a free EDA CAD application.
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*
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* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (C) CERN
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* @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <cmath>
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#include <cstdlib>
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#include <climits>
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#include <math/math_util.h>
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template<>
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int rescale( int aNumerator, int aValue, int aDenominator )
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{
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return (int) ( (int64_t) aNumerator * (int64_t) aValue / (int64_t) aDenominator );
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}
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template<>
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int64_t rescale( int64_t aNumerator, int64_t aValue, int64_t aDenominator )
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{
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#ifdef __x86_64__
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return ( (__int128_t) aNumerator * (__int128_t) aValue ) / aDenominator;
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#else
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int64_t r = 0;
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int64_t sign = ( ( aNumerator < 0 ) ? -1 : 1 ) * ( aDenominator < 0 ? -1 : 1 ) *
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( aValue < 0 ? -1 : 1 );
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int64_t a = std::abs( aNumerator );
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int64_t b = std::abs( aValue );
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int64_t c = std::abs( aDenominator );
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r = c / 2;
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if( b <= INT_MAX && c <= INT_MAX )
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{
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if( a <= INT_MAX )
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return sign * ( ( a * b + r ) / c );
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else
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return sign * ( a / c * b + ( a % c * b + r ) / c);
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}
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else
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{
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uint64_t a0 = a & 0xFFFFFFFF;
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uint64_t a1 = a >> 32;
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uint64_t b0 = b & 0xFFFFFFFF;
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uint64_t b1 = b >> 32;
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uint64_t t1 = a0 * b1 + a1 * b0;
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uint64_t t1a = t1 << 32;
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int i;
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a0 = a0 * b0 + t1a;
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a1 = a1 * b1 + ( t1 >> 32 ) + ( a0 < t1a );
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a0 += r;
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a1 += a0 < (uint64_t)r;
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for( i = 63; i >= 0; i-- )
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{
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a1 += a1 + ( ( a0 >> i ) & 1 );
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t1 += t1;
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if( (uint64_t) c <= a1 )
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{
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a1 -= c;
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t1++;
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}
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}
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return t1 * sign;
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}
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#endif
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}
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