Commit b688f9bc authored by Tomasz Wlostowski's avatar Tomasz Wlostowski Committed by Maciej Suminski
Browse files

math_util: speed up rescaling on 64-bit platforms by using native 128-bit types

parent 655721d9

common/math/math_util.cpp

+8 −3
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <cstdlib>

#include <climits>

#include <math/math_util.h>

#include <stdint.h>



template<>

int rescale( int aNumerator, int aValue, int aDenominator )
@@ -38,6 +39,9 @@ int rescale( int aNumerator, int aValue, int aDenominator ) 
template<>

int64_t rescale( int64_t aNumerator, int64_t aValue, int64_t aDenominator )

{

#ifdef __x86_64__

    return ( (__int128_t) aNumerator * (__int128_t) aValue ) / aDenominator;

#else

    int64_t r = 0;

    int64_t sign = ( ( aNumerator < 0 ) ? -1 : 1 ) * ( aDenominator < 0 ? -1 : 1 ) *

                                                     ( aValue < 0 ? -1 : 1 );
@@ -84,4 +88,5 @@ int64_t rescale( int64_t aNumerator, int64_t aValue, int64_t aDenominator ) 


        return t1 * sign;

    }

#endif

}