KahanSum           81 3rdparty/openexr/Imath/ImathMatrixAlgo.cpp     KahanSum() : _total(0), _correction(0) {}
KahanSum          197 3rdparty/openexr/Imath/ImathMatrixAlgo.cpp         KahanSum traceATA;
KahanSum          209 3rdparty/openexr/Imath/ImathMatrixAlgo.cpp         KahanSum traceBATQ;