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Try using the scaleAdd function. It has SMID optimizations built in.

cv::Mat sum = cv::Mat::zeros( mats[0].rows, mats[0].cols, cvType );
for( int m = 0; m < mats.size(); m++ )
{
     const Type val = rowVec.at< Type >( m );
     cv::scaleAdd(mats[m], val, sum, sum);
}

Try using the scaleAdd function. It has SMID optimizations built in.

cv::Mat sum = cv::Mat::zeros( mats[0].rows, mats[0].cols, cvType );
for( int m = 0; m < mats.size(); m++ )
{
     const Type val = rowVec.at< Type >( m );
     cv::scaleAdd(mats[m], val, sum, sum);
}