Question

Given the following expression in C#, and that chunkWidth and chunkHeight are fixed pre-calculated numbers, is it possible to optimise the expression by perhaps pre-computing part of the modulo division beforehand?

// Once assigned these guys never change
private int _chunkWidth;
private int _chunkHeight;

// This function needs to be super optimal!
SomeObject LookupObject(int row, int column) {
    int index = (row % _chunkHeight) * _chunkWidth + (column % _chunkWidth);
    return _objects[ index ];
}

Answer 1

Even if chunkWidth and chunkHeight are fixed and pre-calculated fields, but still you cannot further optimize the modulo operation since row and column are variables which requires modulo operation each time the statement is executed.