Writing Expressions in MAD Form

To take advantage of the USC cores, write math expressions in MAD form

To take advantage of the USC cores, it is essential to always write math expressions in Multiply-Add form (MAD form).

For example, changing the following expression to use the MAD form results in a 50% cycle cost reduction:

fragColor.x = (t.x + t.y) * (t.x - t.y); // two cycles
{sop, sop, sopmov}
{sop, sop}
-->
fragColor.x = t.x * t.x + (-t.y * t.y); // one cycle
{sop, sop}