Connor Abbott <cwabbo...@gmail.com> writes: > Before, when we encountered a situation where we had to optimistically > color a node, we would immediately give up and push all the remaining > nodes on the stack in the order of their index - which is a random, and > potentially not optimal, order. Instead, choose one node to > optimistically color in ra_select(), and then once we've optimistically > colored it, keep on going as normal in the hopes that we've opened up > more avenues for the normal select phase to make progress. In cases with > high register pressure, this helps make the order we push things on the > stack much better, and therefore increase the chance that we can allocate > successfully.
This makes a lot of sense, and the results speak for themselves. Let's figure out how to preserve "don't spill things that definitely won't help", and then land this.
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