[rbultje]

> I sure hope a broader exploration precedes micro-optimizing register allocation and calling conventions.

It should be obvious that both are pursued independently whenever it makes sense. The idea that one should precede the other or is more important than the other is simply untrue.

[janwas]

How can tuning be independent of devising the algorithm?

Are you really suggesting writing a variant of a kernel, tuning it to the max, then discovering a new and different way to do it, and then discarding the first implementation? That seems like a lot of wasted effort.