[Mesa-dev] [PATCH v2 3/4] ra: consider all spillable nodes for spilling

[Eric Anholt]

Connor Abbott <cwabbott0 at gmail.com> writes:
> That's not necessarily true - you could want to spill a trivially
> colored register that interferes with a non trivially colored
> register, especially if the spill cost of the non trivially colored
> register is higher than that of the trivially colored register because
> e.g. the non trivially colored register is used in a loop. Especially,
> I ran into trouble with the varying packing tests in piglit which
> after a few rounds of spilling looked something like:

If it's trivially colorable, then when you're trying to get a
non-conflicting color for a difficult neighbor (an optimistic-coloring
one near the top of the stack that's triggering the need for spilling),
it's out consideration because it's deeper in the stack.
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