On 06/21/2016 11:12 PM, Bernd Edlinger wrote:
What I wanted to say here, is that lra goes thru several iterations,
changes something in the register allocation that has an impact on the
frame layout, typically 4-5 times, and calls INITIAL_ELIMINATION_OFFSET
3-4 times in a row, and in the results must be consistent in each
iteration to be usable.
So I am open to suggestions, how would you explain this idea in the doc?
I'm not sure :( The goal is still the same, you're trying to separate
the O(n) from the O(1) operations. So you want the COMPUTE_FRAME_LAYOUT
hook to be called once for things which don't vary and
INITIAL_ELIMINATION_OFFSET multiple times for things that do vary.
Thinking more about this, which port has has a particularly expensive
INITIAL_ELIMINATION_OFFSET?
Jeff
