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Re: IRA for GCC 4.4
Vladimir Makarov wrote:
Peter Bergner wrote:
On Mon, 2008-04-28 at 16:01 -0400, Vladimir Makarov wrote:
Thanks, Peter. That was clever and email is very enlightening. I
have analogous idea for more compact conflict matrix
representation. IRA builds allocno live ranges first (they are
ranges of program points where the allocno lives). I can use this
information for fast searching potential conflicts to sort the
allocnos. Probably the matrix will be even more compact because
live ranges contain more detail info than basic blocks where the
local allocnos live. For example, the ranges even can show that
allocnos local in the same block will never conflicts. It means
that matrix even for fppp can be compressed.
You say you use your analogous idea now? Can you point me to the code?
I thought I heard you (maybe someone else?) that your conflict
information
was much bigger than old mainline. If this is true and you are
compacting
the bit matrix like I am, why is it so big?
I am currently working on bit matrix compression. It is not
implemented yet. I hope it will be ready in a week.
vlad, this seems like the wrong way to go. i understand that you feel
that it is a sign of weakness to use someone else's fully debugged and
functional code rather than writing it from scratch, but every one else
feels that (a) you could better spend your time working on the other
issues that will be relevant to getting this thing in and (b) none of
the other reviewers looks forward to just seeing a lot of the same code
only different.
Kenny