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Re: [var-tracking] [not-good!] disable shared_hash and other simplifications
On Mon, Aug 22, 2011 at 1:54 PM, Jakub Jelinek <jakub@redhat.com> wrote:
>> * From a very wide field of view, all this DF solving reminded me a
>> lot of what I've seen in df-*.c. Why can't variable tracking be
>> integrated in the main DF pass of the compiler, the one that happens
>> *after* register allocation?
>
> I don't think there is any significant overlap. ?Yes, var-tracking is a data
> flow algorithm, but the code that does that is just a few lines, the big
> part is how the merges are done and how the tracking propagates through a
> basic block, and that has nothing in common with df-*.c.
But perhaps with the DF solver fewer blocks are visited...?
Ciao!
Steven