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Re: Will tree-ssa be GCC 3.5?
- From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- To: steven at gcc dot gnu dot org
- Cc: gcc at gcc dot gnu dot org
- Date: Mon, 1 Dec 03 10:15:12 EST
- Subject: Re: Will tree-ssa be GCC 3.5?
Do you really believe that so many work full time on research
projects?
Sure. I was part of a research project at NYU that had about 15 full-time
people. Drug companies have thousands of people working on drug research.
Just because Ada hasn't caught up with the rest of GCC
doesn't mean that the work done for other languages is not intended
for a production environment.
It has nothing to do with Ada.
The question of to what extent optimizations will be improved by doing
them at a higher level is one that can only be answered by doing them.
Likewise for the cost of such optimizations.
There are quite a few unanswered questions about exactly how the
lowering passes should operate and what they should lower and when.
The proposal is to decide these issues by experimentation. I call
that approach "research". Sure it's "intended for a production
environment", but that doesn't make it any less a "research project".
There has been a lot of speculation, but nobody can say with certainty
whether or to what extent any of the current RTL optimizers can be removed
without losing significant code performance, for another example.