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Re: Faster compilation speed

On Monday, August 12, 2002, at 12:43 PM, David S. Miller wrote:

   From: Matt Austern <>
   Date: Mon, 12 Aug 2002 12:47:30 -0700

   And yes, we're aware that many gains are possible only
   if we rewrite the parser or redesign the tree structure.  The
   only reason we haven't started on rewriting the parser is
   that someone else is already doing it.

So work on an attempt at RTL refcounting, the patch below is a place
to start.
Thanks for the pointer, that's a useful starting point.

But, at the risk of sounding like a broken record...  Do
we have benchmarks showing that RTL gc is one of
the major causes of slow compile speed?

At the moment, we're spending a lot of time doing
benchmarking and trying to figure out just where the
time is going.  I realize this has its limitations, that
poorly designed data structures may end up resulting
in tiny bits of overhead everywhere even if they never
show up in a profile.  But at least we can try to
understand what kinds of programs are especially
bad.  (One interesting fact, for example: one file that
we care a lot about takes twice as long to compile with
the C++ front end than with the C front end.)


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