Re: cpplib: Separate out translation phases 1 and 2

[Devang Patel <dpatel at apple dot com>]

On Friday, April 18, 2003, at 05:18 PM, Neil Booth wrote:

> Neil Booth wrote:-
>
> > Actually, WTF, I think I'll do this, though like I said it's not 
> > really
> > a fair comparison.  I'll report the results tomorrow to "make 
> > bootstrap"
> > GCC before and after the patch with --enable-languages=c and
> > --disable-checking; the latter setting will also magnify any slowdown.
>
> After:
>
> real	31m32.023s
> user	28m36.130s
> sys	1m52.130s
>
> Before:
>
> real	30m55.332s
> user	28m18.960s
> sys	1m48.990s
>
> Which is 2% slowdown.  Since the new code doesn't take advantage of
> newly available optimizations, and also has baggage from the old way of
> doing things, it can only get better and I don't consider this a 
> blocker.

In large real life projects, we have seen that CPP is responsible for
larger portion of compiler time compared to its chunk while building
compiler. But that's OK. Now we have some idea about what to expect.

Plus now we know how much speed up we have to achieve with future
optimizations to reach original level.

And when somebody scream on us saying GCC 3.4 is slow than we know where
to start hunt if we keep such numbers for all important reorg/new 
features.

It is up to you and/or others to decide if this is a blocker or not.
I was just interested numbers.

Thank you very much,
-Devang