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Re: Bootstrap time regressions
- From: Steven Bosscher <stevenb at suse dot de>
- To: gcc at gcc dot gnu dot org
- Cc: Greg Schafer <gschafer at zip dot com dot au>
- Date: Fri, 7 Jan 2005 01:13:57 +0100
- Subject: Re: Bootstrap time regressions
- Organization: SUSE Labs
- References: <20050107000718.GA16432@tigers-lfs.nsw.bigpond.net.au>
On Friday 07 January 2005 01:07, Greg Schafer wrote:
> 1) STAGE1_CHECKING slows down C only bootstraps by up to 19.5% (on my
> setup at least)
But at least you can be sure that your compiler works as expected. The
internal consistency checking is there for your own safety.
> 2) C only bootstrap times with GCC-4 have almost exactly doubled since
> 3.4.3 (again, on my setup at least)
C only bootstrap compile roughly twice as much code as before, so this
is not so surprising.
> I guess I'm asking if anyone else thinks that STAGE1_CHECKING should be
> switched off in the released 4.0 compiler in the face of hard numbers?
I don't see any real reason to turn it off. I don't know how often
you would bootstrap a release compiler, but I'd hope at most once. So
you take a small overhead once, when you build the compiler. Why is
that such a big deal for you?
Gr.
Steven