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Re: Compiler slowdowns (was Re: [PATCH] Optimize manual byte swap implementations v2)


On Sat, Feb 7, 2009 at 12:43 AM, Bradley Lucier <lucier@math.purdue.edu> wrote:
> OK.
>
> Well, I'm seeing an -O1 compile (with some extra passes thrown in, like
> -fschedule-insn2) go from 168 seconds to 228.17 seconds in four months.
>  Without a nail to pound down.
>
> That's not directly related to -O2 times or whether bswap optimization is
> worth 1% compile time, but I'm guessing that a number of similar discussions
> went on (at least internally) about other patches over those four months,
> and we've ended up with a big difference.  (In the PR I noted a 13%
> difference just between September 19 and September 26 of last year.)
>
> I don't ever quite remember seeing such a rate of increase in compile time
> while I've been watching gcc development.

I can confirm this for CSiBE: http://gcc.opensuse.org/CSiBE/

Richard.

> Brad
>


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