Re: [PATCH, middle-end] Switch initializations conversion (take four)

[Jan Hubicka <hubicka at ucw dot cz>]

> > On Fri, Feb 29, 2008 at 12:07:05PM -0800, Mark Mitchell wrote:
> > > Optimization is a quantitative question: the whole point is to make the 
> > > program smaller, faster, etc.  So, all non-obvious optimization patches 
> > > should come with quantitative information, in addition to qualitative 
> > > information.
> > >
> > > In particular, which benchmark(s), on which platform(s), with which flags 
> > > did you use to measure improvement?  And how much improvement did you see?  
> > > And, what benchmark(s) on which platforms which which flags did you use to 
> > > measure costs?  And how high were the costs?
> > 
> > So far I have only managed to  find out how many and what switches get
> > converted during GCC bootstrap (this time all languages including ADA)
> > on i386 Linux. 177 conversions take  place (59 twice and 1 once during
> > the whole  process). The exact  switches as reported  by EXPR_LOCATION
> > are listed in http://misc.jamborm.net/cswtch.log  
> 
> Hi,
> I've dropped the patch to periodic tester (vangelis) for last 2 days.
> The compile time seems to be off noise (first CPU2000 build was 4
			       ^^ in ;)
> seconds slower, other 40 seconds faster than the build just before that
> might be result of mainline change) as are performance results.
> 
> There are some code size improvements, though interestingly GCC
> benchmark size grew from 2242->2246Kb (in peak so might be more
> inlining). Perl changes 938->935Kb, Mesa 692Kb->688Kb.
> 
> Honza