Re: 'Superoptimizers'

theoblit@wam.umd.edu (Jason Taylor)
Fri, 17 Nov 1995 04:37:54 GMT

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Newsgroups: comp.benchmarks,comp.compilers,comp.arch
From: theoblit@wam.umd.edu (Jason Taylor)
Keywords: optimize, performance
Organization: University of Maryland College Park
References: <47b2fl$d4l@news.ox.ac.uk> 95-11-080
Date: Fri, 17 Nov 1995 04:37:54 GMT

Andy Glew (glew@ichips.intel.com) wrote:
: (b) Used "compilation time" as a command line parameter. I.e. I wish
: I could say "take as long as 30 minutes to optimize, but not much
: longer" - and have the compiler quickly produce a quick and dirty
: code, and then refine it a few times by applying more and more
: optimizations.
: Rather than me, myself, figuring out by hand what compiler
: switches to turn on and off in order to properly balance compilation
: time and execution speed.


I couldn't agree more. Compilers should have a special mode where it
systematically determines what switches are best for a program. And
compile time should not be an issue at all if you use the, say, "-O4"
switch in stead of just "-O". Spec92 is the cause of a zillion
switches that no real scientist has time to care about. (I think that
only the equiv. of "-O" should have been allowed in spec95 for this
very reason, so that I don't pull out hairs wondering what I should do
to shave some time off a 3 hour run.)


______________________________________________________________________________
Jason Taylor, Greenbelt, MD USA
http://www.wam.umd.edu/~theoblit
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