Re: High Level Language vs Assembly

Matt wrote:


> I would think talking about how good compilers are in this news group
> is like singing to the choir, so let me ask this; how much improvement
> is there between non-optimized and highly optimized code?


Days before the EGCS project started in August '97, I sent off an
e-mail to RMS and Richard Kenner (then maintainter of gcc) about my
"improvements" to the gcc-heuristics w.r.t. to loop optimisation.


On the 25 Mhz 68040 system I owned at that time, the changes made a
factor of 3 difference with regard to the standard gcc heuristics on a
simple 750-line Fortran benchmark.


This is not even between "non-optimised" and "optimised" code, it's
between "-O2" (vanilla) and "-O2" (tuned).


Definitely, in the Real World, larger differences are attainable.
--
Toon Moene - mailto:toon@moene.indiv.nluug.nl - phoneto: +31 346 214290
Saturnushof 14, 3738 XG Maartensdijk, The Netherlands
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