Re: [PATCH] Improve cost computations in IVOPTS

[Zdenek Dvorak <rakdver at kam dot mff dot cuni dot cz>]

Hi,

> > assuming that compile time and memory consumption are not significantly
> > affected by this (and other similar) changes -- ivopts tries rather hard
> > to avoid folding things and creating new expressions in the phase of the
> > computation of the costs, as I used to run into problems with memory
> > requirements otherwise.
> 
> Note that the pass already folds during cost computation (strip_offset_1).
> That's pretty much unavoidable I think, otherwise the discrepancy would be too 
> big between the computed costs and the costs of the generated expressions.
> 
> I've tested the change on a big Ada application (x86) and on GCC itself 
> (x86-64, both individual files and bootstrap), compilation times are not 
> affected.  The binaries are all slightly smaller.  Memory consumption is 
> harder to evaluate but doesn't seem to vary much either for the cases I've 
> looked at.

great, thanks,

Zdenek