2010/1/18 Eelco Dolstra <[email protected]>: > BTW, it's not entirely clear whether Graphite is currently all that useful to > enable in the default GCC build. I couldn't really find any benchmarks about > this. AFAIK the GCC flags that turn on the Graphite optimisations are not > included in -O2/-O3, so there are probably no packages in Nixpkgs that would > currently benefit anyway. I've checked the gcc manual, and I also understand that no Graphite-related optimization is performed under -O2 or -O3, so the only way a package can get some benefit from them is with explicit statement of the optimization flags. I've been looking for a benchmark showing any improvement involving the ppl thing in gcc, and I have not found it. As far as I understand, the few optimizations that can be enabled will interest mostly people wanting to avoid cache hits in some rare simple but long loops, and I think that the kind of people having any need of that, they would have written the loops better themselves before expecting gcc to support such optimizations.
So I would accept easily having cloog+ppl disabled in the main stdenv gcc. Regards, Lluís. _______________________________________________ nix-dev mailing list [email protected] https://mail.cs.uu.nl/mailman/listinfo/nix-dev
