On Mon, May 17, 2010 at 8:44 AM, Maxim Kuvyrkov <ma...@codesourcery.com> wrote: > CodeSourcery is working on improving performance for Intel's Core 2 and Core > i7 families of processors. > > CodeSourcery plans to add support for unaligned vector instructions, to > provide fine-tuned scheduling support and to update instruction selection > and instruction cost models for Core i7 and Core 2 families of processors. > > As usual, CodeSourcery will be contributing its work to GCC. Currently, our > target is the end of GCC 4.6 Stage1. > > If your favorite benchmark significantly under-performs on Core 2 or Core i7 > CPUs, don't hesitate asking us to take a look at it.
I'd like to ask you to look at ffmpeg (missed core2 vectorization opportunities), polyhedron (PR34501, like, duh! :-), and Apache benchmark (-mtune=core2 results in lower scores). You could check overall effects on an openly available benchmark suite such as http://www.phoronix-test-suite.com/ Good luck with this project, it'll be great when -mtune=core2 actually improves performance rather than degrading it! Ciao! Steven
