On Sat, Sep 11, 2010 at 1:59 PM, Peter Stuge <[email protected]> wrote: > Marc Jones wrote: >> doesn't really explain why gcc doesn't do a rep stos or rep mov >> (which should hit the cache)/ That should be an easy optimization >> for gcc. > > Except I don't think it's an optimization performance-wise. But if > you enable -Os then I would expect it to use rep stosb. >
It is an optimzation over a byte copy, which is what the code does. We don't have optimized mem functions. >> It also doesn't address why coreboot has a functions when we could >> use gcc intrinsic that should be optimized for the architecture >> they are built for. > > Good point! I guess we rolled our own to be less dependent on gcc. I > think it would be OK to use gcc's implementations though. Good point, but most compilers have intrinsics for these functions, Do we need a compiler intrinsics layer? Marc -- http://se-eng.com -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
