On Sun, Jun 24, 2007 at 09:34:05PM -0400, Jeff Garzik wrote: > Adrian Bunk wrote: >> The interesting questions are: >> Does -Os still sometimes generate faster code with gcc 4.2? >> If yes, why? > > Smaller code can mean fewer page faults, fewer cache invalidations, etc. > > It's not just a matter of compiler code generation, gotta look at the whole > picture.
Sure, but my point is that if the kernel is considered special and the best optimization for the kernel is therefore between -Os and -O2, we should try to find this point of best optimization. This should address Arjans point that -Os might not be best choice for best performance (and it's actually our fault if gcc generates stupid but small code when we use -Os). > Jeff cu Adrian -- "Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/