Hi, On 2021-08-25 13:47, Michael Cree wrote: > On Tue, Aug 24, 2021 at 10:59:32PM +0200, Aurelien Jarno wrote: > > I would therefore like to discuss the future of the libc6.1-alphaev67 > > package on alpha. According to popcon, to take with a grain of salt > > given the low number of submissions, this package is installed on 20% of > > the installations. I wonder if this package is really useful in terms of > > performance, or if the architecture baseline can be raised to ev67, or > > to a ev6 as a compromise. The goal is to stop building this package. > > I think we should raise the baseline to include the byte-word > extension (BWX) which I think would be EV56. In addition to > giving some optimisations generally to libc it would eliminate > a class of unaligned access bugs across the archive where gcc > performs an optimisation based on a flawed determination that > certain alignment exists in the memory access of a byte or > 16-bit word.
That's really interesting. If raising the baseline to EV56 also helps to eliminate other bugs, it's something worth considering. Do you know if there is a lot of hardware not compatible with this baseline? Also do you have an idea if there is a big difference between EV56 and EV67 optimized code? Regards, Aurelien -- Aurelien Jarno GPG: 4096R/1DDD8C9B [email protected] http://www.aurel32.net
