On Tue, Jun 9, 2015 at 1:12 PM, Eric Botcazou <ebotca...@adacore.com> wrote: >> Yes, but I'd expect them to be optimized away (well, hopefully). > > OK, but you cannot reasonably expose everything in GENERIC/GIMPLE, for example > the mask-and-shift operations to extract bitfields in reverse SSO, only the > RTL expander has the (quite complex) logic and I doubt you want to teach the > GIMPLE optimizers about this low-level mess.
Why would you want to support this on bitfields ... (/me runs away). >> Anwyay, and I thought use of the feature would be rare so that "every load >> and store" is still very few? > > Experience has shown that, when users start to use it, they use it extensively > (too extensively if you ask me) so the implementation cannot be too dumb. :/ > -- > Eric Botcazou
