On 02 May 2023 13:40, Paul Koning wrote: > > On May 1, 2023, at 7:37 PM, Roger Sayle <ro...@nextmovesoftware.com> > wrote: > > > > ... > > The shiftsi.cc regression on xstormy16 is fixed by adding > > -fno-split-wide-types. > > In fact, if all the regression tests pass, I'd suggest that > > flag_split_wide-types = false should be the default on xstormy16 now > > that we've moved to LRA. And if this works for xstormy16, it might be > > useful to other targets for the LRA transition; it's a difference in > > behaviour between reload and LRA that could potentially affect > > multiple targets. > > Is there documentation for that flag?
Yes, see the section -fsplit-wide-types in https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html Interestingly, there's a recent-ish blog describing how -fno-split-wide-types reduces executable size on AVR: https://ufj.ddns.net/blog/marlin/2019/01/07/reducing-marlin-binary-size.html and its interaction with (AVR) register allocation is seen in PR middle-end/35860. Cheers, Roger --
