https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68277
--- Comment #5 from Oleg Endo <olegendo at gcc dot gnu.org> --- (In reply to Kazumoto Kojima from comment #4) > (In reply to Oleg Endo from comment #3) > > I haven't read reload.*, but my speculation is that if something in reload > > instantiates that rtx with an imm8 constant to calculate addresses, it might > > also try to instantiate it with reg = reg + reg if the constant doesn't fit > > into imm8. Maybe we just don't hit the case (yet). So it's probably safer > > to allow reg = reg + reg, too. > > Sounds reasonable. Could you please add it to your nightly test run and commit it if there no other new failures? I'll be away for a few days... > > > I guess those "new" failures are R0 related? > > Yep, spill failure in R0. Our old friend. Hm ... so maybe for now we should enable -mlra by default and add a 2nd postreload CSE pass as you have tried in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67732#c2 ?
