https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109276
--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Uroš Bizjak from comment #15) > (In reply to Jakub Jelinek from comment #13) > > asks for a DImode stack slot, ix86_local_alignment newly doesn't lower the > > alignment > > which isn't good for -mpreferred-stack-boundary=2. > > IIRC, DImode FILD/FIST(P) instructions execute faster when memory is aligned > to 64 bits. *If* it is possible, 64 bit alignment is preferred. Well, user who uses -mpreferred-stack-boundary=2 probably doesn't care about performance that much. I guess I could also check whether we've already decided to dynamically reallocate the stack for some other reasons and only use 32-bit alignment if we haven't. But there are too many such flags, so not sure what to check.
