On Thu, Jun 20, 2019 at 4:58 PM H.J. Lu <hjl.to...@gmail.com> wrote: > > > > > >> > > +/* Register pair. */ > > > > > >> > > +VECTOR_MODES_WITH_PREFIX (P, INT, 2); /* P2QI */ > > > > > >> > > +VECTOR_MODES_WITH_PREFIX (P, INT, 4); /* P2HI P4QI */ > > > > > >> > > > > > > > >> > > I think > > > > > >> > > > > > > > >> > > INT_MODE (P2QI, 16); > > > > > >> > > INT_MODE (P2HI, 32); > > > > > >> > > > > > > > >> > > with the above subreg approach should work. > > Yes, it works. > > > > But i didn't figure out how did pass_reload correctly handle such subreg, > > do you have suggestions such as "which function i can dig into first" or > > "which piece of codes handle subreg"? > > You need to define REGMODE_NATURAL_SIZE.
It looks to me that this define needs to be updated for vector modes. We can't access all parts of xmm regs in word_mode. Uros.
