https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #15 from Tamar Christina <tnfchris at gcc dot gnu.org> --- (In reply to JuzheZhong from comment #14) > > > > sure, but you can't use BIT_FIELD_REF on VLA vectors. > > > > > > So, for length partial vector. We can use VEC_EXTRACT with index = 0 since > > > VEC_EXTRACT optab allows VLA vectors now for length target. > > > > Sounds good :) > > I wonder whether ARM SVE can also use this approach VEC_EXTRACT with index = > 0. > > I guess the only issue is that when mask = all zero. That is, there is no > active elements, What behavior should be here for early break ? That shouldn't happen, in that case you wouldn't have entered the loop. To prevent this there's always a compare of n > 0 at the start of the loops to skip the vector body entirely.
