On 05/09/18 13:05, Richard Biener wrote:
On Wed, Sep 5, 2018 at 1:51 PM <a...@codesourcery.com> wrote:
GCN uses V64BImode to represent vector masks in the middle-end, and DImode
bit-masks to represent them in the back-end. These must be converted at expand
time and the most convenient way is to simply use a SUBREG.
x86 with AVX512 uses SImode in the middle-end as well via the get_mask_mode
vectorization target hook. Maybe you can avoid another special-case
by piggy-backing on
that?
That's exactly what I wanted to do, but I found that returning
non-vector modes ran into trouble further down the road. I don't recall
the exact details now, but there were assertion failures and failures to
vectorize.
That was in a GCC 8 codebase though, so is the AVX thing a recent change?
Andrew
