https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94865
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
Last reconfirmed| |2020-04-30
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Similar as PR94864. I'll note that x86 might fare better if on GIMPLE instead
of
_1 = BIT_FIELD_REF <b_3(D), 64, 64>;
result_4 = BIT_INSERT_EXPR <a_2(D), _1, 64>;
return result_4;
we had a VEC_PERM but IIRC for two-element vectors this regressed some cases.
Note for this case the IL looks like above from the start so pattern-matching
a insert of an element from another vector to a permute might be a possibility
as well.
