[Bug tree-optimization/98254] Failure to optimize simple pattern for __builtin_convertvector

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98254

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
   Last reconfirmed|                            |2021-01-04
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
extending simplify_vector_constructor to support loads would indeed be nice,
the first check should be to key on the same VUSE for all loads and only then
do more expensive checking, possibly using dataref analysis and sorting
according to what the vectorizer dataref group analysis does.