https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118145
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2024-12-20
Summary|Regression of code |[14/15 Regression] SLP cost
|generation due to an overly |model for ior/add reduction
|eager vectorization attempt |should be improved
Keywords| |missed-optimization
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
/app/example.c:10:12: note: Cost model analysis for part in loop 0:
Vector cost: 24
Scalar cost: 28
If you replace | with +, it still gets vectorized.
And using aarch64 with addition, the cost model for aarch64 is better and
rejects the vectorization:
/app/example.cpp:6:12: note: Cost model analysis for part in loop 0:
Vector cost: 6
Scalar cost: 3
I suspect this is a dup of another cost model issue too.
