https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91934
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2019-09-30
CC| |matz at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Component|c |tree-optimization
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I guess you are talking about the new unroll-and-jam transform transforming
your loop and that making the vectorized variant slower somehow. You can try
if -fno-loop-unroll-and-jam fixes the slowness.
But I'm not sure what "strange SIMD instructions" you are refering to.
I'm also not sure what exactly unroll-and-jam keyed onto.
