[Bug tree-optimization/84419] [8 Regression] SPEC CPU2017/CPU2006 521/621, 527/627, 554/654, 445, 454, 481, 416 runfails after r256628 with march=skylake-avx512

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84419

--- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Created attachment 43456
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43456&action=edit
Possible patch

I think the problem was that the optimisation was dropping
the alignment information, so we ended up using an aligned
rather than an unaligned access.

I don't have access to skylake hardware, but could you
try the attached patch?