[Bug tree-optimization/81673] Harmful SLP vectorization

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81673

Martin Jambor <jamborm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |80689

--- Comment #5 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Benchmarking the patch revealed that without addressing PR 80689
first, it severely harms -Ofast performance of 538.imagick_r.  With PR
80689 addressed, it helps as intended.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80689
[Bug 80689] 128 bit loads generated for structure copying with gcc 7.1.0 and
leads to STLF stalls in avx2 targets.