[Bug tree-optimization/122793] [15/16 regression] ffmpeg miscompiled with -O2 -march=x86-64-v2 since r15-4114-g8157f3f2d211bf

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122793

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot 
gnu.org

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'm testing the patch, it looks reasonable.  I'll note the initial support
was for very limited cases of lowpart or concat but as written the checks
would cover more cases, so it's somewhat a bad design.