[Bug tree-optimization/69848] poor vectorization of a loop from SPEC2006 464.h264ref

[wilson at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69848

--- Comment #13 from Jim Wilson <wilson at gcc dot gnu.org> ---
I think it was poc_ref_pic_reorder() in slice.c that triggered the ICE.  I
don't know if the original code shows the vectorization reduction problem. 
That might only be present in the reduced testcase.