[Bug tree-optimization/57584] [4.9 Regression] ice: SSA corruption: Unable to coalesce ssa_names

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57584

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
niter analysis computes

 (((unsigned long) sp_35(ab) - (unsigned long) (sp_3(ab) + 8)) + 7) / 8))

which the vectorizer inserts, obviously breaking coalescing of sp_35 and sp_3.
It's expand_simple_operations done in niter analysis that breaks this and
I have a patch to fix that.