[Bug tree-optimization/56902] Fails to SLP with mismatched +/- and negatable constants

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56902

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 31209
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31209&action=edit
hack

Btw, I also had a patch^Whack, see attached.  Also further patches that didn't
get merged to take care of vectorizing PR37021 better.