[Bug tree-optimization/50328] reduction with constant or invariant not vectorized

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50328

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-09-08 
13:55:54 UTC ---
Created attachment 25228
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25228
preliminary patch

Patch that still ICEs its testcase.  Works for testcases that first require
loop interchange though.