[Bug tree-optimization/51938] missed optimization: 2 comparisons

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51938

--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> 2012-06-08 19:49:07 UTC ---
Created attachment 27590
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27590
incomplete patch

I wonder if this is the right direction. At least it passes the testsuite and
optimizes the original testcase.