[Bug rtl-optimization/60757] combine uses exponential time in nonzero_bits1 recursion

[amylaar at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60757

--- Comment #1 from Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> ---
Created attachment 32541
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32541&action=edit
epiphany cost fix that triggers combine exponential behaviour