[Bug tree-optimization/60577] [4.7/4.8/4.9 Regression] inefficient FDO instrumentation code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60577

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 32393
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32393&action=edit
hack

Like this (hack alert).  Applies store motion one level for a restricted set
of loops.  Requires us to add preheaders and record exits (and disambiguate
multiple latches) and compute dominators.