[Bug tree-optimization/66263] [4.8/4.9/5/6 Regression] Performance regression from gcc-4.8 and up (trivial sudoku program)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66263

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Target|                            |x86_64-*-*
          Component|c                           |tree-optimization
   Target Milestone|---                         |4.8.5
            Summary|Performance regression from |[4.8/4.9/5/6 Regression]
                   |gcc-4.8 and up (trivial     |Performance regression from
                   |sudoku program)             |gcc-4.8 and up (trivial
                   |                            |sudoku program)

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'd say it might be changes in inlining.  For single-file testcases it's
profitable to add -fwhole-program to -Ofast as well.