[Bug tree-optimization/56490] [4.6/4.7 Regression] -Wall triggering infinite loop

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56490



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



           What    |Removed                     |Added

----------------------------------------------------------------------------

           Priority|P3                          |P2

          Component|middle-end                  |tree-optimization

      Known to work|                            |4.8.0

             Blocks|                            |47344

            Summary|[4.6/4.7/4.8 Regression]    |[4.6/4.7 Regression] -Wall

                   |-Wall triggering infinite   |triggering infinite loop

                   |loop                        |



--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> 2013-03-08 
15:51:44 UTC ---

"Fixed" on trunk by



2013-03-01  Xinliang David Li  <davi...@google.com>



        * tree-ssa-uninit.c (compute_control_dep_chain): Limit post-dom

        walk length.



after the patch:



 uninit var analysis     :   1.05 (84%) usr



so it's still very expensive.