[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  <davidxl@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.