http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56490
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work|4.8.0 |
Summary|[4.6/4.7 Regression] -Wall |[4.6/4.7/4.8 Regression]
|triggering infinite loop |-Wall triggering infinite
| |loop
Known to fail| |4.8.0
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> 2013-03-08
16:03:30 UTC ---
Clearly the limiting is bougs ... the issue is with large fanout BBs
we recurse in compute_control_dep_chain which leads to exponential
complexity. Limiting that to 8^5 isn't really a fix ... (yes, you
can call that O(1)).
compute_control_dep_chain is called 65 million times(!) for the testcase
after the patch.
There has to be a better algorithmic way of implementing this.
IMHO still not fixed in 4.8.
