[Bug middle-end/34400] [4.3 regression] bad interaction between DF and SJLJ exceptions

[steven at gcc dot gnu dot org]

------- Comment #13 from steven at gcc dot gnu dot org  2007-12-10 18:40 -------
The problem seems to be that we just converge too slowly because the CFG is
densely connected: 566 basic blocks and 19925 edges.

Actually this is perfectly quadratic: Two basic blocks are fake (exit and
entry) so there are 564 real basic blocks.  (564 / 4)^2 = 141^2 = 19881. 
Indeed the number of edges scales with the number of MCASEs in the test case.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34400