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[Bug middle-end/34400] [4.3 regression] bad interaction between DF and SJLJ exceptions
- From: "ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 10 Dec 2007 19:14:43 -0000
- Subject: [Bug middle-end/34400] [4.3 regression] bad interaction between DF and SJLJ exceptions
- References: <bug-34400-286@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #15 from ebotcazou at gcc dot gnu dot org 2007-12-10 19:14 -------
> 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.
Yes, this is a known problem of the Ada SJLJ scheme, it's too "unstructured".
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34400