[Bug rtl-optimization/25514] [4.0/4.1 regression] internal consistency failure

[ebotcazou at gcc dot gnu dot org]

------- Comment #16 from ebotcazou at gcc dot gnu dot org  2007-01-05 18:10 -------
> Eric asked me to weigh in here.  My only concern about a backport is Comment
> #9, which suggests that the patch didn't work.  I'm assuming that since we're
> all talking about backporting it, that comment was mistaken?  If indeed there
> are no known problems, I think it's reasonable to put this on 4.1.

Thanks Mark.  It seems that a whole new class of internal consistency failures
due to the mishandling of REG_NOTEs in the combiner appeared in 4.1.x (for
example rtl-optimization/28243 and the blocked rtl-optimization/29329) and up.
Richard's patch is the most generic fix available as of today, so backporting
it or not to the 4.1.x branch has cascading effects on the other PRs.  Maybe
the problem reported in comment #9 is another variant.

Richard, are you still ready to backport it?  If so, I can revert my patch for
rtl-optimization/28243 right now to make things easier.


-- 

ebotcazou at gcc dot gnu dot org changed:

           What    |Removed                     |Added
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                 CC|                            |mark at codesourcery dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25514