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

[mark at codesourcery dot com]

------- Comment #17 from mark at codesourcery dot com  2007-01-05 18:13 -------
Subject: Re:  [4.0/4.1 regression] internal consistency
 failure

ebotcazou at gcc dot gnu dot org wrote:

> 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.

Do you mean positive cascading effects, in that bugs go away, or
negative, in that new bugs show up?  Do you think that backporting this
patch is going to fix some bugs at the expense of breaking others?

Thanks,


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