[Bug tree-optimization/18241] [4.0 Regression] linux kernel loop gets miscompiled

[law at redhat dot com]

------- Additional Comments From law at redhat dot com  2004-12-13 22:15 -------
FWIW, I've walked through all the actions of DOM1 and AFAICT every change it
makes is correct.  I would have to strongly suspect that DOM1 is not the problem
here, but is instead changing things in such a way as to expose some downstream
issue.

I've also looked pretty closely at the later tree optimizer dumps.  If indeed
the problem is the ret = *pathp[0].slot statement blowing up, I would strongly
suggest some printf debugging of the first loop.  Namely, how many times does
it iterate and what is the value of pathp before and after the loop.

Jeff

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18241