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

ak at muc dot de gcc-bugzilla@gcc.gnu.org
Mon Nov 1 03:07:00 GMT 2004


------- Additional Comments From ak at muc dot de  2004-11-01 03:07 -------
I must correct myself slightly - the kernel oops I see is not the second
loop, but in the check before:

     ret = *pathp[0].slot;   <--- references either NULL or a bogus pointer
        if (ret == NULL) 
                goto out;


I tried various options, but only -O0 resolves it. -O1, -O2 -fno-ivopts or -O1
-fno-tree-loop-ivcanon doesn't (depending on the options the crash
is a NULL pointer or a bogus non NULL pointer)  


It's hard unfortunately to construct a run time test because it would
need to create a simulated radixtree.

-- 


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



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