[Bug tree-optimization/30911] VRP fails to eliminate range checks in Ada code

[ebotcazou at gcc dot gnu dot org]

------- Comment #62 from ebotcazou at gcc dot gnu dot org  2008-03-30 15:45 -------
> Yes, even with -gnato.  With -gnato it checks that the
> addition doesn't overflow.

Oh, sorry, I thought we were talking about the overflow check...

> But there are no checks on the array access.  It looks like the f-e
> doesn't generate them in the first place (as opposed to fold or gigi
> making a mistake).

This is as documented in the GNAT manual, section 3.2.4 Validity Checking.
You need to pass -gnatVs to have them.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30911