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[Bug tree-optimization/30911] VRP fails to eliminate range checks in Ada code
- From: "ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 Mar 2008 15:45:21 -0000
- Subject: [Bug tree-optimization/30911] VRP fails to eliminate range checks in Ada code
- References: <bug-30911-13647@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla 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.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30911