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[Bug tree-optimization/45978] [4.6 Regression] bogus "array subscript is above array bounds" warning in extremely simple code with no loops
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 15 Nov 2010 12:00:24 +0000
- Subject: [Bug tree-optimization/45978] [4.6 Regression] bogus "array subscript is above array bounds" warning in extremely simple code with no loops
- Auto-submitted: auto-generated
- References: <bug-45978-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45978
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-15 12:00:20 UTC ---
Hmm, I'm not sure how to address this - we warn about the address-taking
operation which only at VRP time get's folded to &MEM[(struct Y
*)&<retval>].ar[4]
via maybe_fold_stmt_addition (which I only preserved to avoid some regressions
I don't remember anymore during mem-ref development).
Clearly even the first vectorized access spans more than the array (but we
could set TREE_NO_WARNING on the memory reference itself).