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[Bug tree-optimization/78725] [7 Regression] wrong code at -O3 on x86_64-linux-gnu (in both 32-bit and 64-bit modes)
- From: "matz at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 12 Dec 2016 15:32:52 +0000
- Subject: [Bug tree-optimization/78725] [7 Regression] wrong code at -O3 on x86_64-linux-gnu (in both 32-bit and 64-bit modes)
- Auto-submitted: auto-generated
- References: <bug-78725-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78725
--- Comment #5 from Michael Matz <matz at gcc dot gnu.org> ---
(In reply to Michael Matz from comment #4)
> Thanks for the second testcase as well. It's not quite the same
> miscompilation
> (the induction vars don't overflow), but a related one (the value of d
> considered in the conditional statement is the final one after the d-loop
> finishes, not the value at the use itself). Fixed with v2 of the patch,
> at https://gcc.gnu.org/ml/gcc-patches/2016-12/msg01035.html .
(Btw: nice testcases, I assume they are generated somehow by a code generator
that knows a bit about semantics?)