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[Bug rtl-optimization/69052] [6 Regression] Performance regression after r229402.
- From: "ienkovich at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 27 Jan 2016 12:07:22 +0000
- Subject: [Bug rtl-optimization/69052] [6 Regression] Performance regression after r229402.
- Auto-submitted: auto-generated
- References: <bug-69052-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69052
--- Comment #8 from Ilya Enkovich <ienkovich at gcc dot gnu.org> ---
(In reply to amker from comment #7)
> According to discussion at https://gcc.gnu.org/ml/gcc/2016-01/msg00190.html,
> hook is probably not wanted in this case.
> Bernd gave another proposal by moving combine before loop transforms is also
> interesting, but it can be for GCC6.
> So a backend fix would be nice.
Unfortunately my patch causes significant regressions in some SPEC benchmarks.
Looks like address operands order matters in some other places.