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[Bug tree-optimization/79291] r244897 introduces IV related performance issues for daxpy on MIPS by enabling peeling for alignment
- From: "doug.gilmore at imgtec dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 02 Feb 2017 06:47:36 +0000
- Subject: [Bug tree-optimization/79291] r244897 introduces IV related performance issues for daxpy on MIPS by enabling peeling for alignment
- Auto-submitted: auto-generated
- References: <bug-79291-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79291
--- Comment #4 from Doug Gilmore <doug.gilmore at imgtec dot com> ---
> It also looks like mips lacks implementation of any of the
> vectorizer cost hooks and thus defaults to
> default_builtin_vectorization_cost which means that unaligned
> loads/stores have double cost.
I have investigated that in the past and that costing is needed
in some cases. I'll start looking into that again.