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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/62263] Good codegen for bitwise rotate requires code that is technically undefined behavior
Date: Tue, 26 Aug 2014 12:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62263

--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
Also, I would have expected the pattern *<rotate_insn><mode>3_mask to avoid
generating 'andl' before 'roll'.