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d771b3fb3e
-mattr=+alu32 has shown good performance vs. without this attribute. Based on discussion at https://lore.kernel.org/bpf/1ec37838-966f-ec0b-5223-ca9b6eb0860d@fb.com/T/#t cpu version v3 should support -mattr=+alu32. This patch enabled alu32 if cpu version is v3, either specified by user or probed by the llvm. Differential Revision: https://reviews.llvm.org/D69957
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