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Peter Anvin" , Linus Torvalds , Andy Shevchenko , Matthew Wilcox References: <20241210144945.2325330-1-arnd@kernel.org> <20241210144945.2325330-6-arnd@kernel.org> From: irecca.kun@gmail.com In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 12/11/24 01:56, Arnd Bergmann wrote: > -ftree-vectorize is only enabled by default at -O3 level You maybe missed it, but vectorization is enabled at -O2 level since GCC 12. https://www.phoronix.com/news/GCC-12-Auto-Vec-O2 Same goes for clang, it pretty much always had vectorized on -O2, iirc. > avx2 is already turned off because of -mno-avx, Hmm, I'm not sure. But if we look at existing KBUILD_RUSTFLAGS below, it has both -avx and -avx2.