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cd64dd70d5
It requires fast unaligned access to 64-bit integers and a fast instruction to count leading zeros in a 64-bit integer (__builtin_ctzll()). This perhaps should be enabled on some other archs too. Thanks to Chenxi Mao for the original patch: https://github.com/tukaani-project/xz/pull/75 (the first commit) According to the numbers there, this may improve encoding speed by about 3-5 %. This enables the 8-byte method on MSVC ARM64 too which should work but wasn't tested.