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274c81389f
Currently at the start of the Extend() call we process some number of bytes to align the length to a multiple of 16. However, for large inputs we then process another small number of bytes to align the next load address to 8 bytes, undoing the length alignment. At the end of the call, we process the remaining bytes anyway. The initial length alignment is not useful, since it is undone anyway. We never return early here for small inputs since this function is only used for lengths > 64 anyway. Removing this reduces the amount of time we spend processing only a small number of bytes at a time. Also, we can optimize processing the remaining bytes at the end by leveraging the CRC32 instructions for 2,4, and 8 bytes. This looks to be about 2-5% faster on various platforms for typical input sizes. PiperOrigin-RevId: 793697720 Change-Id: Ibe71a51c851863ad40acef7d334694a9ac930f4d