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    crypto: chacha20 - Add an eight block AVX2 variant for x86_64 · 3d1e93cd
    Martin Willi authored
    
    
    Extends the x86_64 ChaCha20 implementation by a function processing eight
    ChaCha20 blocks in parallel using AVX2.
    
    For large messages, throughput increases by ~55-70% compared to four block
    SSSE3:
    
    testing speed of chacha20 (chacha20-simd) encryption
    test 0 (256 bit key, 16 byte blocks): 42249230 operations in 10 seconds (675987680 bytes)
    test 1 (256 bit key, 64 byte blocks): 46441641 operations in 10 seconds (2972265024 bytes)
    test 2 (256 bit key, 256 byte blocks): 33028112 operations in 10 seconds (8455196672 bytes)
    test 3 (256 bit key, 1024 byte blocks): 11568759 operations in 10 seconds (11846409216 bytes)
    test 4 (256 bit key, 8192 byte blocks): 1448761 operations in 10 seconds (11868250112 bytes)
    
    testing speed of chacha20 (chacha20-simd) encryption
    test 0 (256 bit key, 16 byte blocks): 41999675 operations in 10 seconds (671994800 bytes)
    test 1 (256 bit key, 64 byte blocks): 45805908 operations in 10 seconds (2931578112 bytes)
    test 2 (256 bit key, 256 byte blocks): 32814947 operations in 10 seconds (8400626432 bytes)
    test 3 (256 bit key, 1024 byte blocks): 19777167 operations in 10 seconds (20251819008 bytes)
    test 4 (256 bit key, 8192 byte blocks): 2279321 operations in 10 seconds (18672197632 bytes)
    
    Benchmark results from a Core i5-4670T.
    
    Signed-off-by: default avatarMartin Willi <martin@strongswan.org>
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    3d1e93cd