crypto: arm64/aes-blk - add 4 way interleave to CBC encrypt path

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CBC encryption is strictly sequential, and so the current AES code
simply processes the input one block at a time. However, we are
about to add yield support, which adds a bit of overhead, and which
we prefer to align with other modes in terms of granularity (i.e.,
it is better to have all routines yield every 64 bytes and not have
an exception for CBC encrypt which yields every 16 bytes)

So unroll the loop by 4. We still cannot perform the AES algorithm in
parallel, but we can at least merge the loads and stores.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Ard Biesheuvel 2018-03-10 15:21:52 +00:00 • committed by Herbert Xu

parent 55868b45cf

commit a8f8a69e82

1 changed files with 25 additions and 6 deletions

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arch/arm64/crypto/aes-modes.S

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