crypto: x86/aes-xts - eliminate a few more instructions

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- For conditionally subtracting 16 from LEN when decrypting a message
  whose length isn't a multiple of 16, use the cmovnz instruction.

- Fold the addition of 4*VL to LEN into the sub of VL or 16 from LEN.

- Remove an unnecessary test instruction.

This results in slightly shorter code, both source and binary.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Eric Biggers 2024-04-12 20:17:27 -07:00 • committed by Herbert Xu

parent 2717e01fc3

commit e619723a85

1 changed files with 13 additions and 26 deletions

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arch/x86/crypto/aes-xts-avx-x86_64.S

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