diff options
| author |   Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2019-09-03 09:43:31 -0700 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2019-09-09 17:35:38 +1000 |
| commit | 0cfd507c83469b07f037100a6389b02ce99b546f (patch) | |
| tree | fd98a1794c9b19520521fbbf1d4e867ac0d497f2 /arch/arm64/crypto | |
| parent | crypto: skcipher - add the ability to abort a skcipher walk (diff) | |
| download | wireguard-linux-0cfd507c83469b07f037100a6389b02ce99b546f.tar.xz wireguard-linux-0cfd507c83469b07f037100a6389b02ce99b546f.zip | |
crypto: arm64/aes-cts-cbc-ce - performance tweak
Optimize away one of the tbl instructions in the decryption path,
which turns out to be unnecessary.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/arm64/crypto')
| -rw-r--r-- | arch/arm64/crypto/aes-modes.S | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/arm64/crypto/aes-modes.S b/arch/arm64/crypto/aes-modes.S index 2879f030a749..38cd5a2091a8 100644 --- a/arch/arm64/crypto/aes-modes.S +++ b/arch/arm64/crypto/aes-modes.S @@ -293,12 +293,11 @@ AES_ENTRY(aes_cbc_cts_decrypt) ld1 {v5.16b}, [x5] /* get iv */ dec_prepare w3, x2, x6 - tbl v2.16b, {v1.16b}, v4.16b decrypt_block v0, w3, x2, x6, w7 - eor v2.16b, v2.16b, v0.16b + tbl v2.16b, {v0.16b}, v3.16b + eor v2.16b, v2.16b, v1.16b tbx v0.16b, {v1.16b}, v4.16b - tbl v2.16b, {v2.16b}, v3.16b decrypt_block v0, w3, x2, x6, w7 eor v0.16b, v0.16b, v5.16b /* xor with iv */ |