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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>
This commit is contained in:
Ard Biesheuvel 2019-09-03 09:43:31 -07:00 committed by Herbert Xu
parent 6017826b49
commit 0cfd507c83
1 changed files with 2 additions and 3 deletions
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5
arch/arm64/crypto/aes-modes.S
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@ -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 */