Optimize away one of the tbl instructions in the decryption path,
which turns out to be unnecessary.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
arch/arm64/crypto/aes-modes.S | 5 ++---
1 file 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 */
--
2.17.1
