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crypto: arm/aes - streamline AES-192 code path

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This trims off a couple of instructions of the total size of the
core AES transform by reordering the final branch in the AES-192
code path with the rounds that are performed regardless of whether
the branch is taken or not. Other than the slight size reduction,
this has no performance benefit.

Fix up a comment regarding the prototype of this function while
we're at it.

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 2015-05-08 10:46:22 +02:00 committed by Herbert Xu
parent c80ae7ca37
commit 6499e8cfaa
1 changed files with 3 additions and 4 deletions
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7
arch/arm/crypto/aes-ce-core.S
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@ -101,15 +101,14 @@
\dround q10, q11
blo 0f @ AES-128: 10 rounds
vld1.8 {q10-q11}, [ip]!
beq 1f @ AES-192: 12 rounds
\dround q12, q13
beq 1f @ AES-192: 12 rounds
vld1.8 {q12-q13}, [ip]
\dround q10, q11
0: \fround q12, q13, q14
bx lr
1: \dround q12, q13
\fround q10, q11, q14
1: \fround q10, q11, q14
bx lr
.endm
@ -122,8 +121,8 @@
* q2 : third in/output block (_3x version only)
* q8 : first round key
* q9 : secound round key
* ip : address of 3rd round key
* q14 : final round key
* r2 : address of round key array
* r3 : number of rounds
*/
.align 6