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crypto: arm/aes-neonbs - replace tweak mask literal with composition

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Replace the vector load from memory sequence with a simple instruction
sequence to compose the tweak vector directly.

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 09:43:27 -07:00 committed by Herbert Xu
parent e53b43d8d4
commit 38e73b3d38
1 changed files with 3 additions and 5 deletions
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8
arch/arm/crypto/aes-neonbs-core.S
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@ -887,10 +887,6 @@ ENDPROC(aesbs_ctr_encrypt)
veor \out, \out, \tmp
.endm
.align 4
.Lxts_mul_x:
.quad 1, 0x87
/*
* aesbs_xts_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[])
@ -899,7 +895,9 @@ ENDPROC(aesbs_ctr_encrypt)
*/
__xts_prepare8:
vld1.8 {q14}, [r7] // load iv
__ldr q15, .Lxts_mul_x // load tweak mask
vmov.i32 d30, #0x87 // compose tweak mask vector
vmovl.u32 q15, d30
vshr.u64 d30, d31, #7
vmov q12, q14
__adr ip, 0f