Commit 373e2a97 authored by Niels Möller's avatar Niels Möller
Browse files

(_aes_crypt): Decrement round when looping, saving yet some


Rev: src/nettle/sparc/aes.asm:1.61
parent bef4b962
......@@ -27,7 +27,7 @@ define(diff, %l2)
define(nrounds, %l3)
! Loop variables
define(round, %l4) ! Really 16 * round
define(round, %l4)
define(i, %l5)
! Further loop invariants
......@@ -57,24 +57,22 @@ _aes_crypt:
! Compute xor, so that we can swap efficiently.
xor wtxt, tmp, diff
! The loop variable will be multiplied by 16.
sll nrounds, 4, nrounds
! More loop invariants
add T, AES_TABLE0, T0
add T, AES_TABLE1, T1
add T, AES_TABLE2, T2
add T, AES_TABLE3, T3
! Read src, and add initial subkey
! Difference between ctx and src
! Difference between ctx and src.
! NOTE: This isntruction is duplicated in the delay slot
sub ctx, src, %g2
! Difference between wtxt and src
sub wtxt, src, %g3
! For stop condition. Note that src is incremented in the
! delay slot
add src, 8, %g4
ldub [src+3], t3
......@@ -98,7 +96,7 @@ _aes_crypt:
bleu .Lsource_loop
add src, 4, src
mov 16, round
sub nrounds, 1, round
add ctx, 16, key
......@@ -158,11 +156,10 @@ _aes_crypt:
! switch roles for tmp and wtxt
xor wtxt, diff, wtxt
add round, 16, round
subcc round, 1, round
add key, 16, key
cmp round, nrounds
blu .Lround_loop
bne .Lround_loop
xor tmp, diff, tmp
! final round
......@@ -218,8 +215,8 @@ _aes_crypt:
addcc length, -16, length
bne .Lblock_loop
! add dst, 16, dst
sub ctx, src, %g2
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