Commit 7a70cc7a authored by Niels Möller's avatar Niels Möller
Browse files

(_aes_crypt): Some peep hole optimizations, duplicating some

instructions to fill nop:s, and put branch instructions on even
word addresses.

Rev: src/nettle/sparc/aes.asm:1.66
parent a06b715e
......@@ -69,12 +69,12 @@ _aes_crypt:
add T, AES_SIDX3, IDX3
! Read src, and add initial subkey
! Difference between ctx and src.
! NOTE: This instruction is duplicated in the delay slot
! NOTE: These instruction is duplicated in the delay slot,
! and the instruction before the branch
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
......@@ -105,6 +105,7 @@ _aes_crypt:
add ctx, 16, key
! 4*i
! NOTE: Instruction duplicated in delay slot
mov 0, i
! The comments mark which j in T->table[j][ Bj(wtxt[IDXi(i)]) ]
......@@ -151,21 +152,23 @@ _aes_crypt:
add i, 4, i
! switch roles for tmp and wtxt
xor wtxt, diff, wtxt
xor tmp, diff, tmp
subcc round, 1, round
add key, 16, key
bne .Lround_loop
xor tmp, diff, tmp
bne .Linner_loop
mov 0, i
! final round
! 4*i
mov 0, i
! Use round as the loop variable, as it's already zero
define(i, round)
! Comments mark which j in T->sbox[Bj(wtxt[IDXj(i)])]
! the instruction is part of
! NOTE: First instruction duplicated in delay slot
ld [IDX1+i], t1 ! 1
! IDX2(j) = j XOR 2
xor i, 8, t2
! ld [idx-16], t2 ! 2
......@@ -205,15 +208,15 @@ _aes_crypt:
stb t3, [dst+3]
stb t2, [dst+2]
stb t0, [dst]
add dst, 4, dst
bleu .Lfinal_loop
add dst, 4, dst
ld [IDX1+i], t1 ! 1
addcc length, -16, length
sub ctx, src, %g2
bne .Lblock_loop
sub ctx, src, %g2
sub wtxt, src, %g3
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