Optimize AES-ECB mode in OpenSSL for both aarch64 and aarch32
Aes-ecb mode can be optimized by inverleaving cipher operation on
several blocks and loop unrolling. Interleaving needs one ideal
unrolling factor, here we adopt the same factor with aes-cbc,
which is described as below:
If blocks number > 5, select 5 blocks as one iteration,every
loop, decrease the blocks number by 5.
If 3 < left blocks < 5 select 3 blocks as one iteration, every
loop, decrease the block number by 3.
If left blocks < 3, treat them as tail blocks.
Detailed implementation will have a little adjustment for squeezing
code space.
With this way, for small size such as 16 bytes, the performance is
similar as before, but for big size such as 16k bytes, the performance
improves a lot, even reaches to 100%, for some arches such as A57,
the improvement even exceeds 100%. The following table will list the
encryption performance data on aarch64, take a72 and a57 as examples.
Performance value takes the unit of cycles per byte, takes the format
as comparision of values. List them as below:
A72:
Before optimization After optimization Improve
evp-aes-128-ecb@16 17.
26538237 16.
82663866 2.61%
evp-aes-128-ecb@64 5.
50528499 5.
222637557 5.41%
evp-aes-128-ecb@256 2.
632700213 1.
908442892 37.95%
evp-aes-128-ecb@1024 1.
876102047 1.
078018868 74.03%
evp-aes-128-ecb@8192 1.
6550392 0.
853982929 93.80%
evp-aes-128-ecb@16384 1.
636871283 0.
847623957 93.11%
evp-aes-192-ecb@16 17.
73104961 17.
09692468 3.71%
evp-aes-192-ecb@64 5.
78984398 5.
418545192 6.85%
evp-aes-192-ecb@256 2.
872005308 2.
081815274 37.96%
evp-aes-192-ecb@1024 2.
083226672 1.
25095642 66.53%
evp-aes-192-ecb@8192 1.
831992057 0.
995916251 83.95%
evp-aes-192-ecb@16384 1.
821590009 0.
993820525 83.29%
evp-aes-256-ecb@16 18.
0606306 17.
96963317 0.51%
evp-aes-256-ecb@64 6.
19651997 5.
762465812 7.53%
evp-aes-256-ecb@256 3.
176991394 2.
24642538 41.42%
evp-aes-256-ecb@1024 2.
385991919 1.
396018192 70.91%
evp-aes-256-ecb@8192 2.
147862636 1.
142222597 88.04%
evp-aes-256-ecb@16384 2.
131361787 1.
135944617 87.63%
A57:
Before optimization After optimization Improve
evp-aes-128-ecb@16 18.
61045121 18.
36456218 1.34%
evp-aes-128-ecb@64 6.
438628994 5.
467959461 17.75%
evp-aes-128-ecb@256 2.
957452881 1.
97238604 49.94%
evp-aes-128-ecb@1024 2.
117096219 1.
099665054 92.52%
evp-aes-128-ecb@8192 1.
868385973 0.
837440804 123.11%
evp-aes-128-ecb@16384 1.
853078526 0.
822420027 125.32%
evp-aes-192-ecb@16 19.
07021756 18.
50018552 3.08%
evp-aes-192-ecb@64 6.
672351486 5.
696088921 17.14%
evp-aes-192-ecb@256 3.
260427769 2.
131449916 52.97%
evp-aes-192-ecb@1024 2.
410522832 1.
250529718 92.76%
evp-aes-192-ecb@8192 2.
17921605 0.
973225504 123.92%
evp-aes-192-ecb@16384 2.
162250997 0.
95919871 125.42%
evp-aes-256-ecb@16 19.
3008384 19.
12743654 0.91%
evp-aes-256-ecb@64 6.
992950658 5.
92149541 18.09%
evp-aes-256-ecb@256 3.
576361743 2.
287619504 56.34%
evp-aes-256-ecb@1024 2.
726671027 1.
381267599 97.40%
evp-aes-256-ecb@8192 2.
493583657 1.
110959913 124.45%
evp-aes-256-ecb@16384 2.
473916816 1.
099967073 124.91%
Change-Id: Iccd23d972e0d52d22dc093f4c208f69c9d5a0ca7
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10518)
projects / openssl.git / commit