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<p id="commit-message" style="margin:0px;font-family:cousine, monospace;font-size:14px;line-height:22px;font-family: cousine, monospace; font-size: 14px; text-align: left; line-height: 22px;">Optimize AES-ECB mode in OpenSSL for both aarch64 and aarch32<br><br>Aes-ecb mode can be optimized by inverleaving cipher operation on<br>several blocks and loop unrolling. Interleaving needs one ideal<br>unrolling factor, here we adopt the same factor with aes-cbc,<br>which is described as below:<br> If blocks number > 5, select 5 blocks as one iteration,every<br> loop, decrease the blocks number by 5.<br> If 3 < left blocks < 5 select 3 blocks as one iteration, every<br> loop, decrease the block number by 3.<br> If left blocks < 3, treat them as tail blocks.<br>Detailed implementation will have a little adjustment for squeezing<br>code space.<br>With this way, for small size such as 16 bytes, the performance is<br>similar as before, but for big size such as 16k bytes, the performance<br>improves a lot, even reaches to 100%, for some arches such as A57,<br>the improvement even exceeds 100%. The following table will list the<br>encryption performance data on aarch64, take a72 and a57 as examples.<br>Performance value takes the unit of cycles per byte, takes the format<br>as comparision of values. List them as below:<br><br>A72:<br> Before optimization After optimization Improve<br>evp-aes-128-ecb@16 17.26538237 16.82663866 2.61%<br>evp-aes-128-ecb@64 5.50528499 5.222637557 5.41%<br>evp-aes-128-ecb@256 2.632700213 1.908442892 37.95%<br>evp-aes-128-ecb@1024 1.876102047 1.078018868 74.03%<br>evp-aes-128-ecb@8192 1.6550392 0.853982929 93.80%<br>evp-aes-128-ecb@16384 1.636871283 0.847623957 93.11%<br>evp-aes-192-ecb@16 17.73104961 17.09692468 3.71%<br>evp-aes-192-ecb@64 5.78984398 5.418545192 6.85%<br>evp-aes-192-ecb@256 2.872005308 2.081815274 37.96%<br>evp-aes-192-ecb@1024 2.083226672 1.25095642 66.53%<br>evp-aes-192-ecb@8192 1.831992057 0.995916251 83.95%<br>evp-aes-192-ecb@16384 1.821590009 0.993820525 83.29%<br>evp-aes-256-ecb@16 18.0606306 17.96963317 0.51%<br>evp-aes-256-ecb@64 6.19651997 5.762465812 7.53%<br>evp-aes-256-ecb@256 3.176991394 2.24642538 41.42%<br>evp-aes-256-ecb@1024 2.385991919 1.396018192 70.91%<br>evp-aes-256-ecb@8192 2.147862636 1.142222597 88.04%<br>evp-aes-256-ecb@16384 2.131361787 1.135944617 87.63%<br><br>A57:<br> Before optimization After optimization Improve<br>evp-aes-128-ecb@16 18.61045121 18.36456218 1.34%<br>evp-aes-128-ecb@64 6.438628994 5.467959461 17.75%<br>evp-aes-128-ecb@256 2.957452881 1.97238604 49.94%<br>evp-aes-128-ecb@1024 2.117096219 1.099665054 92.52%<br>evp-aes-128-ecb@8192 1.868385973 0.837440804 123.11%<br>evp-aes-128-ecb@16384 1.853078526 0.822420027 125.32%<br>evp-aes-192-ecb@16 19.07021756 18.50018552 3.08%<br>evp-aes-192-ecb@64 6.672351486 5.696088921 17.14%<br>evp-aes-192-ecb@256 3.260427769 2.131449916 52.97%<br>evp-aes-192-ecb@1024 2.410522832 1.250529718 92.76%<br>evp-aes-192-ecb@8192 2.17921605 0.973225504 123.92%<br>evp-aes-192-ecb@16384 2.162250997 0.95919871 125.42%<br>evp-aes-256-ecb@16 19.3008384 19.12743654 0.91%<br>evp-aes-256-ecb@64 6.992950658 5.92149541 18.09%<br>evp-aes-256-ecb@256 3.576361743 2.287619504 56.34%<br>evp-aes-256-ecb@1024 2.726671027 1.381267599 97.40%<br>evp-aes-256-ecb@8192 2.493583657 1.110959913 124.45%<br>evp-aes-256-ecb@16384 2.473916816 1.099967073 124.91%<br><br>Change-Id: Iccd23d972e0d52d22dc093f4c208f69c9d5a0ca7<br><br>Reviewed-by: Shane Lontis <shane.lontis@oracle.com><br>Reviewed-by: Richard Levitte <levitte@openssl.org><br>(Merged from https://github.com/openssl/openssl/pull/10518)</p>
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