[Bug 1552939] Re: arm64 build doesn't use asm and is 4x-16x slower than it could be

[Yangzheng Bai]

Verified the new xenial-proposed openssl and libssl debs, both AES and
SHA performance have been significantly improved.

We tested the following packages from xenial-proposed on arm64 (aarch64
with fp asimd evtstrm aes pmull sha1 sha2 crc32) and the performance
result is as expected:

libssl1.0.0_1.0.2g-1ubuntu2_arm64.deb
libssl1.0.0-dbg_1.0.2g-1ubuntu2_arm64.deb
libssl1.0.0-dbgsym_1.0.2g-1ubuntu2_arm64.ddeb
libssl-dev_1.0.2g-1ubuntu2_arm64.deb
libssl-dev-dbgsym_1.0.2g-1ubuntu2_arm64.ddeb
libssl-doc_1.0.2g-1ubuntu2_all.deb
openssl_1.0.2g-1ubuntu2_arm64.deb
openssl-dbgsym_1.0.2g-1ubuntu2_arm64.ddeb

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https://bugs.launchpad.net/bugs/1552939

Title:
  arm64 build doesn't use asm and is 4x-16x slower than it could be

Status in OpenSSL:
  Invalid
Status in openssl package in Ubuntu:
  Fix Committed
Status in openssl package in Debian:
  New

Bug description:
  The openssl build for arm64 doesn't compile in the assembly that is
  present in openssl as of version 1.0.2 for aarch64 because the debian-
  targets.patch that is applied specifies a target that doesn't have
  assembly. The line at issue is debian-arm64 target which needs
  ${no_asm}  changed to ${aarch64_asm}:linux64. Running openssl speed
  -evp aes-128-gcm shows a 4x-16x improvement in performance with this
  change made and the package rebuilt. Other aes and sha variants show
  similar performance gains by enabling asm.

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