[tor-bugs] #16535 [Tor]: Investigate building ed25519-donna with SSE2 support.

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#16535: Investigate building ed25519-donna with SSE2 support.
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     Reporter:  yawning      |      Owner:  yawning
         Type:  enhancement  |     Status:  needs_review
     Priority:  minor        |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor          |    Version:  Tor: 0.2.7
   Resolution:               |   Keywords:  tor-relay, performance, ntor
Actual Points:               |  Parent ID:
       Points:               |
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Changes (by yawning):

 * status:  accepted => needs_review


Comment:

 https://github.com/Yawning/tor/compare/feature16535

 Using `ed25519-donna-identify.h`'s CPU identification macros instead of
 the compilers since the header does all the work needed here, and it picks
 it up with the x86_64 check commented out on my box (and the tests pass
 with the SSE2 code, though it's slower).

 I think this is low-risk enough to take, and the gains are worth while,
 though I'm not sure how much of our relay/HS server userbase is 32 bit x86
 these days.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16535#comment:2>
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