[tor-bugs] #9663 [Tor]: Table-based basepoint multiply optimizations for ntor handshake

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#9663: Table-based basepoint multiply optimizations for ntor handshake
-------------------------+-------------------------------------------------
     Reporter:  nickm    |      Owner:
         Type:           |     Status:  needs_revision
  enhancement            |  Milestone:  Tor: 0.2.7.x-final
     Priority:  normal   |    Version:
    Component:  Tor      |   Keywords:  tor-relay, performance, ntor,
   Resolution:           |  026-triaged-0, 027-triaged-1-in
Actual Points:           |  Parent ID:  #9662
       Points:           |
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Comment (by yawning):

 Replying to [comment:17 nickm]:
 > eg (untested)
 >
 > {{{
 > #if defined(__SSE2__) && !(defined(__x86_64__) || defined(__amd64__))
 > ....
 > #endif
 > }}}
 > ?

 This should work (might need `x86intrin.h`?).  I'd like to see a
 comparison between ref10, 32 bit donna, and SSE2 donna before we go down
 this path, and for the purposes of the feature branch as is, I will ignore
 the issue for now since doing the integration work in a safe manner is
 more important.

 Will we ever consider removing the ref10 code/fallback stuff?  I don't
 think it particularly makes a difference to how I'm going to do this, but
 I think the portable versions of the donna code is well tested at this
 point.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9663#comment:18>
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