vertex numbers

[yakra]

Carving out this side topic in order to close #217. Some background/notes there.

A few different v7 & v8 flavors are on BiggaTomato in branches: v7gs 5849d90 v8 d8da55e Refamiliarize.

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Another possible v7 variant...

// simple, collapsed & traveled vertex numbers, per thread
int& HighwayGraph::s_vertex_num(HGVertex const* v, const int threadnum)
{   return vnums[(threadnum*vertices.size()+v-vertices.data())*3];
}
int& HighwayGraph::c_vertex_num(HGVertex const* v, const int threadnum)
{   return vnums[(threadnum*vertices.size()+v-vertices.data())*3+1];
}
int& HighwayGraph::t_vertex_num(HGVertex const* v, const int threadnum)
{   return vnums[(threadnum*vertices.size()+v-vertices.data())*3+2];
}

That's a hell of a lot of arithmetic to get our array indices.

• [ ] Convert vnums to a static thread_local HGVertex member. This gets rid of threadnum*vertices.size()+, size() itself being calculated via begin()-end().
• [ ] Save an index to the first pointer: unsigned int vnum = HGVertex::vnums+(v-vertices.data())*3;
• [ ] Get our refs via vnum[0], vnum[1] & vnum[2].

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Like I said in https://github.com/yakra/DataProcessing/issues/217#issuecomment-1092112851

Hold off until more optimizations are in place and any changes may be more easily observed.

TMBitset is implemented, but there's more that can be done:

• [ ] HGEdge alignment & size
• [x] Edge membership via TMBitset
• [ ] HGEdge::intermediate_points -> C array
• [ ] 16 byte HGEdge (depends on contiguous Waypoints)
• [x] Vertex membership via TMBitset
• [ ] HGVertex size & alignment
• [ ] concurrency lists to vectors
• [ ] ...and more?