[CM] TeXmacs & S7

[Elijah Stone]

Another idea is inline caching...

On Mon, 17 Jan 2022, Elijah Stone wrote:

> On Mon, 17 Jan 2022, bil at ccrma.Stanford.EDU wrote:
>
>> Currently, s7's optimizer sometimes depends on the position of the 
>> variables in environments, so your change is only safe if the optimizer 
>> gives up. Since the order matters, a hash-table lookup is unlikely to work 
>> without some serious overhead.  Most environments have only a handful of 
>> locals, and a small linear search is faster than a hash-table lookup (and 
>> the search is unnecessary if the variables have unique names).
>
> Why not maintain a hash table whose values are offsets into the flat 
> environment?  Then it's a cheap branch or two on lookup to see: 1) is there a 
> hash table; 2) should I build one (is the env big enough, and have there been 
> enough lookups).
>
> -E
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