immediate strings

[Dmitry Antipov]

Small strings (up to 3 bytes on 32-bit, up to 7 bytes on 64-bin) can be 
represented
as 'immediates' of struct Lisp_String, without allocating data separately. I 
observed
two usage scenarios (editing with a few tens of buffers and long 
byte-force-recompile
runs), and in both cases ~10% of live strings are less than 4 bytes long, and 
~30% of
live strings are less than 8 bytes long. So I think it's worth playing with 
such a
little complication.

Dmitry

immstr.patch
Description: Text document