Daphne Preston-Kendal c09897c449 Add a feature to cache the most recent string index->cursor result ... This is lighter-weight than building a full index->cursor table for the string, adding a constant two words to the memory required to store a string, as opposed to one word for every n characters. The cached cursor is used for any string-ref operation requesting an index after the most-recently-requested index, making potentially quadratic repeated string-ref procedures run in linear time. In theory, it could also use a heuristic to speed up moving backwards through the string when it thinks that moving the old cursor backwards would be faster than starting again at the start of the string. In practice, my logging of when the cached cursor is actually reused during the Chibi compilation and startup process shows that the most common case of moving backwards is going back to the start of the string anyway. Benchmarks to follow.		2021-12-10 21:24:05 +01:00
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chibi	Add a feature to cache the most recent string index->cursor result	2021-12-10 21:24:05 +01:00