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SRFI 135 proposed implementation improvement #824

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johnwcowan opened this issue Sep 8, 2018 · 0 comments
Open

SRFI 135 proposed implementation improvement #824

johnwcowan opened this issue Sep 8, 2018 · 0 comments
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@WillClinger
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C: Libraries C: R7RS C: REPRESENTATIONS C: Unicode enhancement P: minor T: performance
Milestone
Larceny 1.5

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@johnwcowan
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Store an extra flag in the record representing a SRFI 135 text indicating that all its characters are fixed-width. Because texts are immutable, the value of this flag can be determined at construction time. If it is set, a fast dereference operation can be used to find a particular character.

This flag would have no significance when used with kernel0, but would speed up (by a constant factor) access to ASCII-repertoire strings in kernel8 and UCS2-repertoire strings in kernel16, both of which are common cases.
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@WillClinger WillClinger

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C: Libraries C: R7RS C: REPRESENTATIONS C: Unicode enhancement P: minor T: performance
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Larceny 1.5
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@johnwcowan @WillClinger