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  • #8923

Closed
Open
Created Mar 23, 2014 by tibbe@trac-tibbe

Add SmallArray# type

Add a SmallArray# (and SmallMutableArray#) type that doesn't have a card table. This would

  • save some memory (two words per array),
  • make updates cheaper (no writing to the card table), and
  • make GC faster (no traversing the card table).

The use case is the unordered-containers package, which uses small arrays to implement a hash array mapped trie.

A starting point would be [changeset:0417404f/ghc], which added the card table to the current array type.

Trac metadata
Trac field Value
Version 7.9
Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
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