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PyPy Configuration[objspace.std.withsmallint]

objspace.std.withsmallint

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Basic Option Information

  • name: withsmallint
  • description: use tagged integers
  • command-line: --objspace-std-withsmallint
  • command-line for negation: --no-objspace-std-withsmallint
  • option type: boolean option
  • default: False
  • requirements:

Description

Use "tagged pointers" to represent small enough integer values: Integers that fit into 31 bits (respective 63 bits on 64 bit machines) are not represented by boxing them in an instance of W_IntObject. Instead they are represented as a pointer having the lowest bit set and the rest of the bits used to store the value of the integer. This gives a small speedup for integer operations as well as better memory behaviour.