RVM

64bit object model wastes space with array length and status word

Details

  • Type: Improvement Improvement
  • Status: Open Open
  • Priority: Major Major
  • Resolution: Unresolved
  • Affects Version/s: None
  • Fix Version/s: 1000
  • Component/s: Runtime: Object Model
  • Labels:
    None
  • Number of attachments :
    0

Description

The object model for 64bit addresses uses 3 words to layout an array: one for array length, one for the TIB pointer and one for the status word. However, the status word only uses 32bits and the array length only needs 32bits. By overlapping the array length and status word we can save 64bits (8bytes) per object.

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People

  • Assignee:
    Unassigned
    Reporter:
    Ian Rogers
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Dates

  • Created:
    Updated: