Sparc V9 FXTOD instruction is very slow

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    • Type: Bug
    • Resolution: Fixed
    • Priority: P2
    • 1.4.0
    • Affects Version/s: 1.4.0
    • Component/s: hotspot
    • None
    • beta2
    • generic, x86
    • generic

      We use the new V9 FXTOD instruction to convert Longs to Doubles. This is performance-broken by a factor of 1000 for sufficiently large longs, which leads to a factor of 1000 slowdown between server vs client for random->double heavy codes.

      Run the attached file on both a U2 and a U3 to check out the speed problem.

      Re-enable for U2's when bug 4453420 is fixed.

            Assignee:
            Clifford Click (Inactive)
            Reporter:
            Clifford Click (Inactive)
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