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  1. JDK
  2. JDK-8241484

Optimizing vector logic not operation

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    Details

    • Type: Enhancement
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: 15
    • Fix Version/s: tbd
    • Component/s: hotspot
    • Labels:

      Description

      - Current Implementation of vector logic not operation performs a Xor operation between the input vector and Broadcasted -1 value which is read from an externally initialized memory.
      - The broadcast operation can be made efficient by replacing a read from external memory (which may cause a cache miss) over non-AVX3 targets.
      - Over AVX3 a single ternary logic instruction is sufficient to replace complete pattern involving Xor and broadcast operation.

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              Assignee:
              jbhateja Jatin Bhateja
              Reporter:
              jbhateja Jatin Bhateja
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                Created:
                Updated: