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  1. JDK
  2. JDK-8358013

[PPC64] VSX has poor performance on Power8

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P3 P3
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    • ppc

      The C2 code using VSX instructions has poor performance on Power8. The following tests run into timeouts:
      compiler/runtime/Test7196199.java
      compiler/runtime/safepoints/TestRegisterRestoring.java
      compiler/vectorization/TestFloat16VectorOperations.java
      compiler/vectorization/TestVectorZeroCount.java
      compiler/vectorization/TestVectorsNotSavedAtSafepoint.java

      The performance is much better on Power9. We could switch off SuperwordUseVSX for Power8.

            mdoerr Martin Doerr
            mdoerr Martin Doerr
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              Created:
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