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  1. JDK
  2. JDK-8278868

Add x86 vectorization support for Long.bitCount()

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    • b05

    Description

      Vectorization support of Integer.bitCount() already exists but currently the same support is lacking for Long.bitCount(). Similar to the C2 PopCountVI node, we create a C2 PopCountVL node and use vpopcntq x86 instruction to enable vectorized Long.bitCount()

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          Bug - A problem which impairs or prevents the functions of the product. JDK-8279900 compiler/vectorization/TestPopCountVectorLong.java fails due to vpopcntdq is not supported

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8300487 Store cardinality as a field in BitSet

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed
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          Commit Commit openjdk/jdk/c4518e25

          Review Review openjdk/jdk/6857

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              sviswanathan Sandhya Viswanathan
              sgibbons Scott Gibbons
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                Updated:
                Resolved: