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  1. JDK
  2. JDK-8188044

We need Math.unsignedMultiplyHigh

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    • Enhancement
    • Status: Resolved
    • P4
    • Resolution: Fixed
    • None
    • 18
    • core-libs
    • None
    • b05

    Description

      multiplyHigh has been added to java.langMath and its intrinsic implemented, but an unsigned version is more useful for crypto algorithms. While one can fairly easily be calculated from the other, it is slightly slower to make the adjustment and it makes sense to have methods and intrinsics for both.

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          CSR - null JDK-8269705 We need Math.unsignedMultiplyHigh

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

          Enhancement - null JDK-5100935 No way to access the 64-bit integer multiplication of 64-bit CPUs efficiently

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8275167 x86 intrinsic for unsignedMultiplyHigh

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

          Enhancement - null JDK-8273058 [macos]UnsignedMultiplyHigh is not implemented as an intrinsic

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

          Commit Commit openjdk/jdk/ca4bea46

          Review Review openjdk/jdk/4644

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              bpb Brian Burkhalter
              aph Andrew Haley
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                Created:
                Updated:
                Resolved: