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  1. JDK
  2. JDK-8316688

Widen allowable error bound of Math.hypot

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Details

    • Bug
    • Resolution: Fixed
    • P4
    • 22
    • 22
    • core-libs
    • b17

    Description

      The Math.hypot method claims its error bound is one ulp.

      The paper

      "Accuracy of Mathematical Functions in Single, Double, Double
      Extended, and Quadruple Precision"
      Brian Gladman, Vincenzo Innocente and Paul Zimmermann
      September 21, 2023
      https://members.loria.fr/PZimmermann/papers/accuracy.pdf

      lists a known worst-case error of 1.21 ulps for hypot for the "OpenLibm" math library, which is a derivative of FDLIBM.

      The specification of Math.hypot should be updated to acknowledge the wider error bound.

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        Issue Links

          csr for

          CSR - null JDK-8316690 Widen allowable error bound of Math.hypot

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8326530 Widen allowable error bound of Math.tan

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8229259 Math.hypot result not always within 1 ulp of exact result

          • P3 - Major loss of function.
          • Closed
          links to

          Commit Commit openjdk/jdk/b66ded9a

          Review Review openjdk/jdk/15868

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              darcy Joe Darcy
              darcy Joe Darcy
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                Updated:
                Resolved: