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  1. JDK
  2. JDK-4406429

RFE: Add IEEE 754 Recommended Functions to Math, StrictMath

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    Details

    • Type: Enhancement
    • Status: Closed
    • Priority: P4
    • Resolution: Duplicate
    • Affects Version/s: 1.3.0, 5.0
    • Fix Version/s: None
    • Component/s: core-libs
    • Labels:
    • Subcomponent:
    • CPU:
      generic
    • OS:
      generic

      Description

      Name: yyT116575 Date: 01/19/2001


      ~/project/visMineBench>java -version
      java version "1.3.0"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
      Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

      Java should incorporate the following methods into java.lang.Math:

            copySign(x,y) returns x with the sign of y.
            scalb(y,n) returns y * 2n for integers n without
                           explicitly computing 2n.
            nextAfter(x,y) returns the next representable neighbor of x in the
                           direction towards y.
            unordered(x,y) Returns true is one of its arguments is unordered
                           with respect to the other.
                           This occurs when at least one is a NaN.
            fpClass(x) Returns an integer that indicates which of the
                           nine "kinds" of IEEE floating-point numbers x is.
            logb(x) Returns the unbiased exponent of x.

      These descriptions are copied from:
      http://math.nist.gov/javanumerics/reports/jgfnwg-01.html

      It also says there that IEEE 754 recommends these methods.
      (Review ID: 115478)
      ======================================================================

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              Assignee:
              darcy Joe Darcy
              Reporter:
              yyoungsunw Yung-ching Young (Inactive)
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