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  1. JDK
  2. JDK-8210858

AArch64: remove Math.log intrinsic

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    • b08
    • aarch64

      Remove Math.log instrinsic (it is already disabled).

      Reason: the available implementation gave incorrect results:

      public class LogTest {
          public static void main(String[] args) {
              double x = 4.9E-324;
              System.out.println(Math.log(x));
              System.out.println(StrictMath.log(x));
          }
      }

      Should be -744.4400719213812, result is -710.989276736877.
      Correct on Intel x86.

      Second reason: We do not have proof of the monotonicity for the patch of this intrinsic.

            tholenstein Tobias Holenstein
            aph Andrew Haley
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              Created:
              Updated:
              Resolved: