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  1. JDK
  2. JDK-8251525

AArch64: Faster Math.signum(fp)

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    • Subcomponent:
    • Resolved In Build:
      b15
    • CPU:
      aarch64

      Backports

        Description

        C2 compiled code for Java implementation contains 2 branch instructions and expensive moves between GPRs and FPRs. From another hand there is a bunch of instructions that can be used to bypass that.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8265397 AArch64: Faster Math.signum(fp)

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8252779 compiler/graalunit/HotspotTest.java failed after JDK-8251525

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed

            Enhancement - null JDK-8265491 Math Signum optimization for x86

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

            Enhancement - null JDK-8249198 Faster Math.signum(fp) for positive and negative numbers

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

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                Assignee:
                dchuyko Dmitry Chuyko
                Reporter:
                dchuyko Dmitry Chuyko
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                  Updated:
                  Resolved: