Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8287009

Useless CastPPs added by PhiNode::Ideal optimization

    XMLWordPrintable

Details

    • Enhancement
    • Resolution: Unresolved
    • P4
    • tbd
    • 19, 20
    • hotspot

    Description

      As described in the PR of JDK-8280696 (https://github.com/openjdk/jdk/pull/8770), the following code might add a useless CastPP with a strong dependency that blocks other optimizations:
      https://github.com/openjdk/jdk/blob/aa7ccdf44549a52cce9e99f6569097d3343d9ee4/src/hotspot/share/opto/cfgnode.cpp#L2013-L2016

      The code was originally introduced by 8139771.

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8280696 C2 compilation hits assert(is_dominator(c, n_ctrl)) failed

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8139771 Eliminating CastPP nodes at Phis when they all come from a unique input may cause crash

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

          Activity

            People

              Unassigned Unassigned
              thartmann Tobias Hartmann
              Votes:
              0 Vote for this issue
              Watchers:
              1 Start watching this issue

              Dates

                Created:
                Updated: