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  1. JDK
  2. JDK-8287061

Support for rematerializing scalar replaced objects participating in allocation merges

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    • b07

    Description

      After allocation merges are "simplified" from the IR graph and the merged objects are scalar replaced we need a way to rematerialize the scalarized objects when/if the execution executes a trap.

      As suggested in this thread (https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2022-April/055256.html) we might be able to do this using a similar mechanism as used by SafePointScalarObjectNode.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8315003 [lworld] Implement full support for JDK-8287061

          • P3 - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. JDK-8312495 assert(0 <= i && i < _len) failed: illegal index after JDK-8287061 on big endian platforms

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8313689 C2: compiler/c2/irTests/scalarReplacement/AllocationMergesTests.java fails intermittently with -XX:-TieredCompilation

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8312617 SIGSEGV in ConnectionGraph::verify_ram_nodes

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8312456 Potential null pointer access in LoadNode::split_through_phi after JDK-8287061

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

          Enhancement - null JDK-8289943 Simplify some object allocation merges

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8322854 Incorrect rematerialization of scalar replaced objects in C2

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8323190 Segfault during deoptimization of C2-compiled code

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8318682 SA decoding of scalar replaced objects is broken

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8314923 [lworld] AllocationMergesTests.java fails IR verification

          • 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-8322572 AllocationMergesTests.java fails with "IRViolationException: There were one or multiple IR rule failures."

          • 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-8312631 C2 crash: assert(false) failed: Unexpected use of reducible Phi

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8319784 VM crash during heap dump after JDK-8287061

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8324688 C2: Disable ReduceAllocationMerges by default

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

          Enhancement - null JDK-8310980 Add a flag to let us signal that diagnostic information should be emitted whenever RAM optimization bails out

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

          Commit Commit openjdk/jdk/a53345ad

          Review Review openjdk/jdk/12897

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              cslucas Cesar Soares
              cslucas Cesar Soares
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                Updated:
                Resolved: