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  1. JDK
  2. JDK-8283187

C2: loop candidate for superword not always unrolled fully if superword fails

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    • b16

    Backports

      Description

        IdealLoopTree::policy_unroll_slp_analysis() restricts unrolling of loops that are found to be candidate for superword but if superword then fails, unrolling doesn't always resume.

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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-8283968 C2: loop candidate for superword not always unrolled fully if superword fails

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

            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-8284267 C2: loop candidate for superword not always unrolled fully if superword fails

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

            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-8284340 C2: loop candidate for superword not always unrolled fully if superword fails

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

            Enhancement - null JDK-8286940 [IR Framework] Allow IR tests to build and use Whitebox without -DSkipWhiteBoxInstall=true

            • 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-8285695 Performance regression in C2 loop unrolling

            • P3 - Major loss of function.
            • Closed
            links to

            Commit Commit openjdk/jdk17u-dev/b5e83882

            Commit Commit openjdk/jdk18u/7ca0b988

            Commit Commit openjdk/jdk/14c20bc0

            Review Review openjdk/jdk17u-dev/333

            Review Review openjdk/jdk18u/84

            Review Review openjdk/jdk/7822

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                roland Roland Westrelin
                roland Roland Westrelin
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                  Updated:
                  Resolved: