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  1. JDK
  2. JDK-8278790

Inner loop of long loop nest runs for too few iterations

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      Description

        This came up with a panama micro-benchmark in which a loop has 256 iterations and a long range check with a small scale factor. A loop nest is created to transform the long range checks. The inner loop should still run for ~256 iterations but instead it only executes 256/scale iterations which has a performance impact.

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            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-8279097 Inner loop of long loop nest runs for too few iterations

            • P3 - Major loss of function.
            • 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-8279731 Inner loop of long loop nest runs for too few iterations

            • P3 - Major loss of function.
            • Resolved
            relates to

            Enhancement - null JDK-8259609 C2: optimize long range checks in long counted loops

            • P3 - Major loss of function.
            • Resolved

            Enhancement - null JDK-8256655 rework long counted loop handling

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

            Commit Commit openjdk/jdk18/bb7efb35

            Review Review openjdk/jdk18/35

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                roland Roland Westrelin
                roland Roland Westrelin
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