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  1. JDK
  2. JDK-8259609

C2: optimize long range checks in long counted loops

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    • b21

    Description

      JDK-8255150 makes it possible for java code to explicitly perform a range check on long values. JDK-8223051 provides a transformation of long counted loops into loop nests with an inner int counted loop. With this change I propose transforming long range checks that operate on the iv of a long counted loop into range checks that operate on the iv of the int inner loop once it has been created. Existing range check eliminations can then kick in.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8280600 C2: assert(!had_error) failed: bad dominance

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8223051 support loops with long (64b) trip counts

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

          Enhancement - null JDK-8276116 C2: optimize long range checks in int counted loops

          • 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-8278790 Inner loop of long loop nest runs for too few iterations

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8278296 Generalize long range check transformation

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

          Commit Commit openjdk/jdk/82f4aacb

          Review Review openjdk/jdk/2045

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              roland Roland Westrelin
              roland Roland Westrelin
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