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  1. JDK
  2. JDK-8203197

C2: consider all paths in loop body for loop predication

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    • Enhancement
    • Status: Resolved
    • P3
    • Resolution: Fixed
    • 11
    • 11
    • hotspot
    • b19

    Backports

      Description

        Loop predication is only applied to predicates in the loop body that are always executed. Predicates are sometimes in a path in the loop body that's frequently but not always executed. In this case, applying loop predication would be beneficial.

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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-8205888 C2: consider all paths in loop body for loop predication

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8235584 UseProfiledLoopPredicate fails with assert(_phase->get_loop(c) == loop) failed: have to be in the same loop

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8205407 [windows, vs<2017] C4800 after 8203197

            • 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-8231246 C2 computes wrong trip count for loops

            • P3 - Major loss of function.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-8205574 Loop predication "assert(f <= 1 && f >= 0) failed Incorrect frequency"

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8240220 IdealLoopTree::dump_head predicate printing is broken

            • 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-8205515 assert(opcode == Op_RangeCheck) failed: no other if variant here

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

            Enhancement - null JDK-8240223 Use consistent predicate order in and with PhaseIdealLoop::find_predicate

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

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                roland Roland Westrelin
                roland Roland Westrelin
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                  Created:
                  Updated:
                  Resolved: