RFR: 8254998: C2: assert(!n->as_Loop()->is_transformed_long_loop()) failure with -XX:StressLongCountedLoop=1 [v2]

[Tobias Hartmann]

On Tue, 20 Oct 2020 07:11:30 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> Transformation of a long counted loop into a loop nest with a counted
>> loop inner loop happens in 2 passes of loop opts: first the loop nest
>> is created and then the inner loop is transformed into a counted
>> loop. The assert fires because the second step doesn't have a chance
>> to run given the first step was executed as the last loop opts pass
>> before running out of allowed loop opts passes. The fix I propose for
>> this corner case is to relax the assert to account for this.
>
> Roland Westrelin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   test fix

Marked as reviewed by thartmann (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/735