Integrated: 8253524: C2: Refactor code that clones predicates during loop unswitching

[Roland Westrelin]

On Wed, 23 Sep 2020 08:30:45 GMT, Roland Westrelin <roland at openjdk.org> wrote:

> During unswitching, PhaseIdealLoop::create_slow_version_of_loop()
> calls PhaseIdealLoop::clone_predicates_to_unswitched_loop() twice, one
> for each loops, to clone some predicates above each loop. That code is
> fragile as it (implicitly) requires the fast loop to be processed
> first. I propose calling
> PhaseIdealLoop::clone_predicates_to_unswitched_loop() a single time
> and have it handle both loops in a single pass.

This pull request has now been integrated.

Changeset: b1e2f026
Author:    Roland Westrelin <roland at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/b1e2f026
Stats:     113 lines in 3 files changed: 20 ins; 49 del; 44 mod

8253524: C2: Refactor code that clones predicates during loop unswitching

Reviewed-by: chagedorn, kvn, thartmann

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PR: https://git.openjdk.java.net/jdk/pull/317