Integrated: 8283187: C2: loop candidate for superword not always unrolled fully if superword fails

[Roland Westrelin]

On Tue, 15 Mar 2022 15:45:08 GMT, Roland Westrelin <roland at openjdk.org> wrote:

> IdealLoopTree::policy_unroll_slp_analysis() restricts unrolling of
> loops that are found to be candidate for superword but if superword
> then fails, unrolling doesn't always resume. SuperWord::output() has
> logic for that in one of the failure paths but some other paths are
> not covered (for instance in the case of the test case). I propose
> that superword explictly returns whether it succeeded or not and that
> in case of failure, for a main loop, unrolling be attempted again.

This pull request has now been integrated.

Changeset: 14c20bc0
Author:    Roland Westrelin <roland at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/14c20bc0e0ee32b82ffe653ae9e4a0be52d578cb
Stats:     135 lines in 5 files changed: 90 ins; 6 del; 39 mod

8283187: C2: loop candidate for superword not always unrolled fully if superword fails

Reviewed-by: thartmann, chagedorn

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PR: https://git.openjdk.java.net/jdk/pull/7822