Integrated: 8252219: C2: Randomize IGVN worklist for stress testing

Mon Sep 28 06:48:25 UTC 2020

On Fri, 18 Sep 2020 10:28:28 GMT, Roberto Castaneda Lozano <github.com+8792647+robcasloz at openjdk.org> wrote:

> Add `StressIGVN` option to let C2 randomize IGVN worklist order. When enabled, the worklist is shuffled before each
> main run of the IGVN loop. Also add `GenerateStressSeed` and `StressSeed=N` options to randomly generate or specify the
> seed. In either case, the seed is logged if `LogCompilation` is enabled. The new options are declared as
> production+diagnostic for consistency with the existing `StressLCM` and `StressGCM` options.

This pull request has now been integrated.

Changeset: fed3636f
Author:    Roberto Castaneda Lozano <roberto.castaneda.lozano at oracle.com>
Committer: Tobias Hartmann <thartmann at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/fed3636f
Stats:     229 lines in 10 files changed: 224 ins; 0 del; 5 mod

8252219: C2: Randomize IGVN worklist for stress testing

Add 'StressIGVN' option to let C2 randomize IGVN worklist order. When enabled,
the worklist is shuffled before each main run of the IGVN loop. Also add
'StressSeed=N' option to specify the seed. If the seed is not specified, a
random one is generated. In either case, the seed is logged if 'LogCompilation'
is enabled. The new options are declared as production+diagnostic for
consistency with the existing 'StressLCM' and 'StressGCM' options.

Reviewed-by: kvn, chagedorn, thartmann

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PR: https://git.openjdk.java.net/jdk/pull/242