git: openjdk/jdk: master: 8370049: [s390x] G1 barrier compareAndExchange does not return old value when compareExchange fails

[Andrew Dinn]

Changeset: 5609ee11
Branch: master
Author:    Vladimir Petko <vpetko at openjdk.org>
Committer: Andrew Dinn <adinn at openjdk.org>
Date:      2025-10-20 08:05:51 +0000
URL:       https://git.openjdk.org/jdk/commit/5609ee11a2daf888d02c0c1b2b70eb4df817582c

8370049: [s390x] G1 barrier compareAndExchange does not return old value when compareExchange fails

Reviewed-by: amitkumar, aph, rcastanedalo

! src/hotspot/cpu/s390/gc/g1/g1_s390.ad
! test/hotspot/jtreg/compiler/gcbarriers/TestG1BarrierGeneration.java