git: openjdk/jdk-sandbox: shen-late-barriers: 2 new changesets

[duke]

Changeset: a8d649f9
Branch: shen-late-barriers
Author:    Aleksey Shipilev <aleksey at shipilev.net>
Date:      2026-02-11 12:02:35 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/a8d649f9c4889e8884868ad3db3450e2ca4d4931

x86: harmonize load/store match costs

! src/hotspot/cpu/x86/gc/shenandoah/shenandoah_x86_64.ad
+ test/micro/org/openjdk/bench/vm/gc/barriers/reads/NullChecks.java

Changeset: a8e5c853
Branch: shen-late-barriers
Author:    Aleksey Shipilev <aleksey at shipilev.net>
Date:      2026-02-11 18:23:34 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/a8e5c85354fe5612b5d715b4e93933a790303102

Handle load specializations through barrier elision

! src/hotspot/cpu/x86/gc/shenandoah/shenandoah_x86_64.ad
! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.hpp