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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: 15
Affects Version/s: None
Component/s: hotspot
Labels:
- zgc

Subcomponent:
gc
Resolved In Build:
b23

Today, the use of compressed class pointers assumes the use of compressed oops. This is an unnecessary restriction that for example causes each object to waste 32 bits with ZGC. The restriction should be removed.

relates to

JDK-8246689 [aarch64] Enable independent compressed oops/class ptrs on Aarch64

Resolved

JDK-8253910 UseCompressedClassPointers depends on UseCompressedOops in vmError.cpp

Resolved

JDK-8259368 Zero: UseCompressedClassPointers does not depend on UseCompressedOops

Resolved

JDK-8244943 Improve Class Space placement

Closed

JDK-8244971 Zero VM is broken after JDK-8241825 (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS not defined)

Resolved

JDK-8283249 CompressedClassPointers.java fails on ppc with 'Narrow klass shift: 0' missing

Resolved

JDK-8277172 Remove stray comment mentioning instr_size_for_decode_klass_not_null on x64

Resolved

JDK-8254252 Generic arraycopy stub overwrites callee-save rdi register on 64-bit Windows

Closed

JDK-8362591 Wrong argument warning when heap size larger than coops threshold

Resolved

JDK-8221249 x86: make r12_heapbase register available when compressed oops do not require it

Closed

(5 relates to)

Assignee:: Erik Österlund
Reporter:: Erik Österlund
Votes:: 0 Vote for this issue
Watchers:: 3 Start watching this issue

Created:: 2020-03-30 02:56
Updated:: 2025-07-21 02:23
Resolved:: 2020-05-13 04:01

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