RFR: 8308076: X86_64: make rheapbase register allocatable in zero based compressedOops mode [v4]
kuaiwei
duke at openjdk.org
Tue May 16 05:57:12 UTC 2023
> In x86 64 mode, decode heap oop could use SIB without base if heap base is zero. like
>
> 0d1 movl R11, [,R9 << 3 + #72] (zero base compressed oop addressing) # compressed ptr ! Field: java/lang/ClassLoader.classAssertionStatus
>
> So rheapbase( r12 ) can be allocated as general register.
>
> Tier 1/2 tests are passed without new failure.
kuaiwei has updated the pull request incrementally with one additional commit since the last revision:
fix reinit_heabase and add cpu specific compressedOops.hpp
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/13976/files
- new: https://git.openjdk.org/jdk/pull/13976/files/2ea32cdf..b054907b
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=13976&range=03
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=13976&range=02-03
Stats: 226 lines in 9 files changed: 219 ins; 6 del; 1 mod
Patch: https://git.openjdk.org/jdk/pull/13976.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/13976/head:pull/13976
PR: https://git.openjdk.org/jdk/pull/13976
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