[jdk17u-dev] RFR: 8316645: RISC-V: Remove dependency on libatomic by adding cmpxchg 1b
Gui Cao
gcao at openjdk.org
Sat Nov 18 10:20:55 UTC 2023
Hi, I would like to backport this riscv-specific change to remove dependency on latomic libraries.
latomic is used for non native atomic operation which causes problems with extra dependency. This have been fixed in recent gcc, so latomic is no longer needed. this backport will work for older gcc versions as well, it uses assembly code.
The backport is not clean because jdk17u-dev has no [JDK-8307806](https://bugs.openjdk.org/browse/JDK-8307806), and the original patch modified a test case(test/hotspot/gtest/runtime/test_atomic.cpp), but there is no corresponding test case in the jdk17u-dev.
### Testing:
qemu 8.1.50 with UseRVV:
- [x] Tier1 tests (release)
- [x] Tier2 tests (release)
- [x] Tier3 tests (release)
-------------
Commit messages:
- Backport 8316645: RISC-V: Remove dependency on libatomic by adding cmpxchg 1b
Changes: https://git.openjdk.org/jdk17u-dev/pull/1970/files
Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1970&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8316645
Stats: 79 lines in 2 files changed: 73 ins; 6 del; 0 mod
Patch: https://git.openjdk.org/jdk17u-dev/pull/1970.diff
Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1970/head:pull/1970
PR: https://git.openjdk.org/jdk17u-dev/pull/1970
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