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https://issues.apache.org/jira/browse/HADOOP-19663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18016359#comment-18016359
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ASF GitHub Bot commented on HADOOP-19663:
-----------------------------------------
PeterPtroc opened a new pull request, #7903:
URL: https://github.com/apache/hadoop/pull/7903
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### Description of PR
Add a RISC-V-specific compilation unit:
org/apache/hadoop/util/bulk_crc32_riscv.c.
- Contains a no-op constructor reserved for future HW capability detection
and dispatch.
- Keeps runtime behavior unchanged (falls back to the generic software path
in bulk_crc32.c).
- Wire CMake to select bulk_crc32_riscv.c on riscv32/riscv64, mirroring
other platforms.
This PR establishes the foundational build infrastructure for future RISC-V
Zbc (CLMUL) CRC32/CRC32C acceleration without changing current behavior.
Follow-ups (HADOOP-19655) will introduce HW-accelerated implementations and
runtime dispatch.
### How was this patch tested?
- Ensured native build for hadoop-common compiles cleanly with RISC-V
selection.
- Verified by test_bulk_crc32.
- No new tests added, as this patch is scaffolding-only without any behavior
change.
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [x] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [x] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
> Add RISC-V build infrastructure and placeholder implementation for CRC32
> acceleration
> -------------------------------------------------------------------------------------
>
> Key: HADOOP-19663
> URL: https://issues.apache.org/jira/browse/HADOOP-19663
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: common
> Affects Versions: 3.5.0
> Reporter: Ptroc
> Priority: Major
> Fix For: 3.5.0
>
>
> Establish the foundational build infrastructure for RISC-V CRC32 hardware
> acceleration support while maintaining full backward compatibility with
> existing software implementations.
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