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https://issues.apache.org/jira/browse/HADOOP-19666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18030699#comment-18030699
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ASF GitHub Bot commented on HADOOP-19666:
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steveloughran commented on PR #7912:
URL: https://github.com/apache/hadoop/pull/7912#issuecomment-3416334594
It's been a long time since I did C code, I'll have to stare at this a while.
In #7903 that creation of the file bulk_crc32_riscv.c should be what the new
code goes into; work with @PeterPtroc to get something you are both happy with
*and tested*.
Having two people who are set up to build and test this on riscv hardware is
exactly what we need to get this done
> Add hardware-accelerated CRC32 support for riscv64 using the v,zbc,zvbc
> extension
> ---------------------------------------------------------------------------------
>
> Key: HADOOP-19666
> URL: https://issues.apache.org/jira/browse/HADOOP-19666
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: native
> Affects Versions: 3.4.1
> Reporter: Lei Wen
> Priority: Major
> Labels: pull-request-available
>
> This PR implements vector-accelerated CRC32 using the RISC-V V, Zbc and Zvbc
> instruction sets, with full functional verification and performance testing
> completed.
> The implementation uses the vclmul.v and vclmulh.v (carry-less multiply)
> instructions for data folding and computes the final checksum via Barrett
> reduction.
> Key Features:
> 1. Runtime Hardware Detection
> The PR uses kernel hardware probing and cpuinfo parsing to dynamically detect
> hardware support for CRC32 acceleration (via v, zbc, and zvbc extensions) at
> runtime.
> 2. Performance Improvement
> Hardware-accelerated CRC32 achieves a performance boost of over *3x* compared
> to the software implementation.
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