[jira] [Commented] (HADOOP-19655) Add RISC-V Zbc (CLMUL) hardware-accelerated CRC32/CRC32C implementation

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-19655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18016175#comment-18016175 ] 

ASF GitHub Bot commented on HADOOP-19655:
-----------------------------------------

PeterPtroc opened a new pull request, #7896:
URL: https://github.com/apache/hadoop/pull/7896

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   ### Description of PR
   
   - Implements a CLMUL-based 16B fold + Barrett reduction algorithm, adapted from riscv-crc32-clmul.
   - True interleaved (round-robin) multi-block pipeline (1–3 blocks) to increase ILP.
   - Small buffers and tails fall back to the existing table-based software path.
   - Runtime gating:
     - Double-checked detection: “zbc” in /proc/cpuinfo AND a SIGILL-safe CLMUL probe.
   
   ### How was this patch tested?
   
   - Build (native profile):
     - mvn -pl hadoop-common-project/hadoop-common -am -Pnative -DskipTests clean install
   - Run benchmark:
     - mvn -Pnative -DskipTests -Dexec.classpathScope=test -Dexec.mainClass=org.apache.hadoop.util.Crc32PerformanceTest 
   
   ### 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)?
   - [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`, `NOTICE-binary` files?
   
   




> Add RISC-V Zbc (CLMUL) hardware-accelerated CRC32/CRC32C implementation
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-19655
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19655
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: hadoop-common, performance
>    Affects Versions: 3.5.0
>            Reporter: Ptroc
>            Priority: Major
>             Fix For: 3.5.0
>
>
> This patch introduces hardware-accelerated CRC32 and CRC32C algorithms for RISC-V platforms supporting the Zbc extension (CLMUL instructions) in bulk_crc32_riscv.c.
> Key changes:
>  * Implements optimized CRC32 and CRC32C routines using CLMUL instructions for zlib and Castagnoli polynomials.
>  * Automatically switches to hardware acceleration when Zbc is available, otherwise falls back to generic table-based software implementation.
>  * Maintains compatibility with platforms lacking Zbc support.
> This optimization improves CRC performance on RISC-V CPUs with Zbc extension.



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