leiwen2025 opened a new pull request, #7912:
URL: https://github.com/apache/hadoop/pull/7912
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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