Optimize FindMatchLengthWithLimit with RISC-V RVV vector instructions#1410
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Dayuxiaoshui wants to merge 1 commit into
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Optimize FindMatchLengthWithLimit with RISC-V RVV vector instructions#1410Dayuxiaoshui wants to merge 1 commit into
Dayuxiaoshui wants to merge 1 commit into
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Add RISC-V RVV optimized implementation of FindMatchLengthWithLimit function using vector instructions for 16-byte parallel comparison. Performance improvements: - Compression: +2.16% average improvement - Decompression: +2.66% average improvement - Best case: +7.56% compression improvement on 1MB data Implementation details: - Uses vle8.v to load 16 bytes at once - Uses vmseq.vv for parallel vector comparison - Uses vfirst.m to quickly find first mismatch position - Falls back to 8-byte blocks and byte-by-byte for remaining data The optimization is enabled when BROTLI_TARGET_RISCV_RVV is defined and runs on 64-bit little-endian targets. The original TZCNT64-based implementation remains available as a fallback. Tested with GCC 12.3.1, -O3 -march=rv64gcv, 100 iterations. Co-authored-by: gong-flying <gongxiaofei24@iscas.ac.cn>
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Add RISC-V RVV optimized implementation of FindMatchLengthWithLimit function using vector instructions for 16-byte parallel comparison.
Performance improvements:
Implementation details:
The optimization is enabled when BROTLI_TARGET_RISCV_RVV is defined and runs on 64-bit little-endian targets. The original TZCNT64-based implementation remains available as a fallback.
Tested with GCC 12.3.1, -O3 -march=rv64gcv, 100 iterations.