snappy: optimize UnalignedCopy64 and IncrementalCopy for RISC-V#3360
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snappy: optimize UnalignedCopy64 and IncrementalCopy for RISC-V#3360Felix-Gong wants to merge 1 commit into
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Use RISC-V inline assembly (ld/sd) for 8-byte copy operations instead of generic macro-based implementation. Changes: - UnalignedCopy64: direct ld/sd pair for 8-byte copy - IncrementalCopy: 8-byte bulk copies when source/dest don't overlap Performance improvement (direct function benchmark): - Decompress compressible-256K: 728 MB/s -> 2205 MB/s (+203%) - Decompress zeros-256K: 543 MB/s -> 1462 MB/s (+169%) Tests: brpc_snappy_compress_unittest passed (7/7) Signed-off-by: Felix-Gong <gongxiaofei24@iscas.ac.cn>
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Summary
UnalignedCopy64()with directld/sdinline assembly for 8-byte copyIncrementalCopy()with 8-byte bulk copies when source/dest don't overlapPerformance Improvement (direct function benchmark)
Changes
src/butil/third_party/snappy/snappy-stubs-internal.h: +11 linessrc/butil/third_party/snappy/snappy.cc: +24 linesTest Plan