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feat(compress): move reduce-index policy into Rust

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Move match-table selection and btlazy2 marker policy out of the C overflow
correction wrapper. Rust now decides whether chain and hash3 tables
participate using the strategy, row-matchfinder, dedicated-dictionary, and
log inputs, then delegates cell updates to the existing Rust reducer. C
retains only the private table pointers and scalar projection.

Test Plan:
- cargo fmt --manifest-path rust/Cargo.toml -- --check
- ulimit -v 41943040 && CARGO_BUILD_JOBS=1 cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings
- ulimit -v 41943040 && CARGO_BUILD_JOBS=1 cargo test --manifest-path rust/Cargo.toml zstd_compress::tests::reduce_index_for_match_state -- --nocapture
- ulimit -v 41943040 && make -j1
- ulimit -v 41943040 && make -j1 -C tests test-fuzzer FUZZERTEST=-T3s FUZZER_FLAGS=--no-big-tests
This commit is contained in:
ddidderr
2026-07-19 21:05:48 +02:00
parent dae40246aa
commit 481a53baf8
2 changed files with 89 additions and 21 deletions
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lib/compress/zstd_compress.c
+12 -21
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@@ -656,6 +656,12 @@ void ZSTD_rust_reduceIndex(U32* hashTable, U32 hashSize,
U32* chainTable, U32 chainSize,
U32* hashTable3, U32 hashSize3,
U32 reducerValue, int preserveChainMark);
void ZSTD_rust_reduceIndexForMatchState(
U32* hashTable, U32 hashLog,
U32* chainTable, U32 chainLog,
U32* hashTable3, U32 hashLog3,
int strategy, int useRowMatchFinder, int dedicatedDictSearch,
U32 reducerValue);
typedef int (*ZSTD_rust_overflowNeedCorrection_f)(
void* context, const void* src, const void* srcEnd);
typedef U32 (*ZSTD_rust_overflowCorrect_f)(
@@ -4803,27 +4809,12 @@ size_t ZSTD_copyCCtx(ZSTD_CCtx* dstCCtx, const ZSTD_CCtx* srcCCtx, unsigned long
* rescale all indexes to avoid future overflow (indexes are U32) */
static void ZSTD_reduceIndex (ZSTD_MatchState_t* ms, ZSTD_CCtx_params const* params, const U32 reducerValue)
{
U32 const hSize = (U32)1 << params->cParams.hashLog;
U32* chainTable = NULL;
U32 chainSize = 0;
U32* hashTable3 = NULL;
U32 hashSize3 = 0;
if (ZSTD_allocateChainTable(params->cParams.strategy, params->useRowMatchFinder, (U32)ms->dedicatedDictSearch)) {
chainTable = ms->chainTable;
chainSize = (U32)1 << params->cParams.chainLog;
}
if (ms->hashLog3) {
hashTable3 = ms->hashTable3;
hashSize3 = (U32)1 << ms->hashLog3;
}
ZSTD_rust_reduceIndex(ms->hashTable, hSize,
chainTable, chainSize,
hashTable3, hashSize3,
reducerValue,
params->cParams.strategy == ZSTD_btlazy2);
ZSTD_rust_reduceIndexForMatchState(
ms->hashTable, params->cParams.hashLog,
ms->chainTable, params->cParams.chainLog,
ms->hashTable3, ms->hashLog3,
params->cParams.strategy, params->useRowMatchFinder,
ms->dedicatedDictSearch, reducerValue);
}