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Merge 4a455a1669 into 82d322c497

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Ilya Tokar 2026-08-08 21:01:13 +00:00 • committed by GitHub
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13
lib/decompress/zstd_decompress_block.c
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@ -39,6 +39,7 @@
#error "Cannot force the use of the short and the long ZSTD_decompressSequences variants!"
#endif
#define PREFETCH_DISTANCE (8*CACHELINE_SIZE)
/*_*******************************************************
* Memory operations
@ -1514,6 +1515,8 @@ ZSTD_decompressSequences_bodySplitLitBuffer( ZSTD_DCtx* dctx,
const BYTE* const prefixStart = (const BYTE*) (dctx->prefixStart);
const BYTE* const vBase = (const BYTE*) (dctx->virtualStart);
const BYTE* const dictEnd = (const BYTE*) (dctx->dictEnd);
int counter = 0;
const int kPrefetchRatio = 16;
DEBUGLOG(5, "ZSTD_decompressSequences_bodySplitLitBuffer (%i seqs)", nbSeq);
/* Literals are split between internal buffer & output buffer */
@ -1601,6 +1604,12 @@ ZSTD_decompressSequences_bodySplitLitBuffer( ZSTD_DCtx* dctx,
sequence = ZSTD_decodeSequence(&seqState, isLongOffset, nbSeq==1);
if (litPtr + sequence.litLength > dctx->litBufferEnd) break;
{ size_t const oneSeqSize = ZSTD_execSequenceSplitLitBuffer(op, oend, litPtr + sequence.litLength - WILDCOPY_OVERLENGTH, sequence, &litPtr, litBufferEnd, prefixStart, vBase, dictEnd);
/* Don't prefetch too often, because it is actually slower */
counter++;
if ((counter / kPrefetchRatio) == 0) {
PREFETCH_L1(op+PREFETCH_DISTANCE);
PREFETCH_L1(litPtr+PREFETCH_DISTANCE);
}
#if defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION) && defined(FUZZING_ASSERT_VALID_SEQUENCE)
assert(!ZSTD_isError(oneSeqSize));
ZSTD_assertValidSequence(dctx, op, oend, sequence, prefixStart, vBase);
@ -1663,6 +1672,8 @@ ZSTD_decompressSequences_bodySplitLitBuffer( ZSTD_DCtx* dctx,
for ( ; nbSeq ; nbSeq--) {
seq_t const sequence = ZSTD_decodeSequence(&seqState, isLongOffset, nbSeq==1);
size_t const oneSeqSize = ZSTD_execSequence(op, oend, sequence, &litPtr, litBufferEnd, prefixStart, vBase, dictEnd);
PREFETCH_L1(op+PREFETCH_DISTANCE);
PREFETCH_L1(litPtr+PREFETCH_DISTANCE);
#if defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION) && defined(FUZZING_ASSERT_VALID_SEQUENCE)
assert(!ZSTD_isError(oneSeqSize));
ZSTD_assertValidSequence(dctx, op, oend, sequence, prefixStart, vBase);
@ -1759,6 +1770,8 @@ ZSTD_decompressSequences_body(ZSTD_DCtx* dctx,
for ( ; nbSeq ; nbSeq--) {
seq_t const sequence = ZSTD_decodeSequence(&seqState, isLongOffset, nbSeq==1);
size_t const oneSeqSize = ZSTD_execSequence(op, oend, sequence, &litPtr, litEnd, prefixStart, vBase, dictEnd);
PREFETCH_L1(op+PREFETCH_DISTANCE);
PREFETCH_L1(litPtr+PREFETCH_DISTANCE);
#if defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION) && defined(FUZZING_ASSERT_VALID_SEQUENCE)
assert(!ZSTD_isError(oneSeqSize));
ZSTD_assertValidSequence(dctx, op, oend, sequence, prefixStart, vBase);