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98988fc8e9
Import upstream zstd v1.5.5 to expose upstream's QAT integration.
Import from upstream commit 58b3ef79 [0]. This is one commit before the
tag v1.5.5-kernel [1], which is signed with upstream's signing key. The
next patch in the series imports from v1.5.5-kernel, and is included in
the series, rather than just importing directly from v1.5.5-kernel,
because it is a non-trivial patch applied to improve the kernel's
decompression speed. This commit contains 3 backported patches on top of
v1.5.5: Two from the Linux copy of zstd, and one from upstream's `dev`
branch.
In addition to keeping the kernel's copy of zstd up to date, this update
was requested by Intel to expose upstream zstd's external match provider
API to the kernel, which allows QAT to accelerate the LZ match finding
stage.
This commit was generated by:
export ZSTD=/path/to/repo/zstd/
export LINUX=/path/to/repo/linux/
cd "$ZSTD/contrib/linux-kernel"
git checkout v1.5.5-kernel~
make import LINUX="$LINUX"
I tested and benchmarked this commit on x86-64 with gcc-13.2.1 on an
Intel i9-9900K by running my benchmark scripts that benchmark zstd's
performance in btrfs and squashfs compressed filesystems. This commit
improves compression speed, especially for higher compression levels,
and regresses decompression speed. But the decompression speed
regression is addressed by the next patch in the series.
Component, Level, C. time delta, size delta, D. time delta
Btrfs , 1, -1.9%, +0.0%, +9.5%
Btrfs , 3, -5.6%, +0.0%, +7.4%
Btrfs , 5, -4.9%, +0.0%, +5.0%
Btrfs , 7, -5.7%, +0.0%, +5.2%
Btrfs , 9, -5.7%, +0.0%, +4.0%
Squashfs , 1, N/A, 0.0%, +11.6%
I also boot tested with a zstd compressed kernel on i386 and aarch64.
Link: 58b3ef79eb
Link: https://github.com/facebook/zstd/tree/v1.5.5-kernel
Signed-off-by: Nick Terrell <terrelln@fb.com>
962 lines
36 KiB
C
962 lines
36 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#include "zstd_compress_internal.h" /* ZSTD_hashPtr, ZSTD_count, ZSTD_storeSeq */
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#include "zstd_fast.h"
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static void ZSTD_fillHashTableForCDict(ZSTD_matchState_t* ms,
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const void* const end,
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ZSTD_dictTableLoadMethod_e dtlm)
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{
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const ZSTD_compressionParameters* const cParams = &ms->cParams;
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U32* const hashTable = ms->hashTable;
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U32 const hBits = cParams->hashLog + ZSTD_SHORT_CACHE_TAG_BITS;
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U32 const mls = cParams->minMatch;
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const BYTE* const base = ms->window.base;
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const BYTE* ip = base + ms->nextToUpdate;
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const BYTE* const iend = ((const BYTE*)end) - HASH_READ_SIZE;
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const U32 fastHashFillStep = 3;
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/* Currently, we always use ZSTD_dtlm_full for filling CDict tables.
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* Feel free to remove this assert if there's a good reason! */
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assert(dtlm == ZSTD_dtlm_full);
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/* Always insert every fastHashFillStep position into the hash table.
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* Insert the other positions if their hash entry is empty.
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*/
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for ( ; ip + fastHashFillStep < iend + 2; ip += fastHashFillStep) {
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U32 const curr = (U32)(ip - base);
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{ size_t const hashAndTag = ZSTD_hashPtr(ip, hBits, mls);
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ZSTD_writeTaggedIndex(hashTable, hashAndTag, curr); }
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if (dtlm == ZSTD_dtlm_fast) continue;
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/* Only load extra positions for ZSTD_dtlm_full */
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{ U32 p;
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for (p = 1; p < fastHashFillStep; ++p) {
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size_t const hashAndTag = ZSTD_hashPtr(ip + p, hBits, mls);
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if (hashTable[hashAndTag >> ZSTD_SHORT_CACHE_TAG_BITS] == 0) { /* not yet filled */
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ZSTD_writeTaggedIndex(hashTable, hashAndTag, curr + p);
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} } } }
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}
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static void ZSTD_fillHashTableForCCtx(ZSTD_matchState_t* ms,
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const void* const end,
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ZSTD_dictTableLoadMethod_e dtlm)
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{
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const ZSTD_compressionParameters* const cParams = &ms->cParams;
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U32* const hashTable = ms->hashTable;
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U32 const hBits = cParams->hashLog;
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U32 const mls = cParams->minMatch;
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const BYTE* const base = ms->window.base;
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const BYTE* ip = base + ms->nextToUpdate;
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const BYTE* const iend = ((const BYTE*)end) - HASH_READ_SIZE;
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const U32 fastHashFillStep = 3;
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/* Currently, we always use ZSTD_dtlm_fast for filling CCtx tables.
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* Feel free to remove this assert if there's a good reason! */
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assert(dtlm == ZSTD_dtlm_fast);
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/* Always insert every fastHashFillStep position into the hash table.
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* Insert the other positions if their hash entry is empty.
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*/
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for ( ; ip + fastHashFillStep < iend + 2; ip += fastHashFillStep) {
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U32 const curr = (U32)(ip - base);
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size_t const hash0 = ZSTD_hashPtr(ip, hBits, mls);
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hashTable[hash0] = curr;
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if (dtlm == ZSTD_dtlm_fast) continue;
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/* Only load extra positions for ZSTD_dtlm_full */
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{ U32 p;
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for (p = 1; p < fastHashFillStep; ++p) {
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size_t const hash = ZSTD_hashPtr(ip + p, hBits, mls);
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if (hashTable[hash] == 0) { /* not yet filled */
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hashTable[hash] = curr + p;
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} } } }
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}
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void ZSTD_fillHashTable(ZSTD_matchState_t* ms,
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const void* const end,
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ZSTD_dictTableLoadMethod_e dtlm,
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ZSTD_tableFillPurpose_e tfp)
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{
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if (tfp == ZSTD_tfp_forCDict) {
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ZSTD_fillHashTableForCDict(ms, end, dtlm);
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} else {
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ZSTD_fillHashTableForCCtx(ms, end, dtlm);
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}
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}
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/*
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* If you squint hard enough (and ignore repcodes), the search operation at any
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* given position is broken into 4 stages:
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*
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* 1. Hash (map position to hash value via input read)
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* 2. Lookup (map hash val to index via hashtable read)
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* 3. Load (map index to value at that position via input read)
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* 4. Compare
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*
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* Each of these steps involves a memory read at an address which is computed
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* from the previous step. This means these steps must be sequenced and their
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* latencies are cumulative.
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*
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* Rather than do 1->2->3->4 sequentially for a single position before moving
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* onto the next, this implementation interleaves these operations across the
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* next few positions:
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*
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* R = Repcode Read & Compare
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* H = Hash
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* T = Table Lookup
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* M = Match Read & Compare
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*
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* Pos | Time -->
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* ----+-------------------
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* N | ... M
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* N+1 | ... TM
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* N+2 | R H T M
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* N+3 | H TM
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* N+4 | R H T M
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* N+5 | H ...
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* N+6 | R ...
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*
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* This is very much analogous to the pipelining of execution in a CPU. And just
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* like a CPU, we have to dump the pipeline when we find a match (i.e., take a
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* branch).
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*
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* When this happens, we throw away our current state, and do the following prep
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* to re-enter the loop:
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*
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* Pos | Time -->
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* ----+-------------------
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* N | H T
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* N+1 | H
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*
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* This is also the work we do at the beginning to enter the loop initially.
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*/
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FORCE_INLINE_TEMPLATE size_t
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ZSTD_compressBlock_fast_noDict_generic(
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ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
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void const* src, size_t srcSize,
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U32 const mls, U32 const hasStep)
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{
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const ZSTD_compressionParameters* const cParams = &ms->cParams;
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U32* const hashTable = ms->hashTable;
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U32 const hlog = cParams->hashLog;
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/* support stepSize of 0 */
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size_t const stepSize = hasStep ? (cParams->targetLength + !(cParams->targetLength) + 1) : 2;
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const BYTE* const base = ms->window.base;
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const BYTE* const istart = (const BYTE*)src;
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const U32 endIndex = (U32)((size_t)(istart - base) + srcSize);
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const U32 prefixStartIndex = ZSTD_getLowestPrefixIndex(ms, endIndex, cParams->windowLog);
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const BYTE* const prefixStart = base + prefixStartIndex;
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const BYTE* const iend = istart + srcSize;
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const BYTE* const ilimit = iend - HASH_READ_SIZE;
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const BYTE* anchor = istart;
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const BYTE* ip0 = istart;
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const BYTE* ip1;
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const BYTE* ip2;
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const BYTE* ip3;
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U32 current0;
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U32 rep_offset1 = rep[0];
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U32 rep_offset2 = rep[1];
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U32 offsetSaved1 = 0, offsetSaved2 = 0;
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size_t hash0; /* hash for ip0 */
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size_t hash1; /* hash for ip1 */
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U32 idx; /* match idx for ip0 */
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U32 mval; /* src value at match idx */
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U32 offcode;
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const BYTE* match0;
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size_t mLength;
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/* ip0 and ip1 are always adjacent. The targetLength skipping and
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* uncompressibility acceleration is applied to every other position,
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* matching the behavior of #1562. step therefore represents the gap
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* between pairs of positions, from ip0 to ip2 or ip1 to ip3. */
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size_t step;
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const BYTE* nextStep;
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const size_t kStepIncr = (1 << (kSearchStrength - 1));
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DEBUGLOG(5, "ZSTD_compressBlock_fast_generic");
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ip0 += (ip0 == prefixStart);
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{ U32 const curr = (U32)(ip0 - base);
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U32 const windowLow = ZSTD_getLowestPrefixIndex(ms, curr, cParams->windowLog);
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U32 const maxRep = curr - windowLow;
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if (rep_offset2 > maxRep) offsetSaved2 = rep_offset2, rep_offset2 = 0;
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if (rep_offset1 > maxRep) offsetSaved1 = rep_offset1, rep_offset1 = 0;
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}
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/* start each op */
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_start: /* Requires: ip0 */
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step = stepSize;
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nextStep = ip0 + kStepIncr;
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/* calculate positions, ip0 - anchor == 0, so we skip step calc */
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ip1 = ip0 + 1;
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ip2 = ip0 + step;
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ip3 = ip2 + 1;
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if (ip3 >= ilimit) {
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goto _cleanup;
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}
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hash0 = ZSTD_hashPtr(ip0, hlog, mls);
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hash1 = ZSTD_hashPtr(ip1, hlog, mls);
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idx = hashTable[hash0];
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do {
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/* load repcode match for ip[2]*/
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const U32 rval = MEM_read32(ip2 - rep_offset1);
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/* write back hash table entry */
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current0 = (U32)(ip0 - base);
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hashTable[hash0] = current0;
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/* check repcode at ip[2] */
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if ((MEM_read32(ip2) == rval) & (rep_offset1 > 0)) {
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ip0 = ip2;
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match0 = ip0 - rep_offset1;
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mLength = ip0[-1] == match0[-1];
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ip0 -= mLength;
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match0 -= mLength;
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offcode = REPCODE1_TO_OFFBASE;
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mLength += 4;
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/* First write next hash table entry; we've already calculated it.
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* This write is known to be safe because the ip1 is before the
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* repcode (ip2). */
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hashTable[hash1] = (U32)(ip1 - base);
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goto _match;
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}
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/* load match for ip[0] */
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if (idx >= prefixStartIndex) {
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mval = MEM_read32(base + idx);
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} else {
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mval = MEM_read32(ip0) ^ 1; /* guaranteed to not match. */
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}
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/* check match at ip[0] */
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if (MEM_read32(ip0) == mval) {
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/* found a match! */
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/* First write next hash table entry; we've already calculated it.
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* This write is known to be safe because the ip1 == ip0 + 1, so
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* we know we will resume searching after ip1 */
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hashTable[hash1] = (U32)(ip1 - base);
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goto _offset;
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}
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/* lookup ip[1] */
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idx = hashTable[hash1];
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/* hash ip[2] */
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hash0 = hash1;
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hash1 = ZSTD_hashPtr(ip2, hlog, mls);
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/* advance to next positions */
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ip0 = ip1;
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ip1 = ip2;
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ip2 = ip3;
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/* write back hash table entry */
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current0 = (U32)(ip0 - base);
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hashTable[hash0] = current0;
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/* load match for ip[0] */
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if (idx >= prefixStartIndex) {
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mval = MEM_read32(base + idx);
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} else {
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mval = MEM_read32(ip0) ^ 1; /* guaranteed to not match. */
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}
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/* check match at ip[0] */
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if (MEM_read32(ip0) == mval) {
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/* found a match! */
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/* first write next hash table entry; we've already calculated it */
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if (step <= 4) {
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/* We need to avoid writing an index into the hash table >= the
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* position at which we will pick up our searching after we've
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* taken this match.
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*
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* The minimum possible match has length 4, so the earliest ip0
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* can be after we take this match will be the current ip0 + 4.
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* ip1 is ip0 + step - 1. If ip1 is >= ip0 + 4, we can't safely
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* write this position.
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*/
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hashTable[hash1] = (U32)(ip1 - base);
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}
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goto _offset;
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}
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/* lookup ip[1] */
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idx = hashTable[hash1];
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/* hash ip[2] */
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hash0 = hash1;
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hash1 = ZSTD_hashPtr(ip2, hlog, mls);
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/* advance to next positions */
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ip0 = ip1;
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ip1 = ip2;
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ip2 = ip0 + step;
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ip3 = ip1 + step;
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/* calculate step */
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if (ip2 >= nextStep) {
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step++;
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PREFETCH_L1(ip1 + 64);
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PREFETCH_L1(ip1 + 128);
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nextStep += kStepIncr;
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}
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} while (ip3 < ilimit);
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_cleanup:
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/* Note that there are probably still a couple positions we could search.
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* However, it seems to be a meaningful performance hit to try to search
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* them. So let's not. */
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/* When the repcodes are outside of the prefix, we set them to zero before the loop.
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* When the offsets are still zero, we need to restore them after the block to have a correct
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* repcode history. If only one offset was invalid, it is easy. The tricky case is when both
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* offsets were invalid. We need to figure out which offset to refill with.
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* - If both offsets are zero they are in the same order.
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* - If both offsets are non-zero, we won't restore the offsets from `offsetSaved[12]`.
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* - If only one is zero, we need to decide which offset to restore.
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* - If rep_offset1 is non-zero, then rep_offset2 must be offsetSaved1.
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* - It is impossible for rep_offset2 to be non-zero.
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*
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* So if rep_offset1 started invalid (offsetSaved1 != 0) and became valid (rep_offset1 != 0), then
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* set rep[0] = rep_offset1 and rep[1] = offsetSaved1.
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*/
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offsetSaved2 = ((offsetSaved1 != 0) && (rep_offset1 != 0)) ? offsetSaved1 : offsetSaved2;
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/* save reps for next block */
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rep[0] = rep_offset1 ? rep_offset1 : offsetSaved1;
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rep[1] = rep_offset2 ? rep_offset2 : offsetSaved2;
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/* Return the last literals size */
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return (size_t)(iend - anchor);
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_offset: /* Requires: ip0, idx */
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/* Compute the offset code. */
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match0 = base + idx;
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rep_offset2 = rep_offset1;
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rep_offset1 = (U32)(ip0-match0);
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offcode = OFFSET_TO_OFFBASE(rep_offset1);
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mLength = 4;
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|
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/* Count the backwards match length. */
|
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while (((ip0>anchor) & (match0>prefixStart)) && (ip0[-1] == match0[-1])) {
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ip0--;
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match0--;
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mLength++;
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}
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_match: /* Requires: ip0, match0, offcode */
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/* Count the forward length. */
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mLength += ZSTD_count(ip0 + mLength, match0 + mLength, iend);
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ZSTD_storeSeq(seqStore, (size_t)(ip0 - anchor), anchor, iend, offcode, mLength);
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ip0 += mLength;
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anchor = ip0;
|
|
|
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/* Fill table and check for immediate repcode. */
|
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if (ip0 <= ilimit) {
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/* Fill Table */
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assert(base+current0+2 > istart); /* check base overflow */
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hashTable[ZSTD_hashPtr(base+current0+2, hlog, mls)] = current0+2; /* here because current+2 could be > iend-8 */
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hashTable[ZSTD_hashPtr(ip0-2, hlog, mls)] = (U32)(ip0-2-base);
|
|
|
|
if (rep_offset2 > 0) { /* rep_offset2==0 means rep_offset2 is invalidated */
|
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while ( (ip0 <= ilimit) && (MEM_read32(ip0) == MEM_read32(ip0 - rep_offset2)) ) {
|
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/* store sequence */
|
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size_t const rLength = ZSTD_count(ip0+4, ip0+4-rep_offset2, iend) + 4;
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{ U32 const tmpOff = rep_offset2; rep_offset2 = rep_offset1; rep_offset1 = tmpOff; } /* swap rep_offset2 <=> rep_offset1 */
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hashTable[ZSTD_hashPtr(ip0, hlog, mls)] = (U32)(ip0-base);
|
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ip0 += rLength;
|
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ZSTD_storeSeq(seqStore, 0 /*litLen*/, anchor, iend, REPCODE1_TO_OFFBASE, rLength);
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anchor = ip0;
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continue; /* faster when present (confirmed on gcc-8) ... (?) */
|
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} } }
|
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|
|
goto _start;
|
|
}
|
|
|
|
#define ZSTD_GEN_FAST_FN(dictMode, mls, step) \
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|
static size_t ZSTD_compressBlock_fast_##dictMode##_##mls##_##step( \
|
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ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], \
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void const* src, size_t srcSize) \
|
|
{ \
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return ZSTD_compressBlock_fast_##dictMode##_generic(ms, seqStore, rep, src, srcSize, mls, step); \
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}
|
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|
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ZSTD_GEN_FAST_FN(noDict, 4, 1)
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ZSTD_GEN_FAST_FN(noDict, 5, 1)
|
|
ZSTD_GEN_FAST_FN(noDict, 6, 1)
|
|
ZSTD_GEN_FAST_FN(noDict, 7, 1)
|
|
|
|
ZSTD_GEN_FAST_FN(noDict, 4, 0)
|
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ZSTD_GEN_FAST_FN(noDict, 5, 0)
|
|
ZSTD_GEN_FAST_FN(noDict, 6, 0)
|
|
ZSTD_GEN_FAST_FN(noDict, 7, 0)
|
|
|
|
size_t ZSTD_compressBlock_fast(
|
|
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
|
|
void const* src, size_t srcSize)
|
|
{
|
|
U32 const mls = ms->cParams.minMatch;
|
|
assert(ms->dictMatchState == NULL);
|
|
if (ms->cParams.targetLength > 1) {
|
|
switch(mls)
|
|
{
|
|
default: /* includes case 3 */
|
|
case 4 :
|
|
return ZSTD_compressBlock_fast_noDict_4_1(ms, seqStore, rep, src, srcSize);
|
|
case 5 :
|
|
return ZSTD_compressBlock_fast_noDict_5_1(ms, seqStore, rep, src, srcSize);
|
|
case 6 :
|
|
return ZSTD_compressBlock_fast_noDict_6_1(ms, seqStore, rep, src, srcSize);
|
|
case 7 :
|
|
return ZSTD_compressBlock_fast_noDict_7_1(ms, seqStore, rep, src, srcSize);
|
|
}
|
|
} else {
|
|
switch(mls)
|
|
{
|
|
default: /* includes case 3 */
|
|
case 4 :
|
|
return ZSTD_compressBlock_fast_noDict_4_0(ms, seqStore, rep, src, srcSize);
|
|
case 5 :
|
|
return ZSTD_compressBlock_fast_noDict_5_0(ms, seqStore, rep, src, srcSize);
|
|
case 6 :
|
|
return ZSTD_compressBlock_fast_noDict_6_0(ms, seqStore, rep, src, srcSize);
|
|
case 7 :
|
|
return ZSTD_compressBlock_fast_noDict_7_0(ms, seqStore, rep, src, srcSize);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
FORCE_INLINE_TEMPLATE
|
|
size_t ZSTD_compressBlock_fast_dictMatchState_generic(
|
|
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
|
|
void const* src, size_t srcSize, U32 const mls, U32 const hasStep)
|
|
{
|
|
const ZSTD_compressionParameters* const cParams = &ms->cParams;
|
|
U32* const hashTable = ms->hashTable;
|
|
U32 const hlog = cParams->hashLog;
|
|
/* support stepSize of 0 */
|
|
U32 const stepSize = cParams->targetLength + !(cParams->targetLength);
|
|
const BYTE* const base = ms->window.base;
|
|
const BYTE* const istart = (const BYTE*)src;
|
|
const BYTE* ip0 = istart;
|
|
const BYTE* ip1 = ip0 + stepSize; /* we assert below that stepSize >= 1 */
|
|
const BYTE* anchor = istart;
|
|
const U32 prefixStartIndex = ms->window.dictLimit;
|
|
const BYTE* const prefixStart = base + prefixStartIndex;
|
|
const BYTE* const iend = istart + srcSize;
|
|
const BYTE* const ilimit = iend - HASH_READ_SIZE;
|
|
U32 offset_1=rep[0], offset_2=rep[1];
|
|
|
|
const ZSTD_matchState_t* const dms = ms->dictMatchState;
|
|
const ZSTD_compressionParameters* const dictCParams = &dms->cParams ;
|
|
const U32* const dictHashTable = dms->hashTable;
|
|
const U32 dictStartIndex = dms->window.dictLimit;
|
|
const BYTE* const dictBase = dms->window.base;
|
|
const BYTE* const dictStart = dictBase + dictStartIndex;
|
|
const BYTE* const dictEnd = dms->window.nextSrc;
|
|
const U32 dictIndexDelta = prefixStartIndex - (U32)(dictEnd - dictBase);
|
|
const U32 dictAndPrefixLength = (U32)(istart - prefixStart + dictEnd - dictStart);
|
|
const U32 dictHBits = dictCParams->hashLog + ZSTD_SHORT_CACHE_TAG_BITS;
|
|
|
|
/* if a dictionary is still attached, it necessarily means that
|
|
* it is within window size. So we just check it. */
|
|
const U32 maxDistance = 1U << cParams->windowLog;
|
|
const U32 endIndex = (U32)((size_t)(istart - base) + srcSize);
|
|
assert(endIndex - prefixStartIndex <= maxDistance);
|
|
(void)maxDistance; (void)endIndex; /* these variables are not used when assert() is disabled */
|
|
|
|
(void)hasStep; /* not currently specialized on whether it's accelerated */
|
|
|
|
/* ensure there will be no underflow
|
|
* when translating a dict index into a local index */
|
|
assert(prefixStartIndex >= (U32)(dictEnd - dictBase));
|
|
|
|
if (ms->prefetchCDictTables) {
|
|
size_t const hashTableBytes = (((size_t)1) << dictCParams->hashLog) * sizeof(U32);
|
|
PREFETCH_AREA(dictHashTable, hashTableBytes)
|
|
}
|
|
|
|
/* init */
|
|
DEBUGLOG(5, "ZSTD_compressBlock_fast_dictMatchState_generic");
|
|
ip0 += (dictAndPrefixLength == 0);
|
|
/* dictMatchState repCode checks don't currently handle repCode == 0
|
|
* disabling. */
|
|
assert(offset_1 <= dictAndPrefixLength);
|
|
assert(offset_2 <= dictAndPrefixLength);
|
|
|
|
/* Outer search loop */
|
|
assert(stepSize >= 1);
|
|
while (ip1 <= ilimit) { /* repcode check at (ip0 + 1) is safe because ip0 < ip1 */
|
|
size_t mLength;
|
|
size_t hash0 = ZSTD_hashPtr(ip0, hlog, mls);
|
|
|
|
size_t const dictHashAndTag0 = ZSTD_hashPtr(ip0, dictHBits, mls);
|
|
U32 dictMatchIndexAndTag = dictHashTable[dictHashAndTag0 >> ZSTD_SHORT_CACHE_TAG_BITS];
|
|
int dictTagsMatch = ZSTD_comparePackedTags(dictMatchIndexAndTag, dictHashAndTag0);
|
|
|
|
U32 matchIndex = hashTable[hash0];
|
|
U32 curr = (U32)(ip0 - base);
|
|
size_t step = stepSize;
|
|
const size_t kStepIncr = 1 << kSearchStrength;
|
|
const BYTE* nextStep = ip0 + kStepIncr;
|
|
|
|
/* Inner search loop */
|
|
while (1) {
|
|
const BYTE* match = base + matchIndex;
|
|
const U32 repIndex = curr + 1 - offset_1;
|
|
const BYTE* repMatch = (repIndex < prefixStartIndex) ?
|
|
dictBase + (repIndex - dictIndexDelta) :
|
|
base + repIndex;
|
|
const size_t hash1 = ZSTD_hashPtr(ip1, hlog, mls);
|
|
size_t const dictHashAndTag1 = ZSTD_hashPtr(ip1, dictHBits, mls);
|
|
hashTable[hash0] = curr; /* update hash table */
|
|
|
|
if (((U32) ((prefixStartIndex - 1) - repIndex) >=
|
|
3) /* intentional underflow : ensure repIndex isn't overlapping dict + prefix */
|
|
&& (MEM_read32(repMatch) == MEM_read32(ip0 + 1))) {
|
|
const BYTE* const repMatchEnd = repIndex < prefixStartIndex ? dictEnd : iend;
|
|
mLength = ZSTD_count_2segments(ip0 + 1 + 4, repMatch + 4, iend, repMatchEnd, prefixStart) + 4;
|
|
ip0++;
|
|
ZSTD_storeSeq(seqStore, (size_t) (ip0 - anchor), anchor, iend, REPCODE1_TO_OFFBASE, mLength);
|
|
break;
|
|
}
|
|
|
|
if (dictTagsMatch) {
|
|
/* Found a possible dict match */
|
|
const U32 dictMatchIndex = dictMatchIndexAndTag >> ZSTD_SHORT_CACHE_TAG_BITS;
|
|
const BYTE* dictMatch = dictBase + dictMatchIndex;
|
|
if (dictMatchIndex > dictStartIndex &&
|
|
MEM_read32(dictMatch) == MEM_read32(ip0)) {
|
|
/* To replicate extDict parse behavior, we only use dict matches when the normal matchIndex is invalid */
|
|
if (matchIndex <= prefixStartIndex) {
|
|
U32 const offset = (U32) (curr - dictMatchIndex - dictIndexDelta);
|
|
mLength = ZSTD_count_2segments(ip0 + 4, dictMatch + 4, iend, dictEnd, prefixStart) + 4;
|
|
while (((ip0 > anchor) & (dictMatch > dictStart))
|
|
&& (ip0[-1] == dictMatch[-1])) {
|
|
ip0--;
|
|
dictMatch--;
|
|
mLength++;
|
|
} /* catch up */
|
|
offset_2 = offset_1;
|
|
offset_1 = offset;
|
|
ZSTD_storeSeq(seqStore, (size_t) (ip0 - anchor), anchor, iend, OFFSET_TO_OFFBASE(offset), mLength);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (matchIndex > prefixStartIndex && MEM_read32(match) == MEM_read32(ip0)) {
|
|
/* found a regular match */
|
|
U32 const offset = (U32) (ip0 - match);
|
|
mLength = ZSTD_count(ip0 + 4, match + 4, iend) + 4;
|
|
while (((ip0 > anchor) & (match > prefixStart))
|
|
&& (ip0[-1] == match[-1])) {
|
|
ip0--;
|
|
match--;
|
|
mLength++;
|
|
} /* catch up */
|
|
offset_2 = offset_1;
|
|
offset_1 = offset;
|
|
ZSTD_storeSeq(seqStore, (size_t) (ip0 - anchor), anchor, iend, OFFSET_TO_OFFBASE(offset), mLength);
|
|
break;
|
|
}
|
|
|
|
/* Prepare for next iteration */
|
|
dictMatchIndexAndTag = dictHashTable[dictHashAndTag1 >> ZSTD_SHORT_CACHE_TAG_BITS];
|
|
dictTagsMatch = ZSTD_comparePackedTags(dictMatchIndexAndTag, dictHashAndTag1);
|
|
matchIndex = hashTable[hash1];
|
|
|
|
if (ip1 >= nextStep) {
|
|
step++;
|
|
nextStep += kStepIncr;
|
|
}
|
|
ip0 = ip1;
|
|
ip1 = ip1 + step;
|
|
if (ip1 > ilimit) goto _cleanup;
|
|
|
|
curr = (U32)(ip0 - base);
|
|
hash0 = hash1;
|
|
} /* end inner search loop */
|
|
|
|
/* match found */
|
|
assert(mLength);
|
|
ip0 += mLength;
|
|
anchor = ip0;
|
|
|
|
if (ip0 <= ilimit) {
|
|
/* Fill Table */
|
|
assert(base+curr+2 > istart); /* check base overflow */
|
|
hashTable[ZSTD_hashPtr(base+curr+2, hlog, mls)] = curr+2; /* here because curr+2 could be > iend-8 */
|
|
hashTable[ZSTD_hashPtr(ip0-2, hlog, mls)] = (U32)(ip0-2-base);
|
|
|
|
/* check immediate repcode */
|
|
while (ip0 <= ilimit) {
|
|
U32 const current2 = (U32)(ip0-base);
|
|
U32 const repIndex2 = current2 - offset_2;
|
|
const BYTE* repMatch2 = repIndex2 < prefixStartIndex ?
|
|
dictBase - dictIndexDelta + repIndex2 :
|
|
base + repIndex2;
|
|
if ( ((U32)((prefixStartIndex-1) - (U32)repIndex2) >= 3 /* intentional overflow */)
|
|
&& (MEM_read32(repMatch2) == MEM_read32(ip0))) {
|
|
const BYTE* const repEnd2 = repIndex2 < prefixStartIndex ? dictEnd : iend;
|
|
size_t const repLength2 = ZSTD_count_2segments(ip0+4, repMatch2+4, iend, repEnd2, prefixStart) + 4;
|
|
U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */
|
|
ZSTD_storeSeq(seqStore, 0, anchor, iend, REPCODE1_TO_OFFBASE, repLength2);
|
|
hashTable[ZSTD_hashPtr(ip0, hlog, mls)] = current2;
|
|
ip0 += repLength2;
|
|
anchor = ip0;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Prepare for next iteration */
|
|
assert(ip0 == anchor);
|
|
ip1 = ip0 + stepSize;
|
|
}
|
|
|
|
_cleanup:
|
|
/* save reps for next block */
|
|
rep[0] = offset_1;
|
|
rep[1] = offset_2;
|
|
|
|
/* Return the last literals size */
|
|
return (size_t)(iend - anchor);
|
|
}
|
|
|
|
|
|
ZSTD_GEN_FAST_FN(dictMatchState, 4, 0)
|
|
ZSTD_GEN_FAST_FN(dictMatchState, 5, 0)
|
|
ZSTD_GEN_FAST_FN(dictMatchState, 6, 0)
|
|
ZSTD_GEN_FAST_FN(dictMatchState, 7, 0)
|
|
|
|
size_t ZSTD_compressBlock_fast_dictMatchState(
|
|
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
|
|
void const* src, size_t srcSize)
|
|
{
|
|
U32 const mls = ms->cParams.minMatch;
|
|
assert(ms->dictMatchState != NULL);
|
|
switch(mls)
|
|
{
|
|
default: /* includes case 3 */
|
|
case 4 :
|
|
return ZSTD_compressBlock_fast_dictMatchState_4_0(ms, seqStore, rep, src, srcSize);
|
|
case 5 :
|
|
return ZSTD_compressBlock_fast_dictMatchState_5_0(ms, seqStore, rep, src, srcSize);
|
|
case 6 :
|
|
return ZSTD_compressBlock_fast_dictMatchState_6_0(ms, seqStore, rep, src, srcSize);
|
|
case 7 :
|
|
return ZSTD_compressBlock_fast_dictMatchState_7_0(ms, seqStore, rep, src, srcSize);
|
|
}
|
|
}
|
|
|
|
|
|
static size_t ZSTD_compressBlock_fast_extDict_generic(
|
|
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
|
|
void const* src, size_t srcSize, U32 const mls, U32 const hasStep)
|
|
{
|
|
const ZSTD_compressionParameters* const cParams = &ms->cParams;
|
|
U32* const hashTable = ms->hashTable;
|
|
U32 const hlog = cParams->hashLog;
|
|
/* support stepSize of 0 */
|
|
size_t const stepSize = cParams->targetLength + !(cParams->targetLength) + 1;
|
|
const BYTE* const base = ms->window.base;
|
|
const BYTE* const dictBase = ms->window.dictBase;
|
|
const BYTE* const istart = (const BYTE*)src;
|
|
const BYTE* anchor = istart;
|
|
const U32 endIndex = (U32)((size_t)(istart - base) + srcSize);
|
|
const U32 lowLimit = ZSTD_getLowestMatchIndex(ms, endIndex, cParams->windowLog);
|
|
const U32 dictStartIndex = lowLimit;
|
|
const BYTE* const dictStart = dictBase + dictStartIndex;
|
|
const U32 dictLimit = ms->window.dictLimit;
|
|
const U32 prefixStartIndex = dictLimit < lowLimit ? lowLimit : dictLimit;
|
|
const BYTE* const prefixStart = base + prefixStartIndex;
|
|
const BYTE* const dictEnd = dictBase + prefixStartIndex;
|
|
const BYTE* const iend = istart + srcSize;
|
|
const BYTE* const ilimit = iend - 8;
|
|
U32 offset_1=rep[0], offset_2=rep[1];
|
|
U32 offsetSaved1 = 0, offsetSaved2 = 0;
|
|
|
|
const BYTE* ip0 = istart;
|
|
const BYTE* ip1;
|
|
const BYTE* ip2;
|
|
const BYTE* ip3;
|
|
U32 current0;
|
|
|
|
|
|
size_t hash0; /* hash for ip0 */
|
|
size_t hash1; /* hash for ip1 */
|
|
U32 idx; /* match idx for ip0 */
|
|
const BYTE* idxBase; /* base pointer for idx */
|
|
|
|
U32 offcode;
|
|
const BYTE* match0;
|
|
size_t mLength;
|
|
const BYTE* matchEnd = 0; /* initialize to avoid warning, assert != 0 later */
|
|
|
|
size_t step;
|
|
const BYTE* nextStep;
|
|
const size_t kStepIncr = (1 << (kSearchStrength - 1));
|
|
|
|
(void)hasStep; /* not currently specialized on whether it's accelerated */
|
|
|
|
DEBUGLOG(5, "ZSTD_compressBlock_fast_extDict_generic (offset_1=%u)", offset_1);
|
|
|
|
/* switch to "regular" variant if extDict is invalidated due to maxDistance */
|
|
if (prefixStartIndex == dictStartIndex)
|
|
return ZSTD_compressBlock_fast(ms, seqStore, rep, src, srcSize);
|
|
|
|
{ U32 const curr = (U32)(ip0 - base);
|
|
U32 const maxRep = curr - dictStartIndex;
|
|
if (offset_2 >= maxRep) offsetSaved2 = offset_2, offset_2 = 0;
|
|
if (offset_1 >= maxRep) offsetSaved1 = offset_1, offset_1 = 0;
|
|
}
|
|
|
|
/* start each op */
|
|
_start: /* Requires: ip0 */
|
|
|
|
step = stepSize;
|
|
nextStep = ip0 + kStepIncr;
|
|
|
|
/* calculate positions, ip0 - anchor == 0, so we skip step calc */
|
|
ip1 = ip0 + 1;
|
|
ip2 = ip0 + step;
|
|
ip3 = ip2 + 1;
|
|
|
|
if (ip3 >= ilimit) {
|
|
goto _cleanup;
|
|
}
|
|
|
|
hash0 = ZSTD_hashPtr(ip0, hlog, mls);
|
|
hash1 = ZSTD_hashPtr(ip1, hlog, mls);
|
|
|
|
idx = hashTable[hash0];
|
|
idxBase = idx < prefixStartIndex ? dictBase : base;
|
|
|
|
do {
|
|
{ /* load repcode match for ip[2] */
|
|
U32 const current2 = (U32)(ip2 - base);
|
|
U32 const repIndex = current2 - offset_1;
|
|
const BYTE* const repBase = repIndex < prefixStartIndex ? dictBase : base;
|
|
U32 rval;
|
|
if ( ((U32)(prefixStartIndex - repIndex) >= 4) /* intentional underflow */
|
|
& (offset_1 > 0) ) {
|
|
rval = MEM_read32(repBase + repIndex);
|
|
} else {
|
|
rval = MEM_read32(ip2) ^ 1; /* guaranteed to not match. */
|
|
}
|
|
|
|
/* write back hash table entry */
|
|
current0 = (U32)(ip0 - base);
|
|
hashTable[hash0] = current0;
|
|
|
|
/* check repcode at ip[2] */
|
|
if (MEM_read32(ip2) == rval) {
|
|
ip0 = ip2;
|
|
match0 = repBase + repIndex;
|
|
matchEnd = repIndex < prefixStartIndex ? dictEnd : iend;
|
|
assert((match0 != prefixStart) & (match0 != dictStart));
|
|
mLength = ip0[-1] == match0[-1];
|
|
ip0 -= mLength;
|
|
match0 -= mLength;
|
|
offcode = REPCODE1_TO_OFFBASE;
|
|
mLength += 4;
|
|
goto _match;
|
|
} }
|
|
|
|
{ /* load match for ip[0] */
|
|
U32 const mval = idx >= dictStartIndex ?
|
|
MEM_read32(idxBase + idx) :
|
|
MEM_read32(ip0) ^ 1; /* guaranteed not to match */
|
|
|
|
/* check match at ip[0] */
|
|
if (MEM_read32(ip0) == mval) {
|
|
/* found a match! */
|
|
goto _offset;
|
|
} }
|
|
|
|
/* lookup ip[1] */
|
|
idx = hashTable[hash1];
|
|
idxBase = idx < prefixStartIndex ? dictBase : base;
|
|
|
|
/* hash ip[2] */
|
|
hash0 = hash1;
|
|
hash1 = ZSTD_hashPtr(ip2, hlog, mls);
|
|
|
|
/* advance to next positions */
|
|
ip0 = ip1;
|
|
ip1 = ip2;
|
|
ip2 = ip3;
|
|
|
|
/* write back hash table entry */
|
|
current0 = (U32)(ip0 - base);
|
|
hashTable[hash0] = current0;
|
|
|
|
{ /* load match for ip[0] */
|
|
U32 const mval = idx >= dictStartIndex ?
|
|
MEM_read32(idxBase + idx) :
|
|
MEM_read32(ip0) ^ 1; /* guaranteed not to match */
|
|
|
|
/* check match at ip[0] */
|
|
if (MEM_read32(ip0) == mval) {
|
|
/* found a match! */
|
|
goto _offset;
|
|
} }
|
|
|
|
/* lookup ip[1] */
|
|
idx = hashTable[hash1];
|
|
idxBase = idx < prefixStartIndex ? dictBase : base;
|
|
|
|
/* hash ip[2] */
|
|
hash0 = hash1;
|
|
hash1 = ZSTD_hashPtr(ip2, hlog, mls);
|
|
|
|
/* advance to next positions */
|
|
ip0 = ip1;
|
|
ip1 = ip2;
|
|
ip2 = ip0 + step;
|
|
ip3 = ip1 + step;
|
|
|
|
/* calculate step */
|
|
if (ip2 >= nextStep) {
|
|
step++;
|
|
PREFETCH_L1(ip1 + 64);
|
|
PREFETCH_L1(ip1 + 128);
|
|
nextStep += kStepIncr;
|
|
}
|
|
} while (ip3 < ilimit);
|
|
|
|
_cleanup:
|
|
/* Note that there are probably still a couple positions we could search.
|
|
* However, it seems to be a meaningful performance hit to try to search
|
|
* them. So let's not. */
|
|
|
|
/* If offset_1 started invalid (offsetSaved1 != 0) and became valid (offset_1 != 0),
|
|
* rotate saved offsets. See comment in ZSTD_compressBlock_fast_noDict for more context. */
|
|
offsetSaved2 = ((offsetSaved1 != 0) && (offset_1 != 0)) ? offsetSaved1 : offsetSaved2;
|
|
|
|
/* save reps for next block */
|
|
rep[0] = offset_1 ? offset_1 : offsetSaved1;
|
|
rep[1] = offset_2 ? offset_2 : offsetSaved2;
|
|
|
|
/* Return the last literals size */
|
|
return (size_t)(iend - anchor);
|
|
|
|
_offset: /* Requires: ip0, idx, idxBase */
|
|
|
|
/* Compute the offset code. */
|
|
{ U32 const offset = current0 - idx;
|
|
const BYTE* const lowMatchPtr = idx < prefixStartIndex ? dictStart : prefixStart;
|
|
matchEnd = idx < prefixStartIndex ? dictEnd : iend;
|
|
match0 = idxBase + idx;
|
|
offset_2 = offset_1;
|
|
offset_1 = offset;
|
|
offcode = OFFSET_TO_OFFBASE(offset);
|
|
mLength = 4;
|
|
|
|
/* Count the backwards match length. */
|
|
while (((ip0>anchor) & (match0>lowMatchPtr)) && (ip0[-1] == match0[-1])) {
|
|
ip0--;
|
|
match0--;
|
|
mLength++;
|
|
} }
|
|
|
|
_match: /* Requires: ip0, match0, offcode, matchEnd */
|
|
|
|
/* Count the forward length. */
|
|
assert(matchEnd != 0);
|
|
mLength += ZSTD_count_2segments(ip0 + mLength, match0 + mLength, iend, matchEnd, prefixStart);
|
|
|
|
ZSTD_storeSeq(seqStore, (size_t)(ip0 - anchor), anchor, iend, offcode, mLength);
|
|
|
|
ip0 += mLength;
|
|
anchor = ip0;
|
|
|
|
/* write next hash table entry */
|
|
if (ip1 < ip0) {
|
|
hashTable[hash1] = (U32)(ip1 - base);
|
|
}
|
|
|
|
/* Fill table and check for immediate repcode. */
|
|
if (ip0 <= ilimit) {
|
|
/* Fill Table */
|
|
assert(base+current0+2 > istart); /* check base overflow */
|
|
hashTable[ZSTD_hashPtr(base+current0+2, hlog, mls)] = current0+2; /* here because current+2 could be > iend-8 */
|
|
hashTable[ZSTD_hashPtr(ip0-2, hlog, mls)] = (U32)(ip0-2-base);
|
|
|
|
while (ip0 <= ilimit) {
|
|
U32 const repIndex2 = (U32)(ip0-base) - offset_2;
|
|
const BYTE* const repMatch2 = repIndex2 < prefixStartIndex ? dictBase + repIndex2 : base + repIndex2;
|
|
if ( (((U32)((prefixStartIndex-1) - repIndex2) >= 3) & (offset_2 > 0)) /* intentional underflow */
|
|
&& (MEM_read32(repMatch2) == MEM_read32(ip0)) ) {
|
|
const BYTE* const repEnd2 = repIndex2 < prefixStartIndex ? dictEnd : iend;
|
|
size_t const repLength2 = ZSTD_count_2segments(ip0+4, repMatch2+4, iend, repEnd2, prefixStart) + 4;
|
|
{ U32 const tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; } /* swap offset_2 <=> offset_1 */
|
|
ZSTD_storeSeq(seqStore, 0 /*litlen*/, anchor, iend, REPCODE1_TO_OFFBASE, repLength2);
|
|
hashTable[ZSTD_hashPtr(ip0, hlog, mls)] = (U32)(ip0-base);
|
|
ip0 += repLength2;
|
|
anchor = ip0;
|
|
continue;
|
|
}
|
|
break;
|
|
} }
|
|
|
|
goto _start;
|
|
}
|
|
|
|
ZSTD_GEN_FAST_FN(extDict, 4, 0)
|
|
ZSTD_GEN_FAST_FN(extDict, 5, 0)
|
|
ZSTD_GEN_FAST_FN(extDict, 6, 0)
|
|
ZSTD_GEN_FAST_FN(extDict, 7, 0)
|
|
|
|
size_t ZSTD_compressBlock_fast_extDict(
|
|
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
|
|
void const* src, size_t srcSize)
|
|
{
|
|
U32 const mls = ms->cParams.minMatch;
|
|
assert(ms->dictMatchState == NULL);
|
|
switch(mls)
|
|
{
|
|
default: /* includes case 3 */
|
|
case 4 :
|
|
return ZSTD_compressBlock_fast_extDict_4_0(ms, seqStore, rep, src, srcSize);
|
|
case 5 :
|
|
return ZSTD_compressBlock_fast_extDict_5_0(ms, seqStore, rep, src, srcSize);
|
|
case 6 :
|
|
return ZSTD_compressBlock_fast_extDict_6_0(ms, seqStore, rep, src, srcSize);
|
|
case 7 :
|
|
return ZSTD_compressBlock_fast_extDict_7_0(ms, seqStore, rep, src, srcSize);
|
|
}
|
|
}
|