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changed hashEveryLog into hashRateLog

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This commit is contained in:
Yann Collet 2018-11-21 14:36:57 -08:00
parent 5d3592398d
commit 41c7d0b1e1
17 changed files with 52 additions and 52 deletions
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4
doc/zstd_manual.html
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@ -461,12 +461,12 @@ size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
* Larger values improve collision resolution but decrease compression speed.
* The maximum value is ZSTD_LDM_BUCKETSIZELOG_MAX.
* Special: value 0 means "use default value" (default: 3). */
ZSTD_p_ldmHashEveryLog=164, </b>/* Frequency of inserting/looking up entries into the LDM hash table.<b>
ZSTD_p_ldmHashRateLog=164, </b>/* Frequency of inserting/looking up entries into the LDM hash table.<b>
* Must be clamped between 0 and (ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN).
* Default is MAX(0, (windowLog - ldmHashLog)), optimizing hash table usage.
* Larger values improve compression speed.
* Deviating far from default value will likely result in a compression ratio decrease.
* Special: value 0 means "automatically determine hashEveryLog". */
* Special: value 0 means "automatically determine hashRateLog". */
</b>/* frame parameters */<b>
ZSTD_p_contentSizeFlag=200, </b>/* Content size will be written into frame header _whenever known_ (default:1)<b>

24
lib/compress/zstd_compress.c
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@ -330,9 +330,9 @@ ZSTD_bounds ZSTD_cParam_getBounds(ZSTD_cParameter param)
bounds.upperBound = ZSTD_LDM_BUCKETSIZELOG_MAX;
return bounds;
case ZSTD_p_ldmHashEveryLog:
bounds.lowerBound = ZSTD_LDM_HASHEVERYLOG_MIN;
bounds.upperBound = ZSTD_LDM_HASHEVERYLOG_MAX;
case ZSTD_p_ldmHashRateLog:
bounds.lowerBound = ZSTD_LDM_HASHRATELOG_MIN;
bounds.upperBound = ZSTD_LDM_HASHRATELOG_MAX;
return bounds;
/* experimental parameters */
@ -397,7 +397,7 @@ static int ZSTD_isUpdateAuthorized(ZSTD_cParameter param)
case ZSTD_p_ldmHashLog:
case ZSTD_p_ldmMinMatch:
case ZSTD_p_ldmBucketSizeLog:
case ZSTD_p_ldmHashEveryLog:
case ZSTD_p_ldmHashRateLog:
case ZSTD_p_forceAttachDict:
default:
return 0;
@ -461,7 +461,7 @@ size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, int value)
case ZSTD_p_ldmHashLog:
case ZSTD_p_ldmMinMatch:
case ZSTD_p_ldmBucketSizeLog:
case ZSTD_p_ldmHashEveryLog:
case ZSTD_p_ldmHashRateLog:
if (cctx->cdict) return ERROR(stage_wrong);
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
@ -610,11 +610,11 @@ size_t ZSTD_CCtxParam_setParameter(ZSTD_CCtx_params* CCtxParams,
CCtxParams->ldmParams.bucketSizeLog = value;
return CCtxParams->ldmParams.bucketSizeLog;
case ZSTD_p_ldmHashEveryLog :
case ZSTD_p_ldmHashRateLog :
if (value > ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN)
return ERROR(parameter_outOfBound);
CCtxParams->ldmParams.hashEveryLog = value;
return CCtxParams->ldmParams.hashEveryLog;
CCtxParams->ldmParams.hashRateLog = value;
return CCtxParams->ldmParams.hashRateLog;
default: return ERROR(parameter_unsupported);
}
@ -711,8 +711,8 @@ size_t ZSTD_CCtxParam_getParameter(
case ZSTD_p_ldmBucketSizeLog :
*value = CCtxParams->ldmParams.bucketSizeLog;
break;
case ZSTD_p_ldmHashEveryLog :
*value = CCtxParams->ldmParams.hashEveryLog;
case ZSTD_p_ldmHashRateLog :
*value = CCtxParams->ldmParams.hashRateLog;
break;
default: return ERROR(parameter_unsupported);
}
@ -1119,7 +1119,7 @@ static U32 ZSTD_equivalentLdmParams(ldmParams_t ldmParams1,
ldmParams1.hashLog == ldmParams2.hashLog &&
ldmParams1.bucketSizeLog == ldmParams2.bucketSizeLog &&
ldmParams1.minMatchLength == ldmParams2.minMatchLength &&
ldmParams1.hashEveryLog == ldmParams2.hashEveryLog);
ldmParams1.hashRateLog == ldmParams2.hashRateLog);
}
typedef enum { ZSTDb_not_buffered, ZSTDb_buffered } ZSTD_buffered_policy_e;
@ -1317,7 +1317,7 @@ static size_t ZSTD_resetCCtx_internal(ZSTD_CCtx* zc,
/* Adjust long distance matching parameters */
ZSTD_ldm_adjustParameters(&params.ldmParams, &params.cParams);
assert(params.ldmParams.hashLog >= params.ldmParams.bucketSizeLog);
assert(params.ldmParams.hashEveryLog < 32);
assert(params.ldmParams.hashRateLog < 32);
zc->ldmState.hashPower = ZSTD_rollingHash_primePower(params.ldmParams.minMatchLength);
}

2
lib/compress/zstd_compress_internal.h
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@ -161,7 +161,7 @@ typedef struct {
U32 hashLog; /* Log size of hashTable */
U32 bucketSizeLog; /* Log bucket size for collision resolution, at most 8 */
U32 minMatchLength; /* Minimum match length */
U32 hashEveryLog; /* Log number of entries to skip */
U32 hashRateLog; /* Log number of entries to skip */
U32 windowLog; /* Window log for the LDM */
} ldmParams_t;

18
lib/compress/zstd_ldm.c
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@ -37,8 +37,8 @@ void ZSTD_ldm_adjustParameters(ldmParams_t* params,
params->hashLog = MAX(ZSTD_HASHLOG_MIN, params->windowLog - LDM_HASH_RLOG);
assert(params->hashLog <= ZSTD_HASHLOG_MAX);
}
if (params->hashEveryLog == 0) {
params->hashEveryLog = params->windowLog < params->hashLog
if (params->hashRateLog == 0) {
params->hashRateLog = params->windowLog < params->hashLog
? 0
: params->windowLog - params->hashLog;
}
@ -119,20 +119,20 @@ static void ZSTD_ldm_insertEntry(ldmState_t* ldmState,
*
* Gets the small hash, checksum, and tag from the rollingHash.
*
* If the tag matches (1 << ldmParams.hashEveryLog)-1, then
* If the tag matches (1 << ldmParams.hashRateLog)-1, then
* creates an ldmEntry from the offset, and inserts it into the hash table.
*
* hBits is the length of the small hash, which is the most significant hBits
* of rollingHash. The checksum is the next 32 most significant bits, followed
* by ldmParams.hashEveryLog bits that make up the tag. */
* by ldmParams.hashRateLog bits that make up the tag. */
static void ZSTD_ldm_makeEntryAndInsertByTag(ldmState_t* ldmState,
U64 const rollingHash,
U32 const hBits,
U32 const offset,
ldmParams_t const ldmParams)
{
U32 const tag = ZSTD_ldm_getTag(rollingHash, hBits, ldmParams.hashEveryLog);
U32 const tagMask = ((U32)1 << ldmParams.hashEveryLog) - 1;
U32 const tag = ZSTD_ldm_getTag(rollingHash, hBits, ldmParams.hashRateLog);
U32 const tagMask = ((U32)1 << ldmParams.hashRateLog) - 1;
if (tag == tagMask) {
U32 const hash = ZSTD_ldm_getSmallHash(rollingHash, hBits);
U32 const checksum = ZSTD_ldm_getChecksum(rollingHash, hBits);
@ -247,8 +247,8 @@ static size_t ZSTD_ldm_generateSequences_internal(
U64 const hashPower = ldmState->hashPower;
U32 const hBits = params->hashLog - params->bucketSizeLog;
U32 const ldmBucketSize = 1U << params->bucketSizeLog;
U32 const hashEveryLog = params->hashEveryLog;
U32 const ldmTagMask = (1U << params->hashEveryLog) - 1;
U32 const hashRateLog = params->hashRateLog;
U32 const ldmTagMask = (1U << params->hashRateLog) - 1;
/* Prefix and extDict parameters */
U32 const dictLimit = ldmState->window.dictLimit;
U32 const lowestIndex = extDict ? ldmState->window.lowLimit : dictLimit;
@ -283,7 +283,7 @@ static size_t ZSTD_ldm_generateSequences_internal(
lastHashed = ip;
/* Do not insert and do not look for a match */
if (ZSTD_ldm_getTag(rollingHash, hBits, hashEveryLog) != ldmTagMask) {
if (ZSTD_ldm_getTag(rollingHash, hBits, hashRateLog) != ldmTagMask) {
ip++;
continue;
}

2
lib/compress/zstd_ldm.h
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@ -87,7 +87,7 @@ size_t ZSTD_ldm_getTableSize(ldmParams_t params);
size_t ZSTD_ldm_getMaxNbSeq(ldmParams_t params, size_t maxChunkSize);
/** ZSTD_ldm_adjustParameters() :
* If the params->hashEveryLog is not set, set it to its default value based on
* If the params->hashRateLog is not set, set it to its default value based on
* windowLog and params->hashLog.
*
* Ensures that params->bucketSizeLog is <= params->hashLog (setting it to

2
lib/compress/zstdmt_compress.c
View File

@ -467,7 +467,7 @@ static int ZSTDMT_serialState_reset(serialState_t* serialState, ZSTDMT_seqPool*
DEBUGLOG(4, "LDM window size = %u KB", (1U << params.cParams.windowLog) >> 10);
ZSTD_ldm_adjustParameters(&params.ldmParams, &params.cParams);
assert(params.ldmParams.hashLog >= params.ldmParams.bucketSizeLog);
assert(params.ldmParams.hashEveryLog < 32);
assert(params.ldmParams.hashRateLog < 32);
serialState->ldmState.hashPower =
ZSTD_rollingHash_primePower(params.ldmParams.minMatchLength);
} else {

8
lib/zstd.h
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@ -555,12 +555,12 @@ typedef enum {
* Larger values improve collision resolution but decrease compression speed.
* The maximum value is ZSTD_LDM_BUCKETSIZELOG_MAX.
* Special: value 0 means "use default value" (default: 3). */
ZSTD_p_ldmHashEveryLog=164, /* Frequency of inserting/looking up entries into the LDM hash table.
ZSTD_p_ldmHashRateLog=164, /* Frequency of inserting/looking up entries into the LDM hash table.
* Must be clamped between 0 and (ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN).
* Default is MAX(0, (windowLog - ldmHashLog)), optimizing hash table usage.
* Larger values improve compression speed.
* Deviating far from default value will likely result in a compression ratio decrease.
* Special: value 0 means "automatically determine hashEveryLog". */
* Special: value 0 means "automatically determine hashRateLog". */
/* frame parameters */
ZSTD_p_contentSizeFlag=200, /* Content size will be written into frame header _whenever known_ (default:1)
@ -926,8 +926,8 @@ ZSTDLIB_API size_t ZSTD_decompress_generic(ZSTD_DCtx* dctx,
#define ZSTD_LDM_MINMATCH_MAX 4096
#define ZSTD_LDM_BUCKETSIZELOG_MIN 1
#define ZSTD_LDM_BUCKETSIZELOG_MAX 8
#define ZSTD_LDM_HASHEVERYLOG_MIN 0
#define ZSTD_LDM_HASHEVERYLOG_MAX (ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN)
#define ZSTD_LDM_HASHRATELOG_MIN 0
#define ZSTD_LDM_HASHRATELOG_MAX (ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN)
/* internal */
#define ZSTD_HASHLOG3_MAX 17

4
programs/benchzstd.c
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@ -133,7 +133,7 @@ BMK_advancedParams_t BMK_initAdvancedParams(void) {
0, /* ldmMinMatch */
0, /* ldmHashLog */
0, /* ldmBuckSizeLog */
0 /* ldmHashEveryLog */
0 /* ldmHashRateLog */
};
return res;
}
@ -171,7 +171,7 @@ static void BMK_initCCtx(ZSTD_CCtx* ctx,
ZSTD_CCtx_setParameter(ctx, ZSTD_p_ldmMinMatch, adv->ldmMinMatch);
ZSTD_CCtx_setParameter(ctx, ZSTD_p_ldmHashLog, adv->ldmHashLog);
ZSTD_CCtx_setParameter(ctx, ZSTD_p_ldmBucketSizeLog, adv->ldmBucketSizeLog);
ZSTD_CCtx_setParameter(ctx, ZSTD_p_ldmHashEveryLog, adv->ldmHashEveryLog);
ZSTD_CCtx_setParameter(ctx, ZSTD_p_ldmHashRateLog, adv->ldmHashRateLog);
ZSTD_CCtx_setParameter(ctx, ZSTD_p_windowLog, comprParams->windowLog);
ZSTD_CCtx_setParameter(ctx, ZSTD_p_hashLog, comprParams->hashLog);
ZSTD_CCtx_setParameter(ctx, ZSTD_p_chainLog, comprParams->chainLog);

2
programs/benchzstd.h
View File

@ -115,7 +115,7 @@ typedef struct {
unsigned ldmMinMatch; /* below: parameters for long distance matching, see zstd.1.md */
unsigned ldmHashLog;
unsigned ldmBucketSizeLog;
unsigned ldmHashEveryLog;
unsigned ldmHashRateLog;
} BMK_advancedParams_t;
/* returns default parameters used by nonAdvanced functions */

10
programs/fileio.c
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@ -346,9 +346,9 @@ void FIO_setLdmBucketSizeLog(unsigned ldmBucketSizeLog) {
g_ldmBucketSizeLog = ldmBucketSizeLog;
}
static U32 g_ldmHashEveryLog = FIO_LDM_PARAM_NOTSET;
void FIO_setLdmHashEveryLog(unsigned ldmHashEveryLog) {
g_ldmHashEveryLog = ldmHashEveryLog;
static U32 g_ldmHashRateLog = FIO_LDM_PARAM_NOTSET;
void FIO_setLdmHashRateLog(unsigned ldmHashRateLog) {
g_ldmHashRateLog = ldmHashRateLog;
}
@ -541,8 +541,8 @@ static cRess_t FIO_createCResources(const char* dictFileName, int cLevel,
if (g_ldmBucketSizeLog != FIO_LDM_PARAM_NOTSET) {
CHECK( ZSTD_CCtx_setParameter(ress.cctx, ZSTD_p_ldmBucketSizeLog, g_ldmBucketSizeLog) );
}
if (g_ldmHashEveryLog != FIO_LDM_PARAM_NOTSET) {
CHECK( ZSTD_CCtx_setParameter(ress.cctx, ZSTD_p_ldmHashEveryLog, g_ldmHashEveryLog) );
if (g_ldmHashRateLog != FIO_LDM_PARAM_NOTSET) {
CHECK( ZSTD_CCtx_setParameter(ress.cctx, ZSTD_p_ldmHashRateLog, g_ldmHashRateLog) );
}
/* compression parameters */
CHECK( ZSTD_CCtx_setParameter(ress.cctx, ZSTD_p_windowLog, comprParams.windowLog) );

2
programs/fileio.h
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@ -56,7 +56,7 @@ void FIO_setChecksumFlag(unsigned checksumFlag);
void FIO_setDictIDFlag(unsigned dictIDFlag);
void FIO_setLdmBucketSizeLog(unsigned ldmBucketSizeLog);
void FIO_setLdmFlag(unsigned ldmFlag);
void FIO_setLdmHashEveryLog(unsigned ldmHashEveryLog);
void FIO_setLdmHashRateLog(unsigned ldmHashRateLog);
void FIO_setLdmHashLog(unsigned ldmHashLog);
void FIO_setLdmMinMatch(unsigned ldmMinMatch);
void FIO_setMemLimit(unsigned memLimit);

2
programs/zstd.1
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@ -431,7 +431,7 @@ Larger bucket sizes improve collision resolution but decrease compression speed\
The minimum \fIlblog\fR is 0 and the maximum is 8 (default: 3)\.
.
.TP
\fBldmHashEveryLog\fR=\fIlhevery\fR, \fBlhevery\fR=\fIlhevery\fR
\fBldmHashRateLog\fR=\fIlhrlog\fR, \fBlhrlog\fR=\fIlhrlog\fR
Specify the frequency of inserting entries into the long distance matching hash table\.
.
.IP

2
programs/zstd.1.md
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@ -450,7 +450,7 @@ The list of available _options_:
The minimum _lblog_ is 0 and the maximum is 8 (default: 3).
- `ldmHashEveryLog`=_lhevery_, `lhevery`=_lhevery_:
- `ldmHashRateLog`=_lhrlog_, `lhrlog`=_lhrlog_:
Specify the frequency of inserting entries into the long distance matching
hash table.

10
programs/zstdcli.c
View File

@ -81,7 +81,7 @@ static const unsigned g_defaultMaxWindowLog = 27;
static U32 g_overlapLog = OVERLAP_LOG_DEFAULT;
static U32 g_ldmHashLog = 0;
static U32 g_ldmMinMatch = 0;
static U32 g_ldmHashEveryLog = LDM_PARAM_DEFAULT;
static U32 g_ldmHashRateLog = LDM_PARAM_DEFAULT;
static U32 g_ldmBucketSizeLog = LDM_PARAM_DEFAULT;
@ -410,7 +410,7 @@ static unsigned parseCompressionParameters(const char* stringPtr, ZSTD_compressi
if (longCommandWArg(&stringPtr, "ldmHashLog=") || longCommandWArg(&stringPtr, "lhlog=")) { g_ldmHashLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; }
if (longCommandWArg(&stringPtr, "ldmMinMatch=") || longCommandWArg(&stringPtr, "lmml=")) { g_ldmMinMatch = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; }
if (longCommandWArg(&stringPtr, "ldmBucketSizeLog=") || longCommandWArg(&stringPtr, "lblog=")) { g_ldmBucketSizeLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; }
if (longCommandWArg(&stringPtr, "ldmHashEveryLog=") || longCommandWArg(&stringPtr, "lhevery=")) { g_ldmHashEveryLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; }
if (longCommandWArg(&stringPtr, "ldmHashRateLog=") || longCommandWArg(&stringPtr, "lhrlog=")) { g_ldmHashRateLog = readU32FromChar(&stringPtr); if (stringPtr[0]==',') { stringPtr++; continue; } else break; }
DISPLAYLEVEL(4, "invalid compression parameter \n");
return 0;
}
@ -940,8 +940,8 @@ int main(int argCount, const char* argv[])
if (g_ldmBucketSizeLog != LDM_PARAM_DEFAULT) {
benchParams.ldmBucketSizeLog = g_ldmBucketSizeLog;
}
if (g_ldmHashEveryLog != LDM_PARAM_DEFAULT) {
benchParams.ldmHashEveryLog = g_ldmHashEveryLog;
if (g_ldmHashRateLog != LDM_PARAM_DEFAULT) {
benchParams.ldmHashRateLog = g_ldmHashRateLog;
}
if (cLevel > ZSTD_maxCLevel()) cLevel = ZSTD_maxCLevel();
@ -1051,7 +1051,7 @@ int main(int argCount, const char* argv[])
FIO_setLdmHashLog(g_ldmHashLog);
FIO_setLdmMinMatch(g_ldmMinMatch);
if (g_ldmBucketSizeLog != LDM_PARAM_DEFAULT) FIO_setLdmBucketSizeLog(g_ldmBucketSizeLog);
if (g_ldmHashEveryLog != LDM_PARAM_DEFAULT) FIO_setLdmHashEveryLog(g_ldmHashEveryLog);
if (g_ldmHashRateLog != LDM_PARAM_DEFAULT) FIO_setLdmHashRateLog(g_ldmHashRateLog);
FIO_setAdaptiveMode(adapt);
FIO_setAdaptMin(adaptMin);
FIO_setAdaptMax(adaptMax);

4
tests/fuzz/zstd_helpers.c
View File

@ -79,6 +79,6 @@ void FUZZ_setRandomParameters(ZSTD_CCtx *cctx, size_t srcSize, uint32_t *state)
ZSTD_LDM_MINMATCH_MAX, state);
setRand(cctx, ZSTD_p_ldmBucketSizeLog, 0, ZSTD_LDM_BUCKETSIZELOG_MAX,
state);
setRand(cctx, ZSTD_p_ldmHashEveryLog, 0,
ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN, state);
setRand(cctx, ZSTD_p_ldmHashRateLog, ZSTD_LDM_HASHRATELOG_MIN,
ZSTD_LDM_HASHRATELOG_MAX, state);
}

4
tests/playTests.sh
View File

@ -242,8 +242,8 @@ roundTripTest -g512K
roundTripTest -g512K " --zstd=mml=3,tlen=48,strat=6"
roundTripTest -g512K " --zstd=strat=6,wlog=23,clog=23,hlog=22,slog=6"
roundTripTest -g512K " --zstd=windowLog=23,chainLog=23,hashLog=22,searchLog=6,minMatch=3,targetLength=48,strategy=6"
roundTripTest -g512K " --single-thread --long --zstd=ldmHashLog=20,ldmMinMatch=64,ldmBucketSizeLog=1,ldmHashEveryLog=7"
roundTripTest -g512K " --single-thread --long --zstd=lhlog=20,lmml=64,lblog=1,lhevery=7"
roundTripTest -g512K " --single-thread --long --zstd=ldmHashLog=20,ldmMinMatch=64,ldmBucketSizeLog=1,ldmHashRateLog=7"
roundTripTest -g512K " --single-thread --long --zstd=lhlog=20,lmml=64,lblog=1,lhrlog=7"
roundTripTest -g512K 19

4
tests/zstreamtest.c
View File

@ -1878,8 +1878,8 @@ static int fuzzerTests_newAPI(U32 seed, U32 nbTests, unsigned startTest,
if (FUZ_rand(&lseed) & 1) CHECK_Z( setCCtxParameter(zc, cctxParams, ZSTD_p_enableLongDistanceMatching, FUZ_rand(&lseed) & 63, opaqueAPI) );
if (FUZ_rand(&lseed) & 3) CHECK_Z( setCCtxParameter(zc, cctxParams, ZSTD_p_ldmHashLog, FUZ_randomClampedLength(&lseed, ZSTD_HASHLOG_MIN, 23), opaqueAPI) );
if (FUZ_rand(&lseed) & 3) CHECK_Z( setCCtxParameter(zc, cctxParams, ZSTD_p_ldmMinMatch, FUZ_randomClampedLength(&lseed, ZSTD_LDM_MINMATCH_MIN, ZSTD_LDM_MINMATCH_MAX), opaqueAPI) );
if (FUZ_rand(&lseed) & 3) CHECK_Z( setCCtxParameter(zc, cctxParams, ZSTD_p_ldmBucketSizeLog, FUZ_randomClampedLength(&lseed, 0, ZSTD_LDM_BUCKETSIZELOG_MAX), opaqueAPI) );
if (FUZ_rand(&lseed) & 3) CHECK_Z( setCCtxParameter(zc, cctxParams, ZSTD_p_ldmHashEveryLog, FUZ_randomClampedLength(&lseed, 0, ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN), opaqueAPI) );
if (FUZ_rand(&lseed) & 3) CHECK_Z( setCCtxParameter(zc, cctxParams, ZSTD_p_ldmBucketSizeLog, FUZ_randomClampedLength(&lseed, ZSTD_LDM_BUCKETSIZELOG_MIN, ZSTD_LDM_BUCKETSIZELOG_MAX), opaqueAPI) );
if (FUZ_rand(&lseed) & 3) CHECK_Z( setCCtxParameter(zc, cctxParams, ZSTD_p_ldmHashRateLog, FUZ_randomClampedLength(&lseed, ZSTD_LDM_HASHRATELOG_MIN, ZSTD_LDM_HASHRATELOG_MAX), opaqueAPI) );
}
/* mess with frame parameters */