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Add a function for LDM enable check

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This commit is contained in:
senhuang42 2020-10-20 13:46:02 -04:00
parent 578e889ec1
commit 8bdb32aebe
1 changed files with 10 additions and 2 deletions
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12
lib/compress/zstd_compress.c
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@ -202,6 +202,14 @@ size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs)
/* private API call, for dictBuilder only */
const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) { return &(ctx->seqStore); }
/* Returns 1 if compression parameters are such that we should
* enable long distance matching (wlog >= 27, strategy >= btopt).
* Returns 0 otherwise.
*/
static U32 ZSTD_CParams_shouldEnableLdm(const ZSTD_compressionParameters* const cParams) {
return cParams->strategy >= ZSTD_btopt && cParams->windowLog >= 27;
}
static ZSTD_CCtx_params ZSTD_makeCCtxParamsFromCParams(
ZSTD_compressionParameters cParams)
{
@ -210,7 +218,7 @@ static ZSTD_CCtx_params ZSTD_makeCCtxParamsFromCParams(
ZSTD_CCtxParams_init(&cctxParams, ZSTD_CLEVEL_DEFAULT);
cctxParams.cParams = cParams;
if (cParams.strategy >= ZSTD_btopt && cParams.windowLog >= 27 && cctxParams.nbWorkers == 0) {
if (ZSTD_CParams_shouldEnableLdm(&cParams)) {
DEBUGLOG(4, "ZSTD_makeCCtxParamsFromCParams(): Including LDM into cctx params");
cctxParams.ldmParams.enableLdm = 1;
/* LDM is enabled by default for optimal parser and window size >= 128MB */
@ -4188,7 +4196,7 @@ size_t ZSTD_compressStream2( ZSTD_CCtx* cctx,
dictSize, mode);
}
if (params.cParams.strategy >= ZSTD_btopt && params.cParams.windowLog >= 27) {
if (ZSTD_CParams_shouldEnableLdm(&params.cParams)) {
/* Enable LDM by default for optimal parser and window size >= 128MB */
DEBUGLOG(4, "LDM enabled by default (window size >= 128MB, strategy >= btopt)");
params.ldmParams.enableLdm = 1;