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small Cspeed increase

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This commit is contained in:
Yann Collet
2015-11-06 15:40:14 +01:00
parent acd222c82e
commit fc2afcfa64
1 changed files with 10 additions and 2 deletions
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lib/zstdhc.c
+10 -2
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@@ -647,7 +647,11 @@ size_t ZSTD_HC_compressBlock_lazy_generic(ZSTD_HC_CCtx* ctx,
offset_2 = offset_1; offset_2 = offset_1;
matchLength = searchMax(ctx, ip, iend, &offset, maxSearches, mls); matchLength = searchMax(ctx, ip, iend, &offset, maxSearches, mls);
if (!matchLength) { ip++; continue; } if (!matchLength)
{
ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */
continue;
}
/* let's try to find a better solution */ /* let's try to find a better solution */
start = ip; start = ip;
@@ -793,7 +797,11 @@ size_t ZSTD_HC_compressBlock_greedy(ZSTD_HC_CCtx* ctx, void* dst, size_t maxDstS
{ {
size_t offset=999999; size_t offset=999999;
size_t matchLength = ZSTD_HC_HcFindBestMatch_selectMLS(ctx, ip, iend, &offset, maxSearches, mls); size_t matchLength = ZSTD_HC_HcFindBestMatch_selectMLS(ctx, ip, iend, &offset, maxSearches, mls);
if (!matchLength) { ip++; continue; } if (!matchLength)
{
ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */
continue;
}
while ((ip>anchor) && (ip-offset>ctx->base) && (ip[-1] == ip[-1-offset])) { ip--; } /* catch up */ while ((ip>anchor) && (ip-offset>ctx->base) && (ip[-1] == ip[-1-offset])) { ip--; } /* catch up */
/* store sequence */ /* store sequence */
{ {