From: W. Felix Handte <w@felixhandte.com>
Date: Thu, 13 Aug 2020 18:54:10 +0000 (-0400)
Subject: Move Prefetch Before Insertion; Speed Up ~6%
X-Git-Tag: v1.4.7~81^2~20
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a494111385bd7d61dbf8f4e3d817e51d2ba6a81c;p=thirdparty%2Fzstd.git

Move Prefetch Before Insertion; Speed Up ~6%
---

diff --git a/lib/compress/zstd_lazy.c b/lib/compress/zstd_lazy.c
index 45b248472..0ee9f6506 100644
--- a/lib/compress/zstd_lazy.c
+++ b/lib/compress/zstd_lazy.c
@@ -531,14 +531,14 @@ size_t ZSTD_HcFindBestMatch_generic (
 
     U32 matchIndex;
 
-    /* HC4 match finder */
-    matchIndex = ZSTD_insertAndFindFirstIndex_internal(ms, cParams, ip, mls);
-
     if (dictMode == ZSTD_dedicatedDictSearch) {
         const U32* entry = &dms->hashTable[ddsIdx];
         PREFETCH_L1(entry);
     }
 
+    /* HC4 match finder */
+    matchIndex = ZSTD_insertAndFindFirstIndex_internal(ms, cParams, ip, mls);
+
     for ( ; (matchIndex>lowLimit) & (nbAttempts>0) ; nbAttempts--) {
         size_t currentMl=0;
         if ((dictMode != ZSTD_extDict) || matchIndex >= dictLimit) {