Slightly improve entropy performance

Author: yoniko

lib/compress/zstd_lazy.c

@@ -891,6 +891,7 @@ FORCE_INLINE_TEMPLATE void ZSTD_row_update_internalImpl(ZSTD_matchState_t* ms,
     U32* const hashTable = ms->hashTable;
     U16* const tagTable = ms->tagTable;
     U32 const hashLog = ms->rowHashLog;
+    U32 hashSaltEntropyCollected = 0;
     const BYTE* const base = ms->window.base;
 
     DEBUGLOG(6, "ZSTD_row_update_internalImpl(): updateStartIdx=%u, updateEndIdx=%u", updateStartIdx, updateEndIdx);
@@ -906,8 +907,9 @@ FORCE_INLINE_TEMPLATE void ZSTD_row_update_internalImpl(ZSTD_matchState_t* ms,
         assert(hash == ZSTD_hashPtrSalted(base + updateStartIdx, hashLog + ZSTD_ROW_HASH_TAG_BITS, mls, ms->hashSalt));
         ((BYTE*)tagRow)[pos + ZSTD_ROW_HASH_TAG_OFFSET] = hash & ZSTD_ROW_HASH_TAG_MASK;
         row[pos] = updateStartIdx;
-        ms->hashSaltEntropy += hash;
+        hashSaltEntropyCollected = hash;
     }
+    ms->hashSaltEntropy += hashSaltEntropyCollected; /* collect salt entropy */
 }
 
 /* ZSTD_row_update_internal():