From: W. Felix Handte <w@felixhandte.com>
Date: Wed, 18 Aug 2021 19:21:43 +0000 (-0400)
Subject: Prefetch Input in Incompressible Sections (+0.25% Speed)
X-Git-Tag: v1.5.1~1^2~116^2~10
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=35932ab2f1e129dce0d19bfa82787dc4dc262eed;p=thirdparty%2Fzstd.git

Prefetch Input in Incompressible Sections (+0.25% Speed)
---

diff --git a/lib/compress/zstd_fast.c b/lib/compress/zstd_fast.c
index 411ffc118..f7df66681 100644
--- a/lib/compress/zstd_fast.c
+++ b/lib/compress/zstd_fast.c
@@ -337,6 +337,7 @@ _start: /* Requires: ip0 */
         /* advance to next positions */
         {
             if (ip1 >= nextStep) {
+                PREFETCH_L1(ip1 + 64);
                 step++;
                 nextStep += kStepIncr;
             }