From 92f18e66fdf34bdde3d5116ca3fac3910fe14fc5 Mon Sep 17 00:00:00 2001
From: Ilya Tokar <tokarip@google.com>
Date: Tue, 21 Mar 2023 13:05:25 -0700
Subject: [PATCH] Add prefetch to zippy compress

PiperOrigin-RevId: 518358512
---
 snappy-internal.h | 2 ++
 snappy.cc         | 6 ------
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/snappy-internal.h b/snappy-internal.h
index e442b0b..39fbda5 100644
--- a/snappy-internal.h
+++ b/snappy-internal.h
@@ -258,6 +258,8 @@ static inline std::pair<size_t, bool> FindMatchLength(const char* s1,
       s2 += 8;
     }
   }
+  SNAPPY_PREFETCH(s1 + 64);
+  SNAPPY_PREFETCH(s2 + 64);
 
   // Find out how long the match is. We loop over the data 64 bits at a
   // time until we find a 64-bit block that doesn't match; then we find
diff --git a/snappy.cc b/snappy.cc
index 9652b34..688065b 100644
--- a/snappy.cc
+++ b/snappy.cc
@@ -68,12 +68,6 @@
 #include <arm_acle.h>
 #endif
 
-#if defined(__GNUC__)
-#define SNAPPY_PREFETCH(ptr) __builtin_prefetch(ptr, 0, 3)
-#else
-#define SNAPPY_PREFETCH(ptr) (void)(ptr)
-#endif
-
 #include <algorithm>
 #include <array>
 #include <cstddef>