From 96a798debb3cf487ec659540ee26d2127402afcf Mon Sep 17 00:00:00 2001
From: Thomas Waldmann <tw@waldmann-edv.de>
Date: Sun, 22 May 2016 01:22:52 +0200
Subject: [PATCH] chunker: add a comment about a potential speedup

---
 borg/_chunker.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/borg/_chunker.c b/borg/_chunker.c
index 2d1a03629..9ce5699f6 100644
--- a/borg/_chunker.c
+++ b/borg/_chunker.c
@@ -96,7 +96,7 @@ buzhash(const unsigned char *data, size_t len, const uint32_t *h)
 static uint32_t
 buzhash_update(uint32_t sum, unsigned char remove, unsigned char add, size_t len, const uint32_t *h)
 {
-    uint32_t lenmod = len & 0x1f;
+    uint32_t lenmod = len & 0x1f;  /* Note: replace by constant to get small speedup */
     return BARREL_SHIFT(sum, 1) ^ BARREL_SHIFT(h[remove], lenmod) ^ h[add];
 }