From 8779583bdb8b6d0e48a50533df7bccf8b9a39a9c Mon Sep 17 00:00:00 2001
From: Gregory Hainaut <gregory.hainaut@gmail.com>
Date: Thu, 5 Jan 2017 08:40:23 +0100
Subject: [PATCH] boost ring queue: use % to wrap the index

For power of 2, it is replaced with a single and instruction. If it potentially faster
than branch. But it worths a benchmark
---
 plugins/GSdx/boost_spsc_queue.hpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/plugins/GSdx/boost_spsc_queue.hpp b/plugins/GSdx/boost_spsc_queue.hpp
index cd595e95d9..eb8158598c 100644
--- a/plugins/GSdx/boost_spsc_queue.hpp
+++ b/plugins/GSdx/boost_spsc_queue.hpp
@@ -91,11 +91,12 @@ public:
     {
         size_t ret = arg + 1;
 #if 0
+        // Initial boost code
         while (unlikely(ret >= max_size))
-#else
-        while (ret >= max_size)
-#endif
             ret -= max_size;
+#else
+        ret %= max_size;
+#endif
         return ret;
     }