From 7f36bb684659b026268d3f889fec2ed4c80e89dc Mon Sep 17 00:00:00 2001
From: Bartosz Taudul <wolf.pld@gmail.com>
Date: Fri, 13 Oct 2017 20:24:11 +0200
Subject: [PATCH] Mark unlikely code path.

It also changes MSVC behavior from generating two jumps to just one.
---
 client/concurrentqueue.h | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/client/concurrentqueue.h b/client/concurrentqueue.h
index 93d5abe2..bc19c492 100644
--- a/client/concurrentqueue.h
+++ b/client/concurrentqueue.h
@@ -1970,13 +1970,10 @@ private:
         tracy_force_inline T* enqueue_begin(index_t& currentTailIndex)
         {
             currentTailIndex = this->tailIndex.load(std::memory_order_relaxed);
-            if ((currentTailIndex & static_cast<index_t>(BLOCK_SIZE - 1)) != 0) {
-                return (*this->tailBlock)[currentTailIndex];
-            }
-            else {
+            if (details::unlikely((currentTailIndex & static_cast<index_t>(BLOCK_SIZE - 1)) == 0)) {
                 this->enqueue_begin_alloc<allocMode>(currentTailIndex);
-                return (*this->tailBlock)[currentTailIndex];
             }
+            return (*this->tailBlock)[currentTailIndex];
         }
 
         tracy_force_inline std::atomic<index_t>& get_tail_index()