From e3be7b11592994139a9649d5750654ddfb4e7059 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 17 Mar 2013 16:37:06 +0100
Subject: [PATCH] avutil/get_pool: Remove redundant initial atomic operation

602->442 dezicycles

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavutil/buffer.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavutil/buffer.c b/libavutil/buffer.c
index d268a7f604..3475e57b4a 100644
--- a/libavutil/buffer.c
+++ b/libavutil/buffer.c
@@ -239,14 +239,14 @@ void av_buffer_pool_uninit(AVBufferPool **ppool)
 /* remove the whole buffer list from the pool and return it */
 static BufferPoolEntry *get_pool(AVBufferPool *pool)
 {
-    BufferPoolEntry *cur = NULL, *last = NULL;
+    BufferPoolEntry *cur = *(void * volatile *)&pool->pool, *last = NULL;
 
-    do {
+    while (cur != last) {
         FFSWAP(BufferPoolEntry*, cur, last);
         cur = avpriv_atomic_ptr_cas((void * volatile *)&pool->pool, last, NULL);
         if (!cur)
             return NULL;
-    } while (cur != last);
+    }
 
     return cur;
 }