From 691bf28a5609bb2070c468069fbbd51390c009dd Mon Sep 17 00:00:00 2001
From: Vasil Dimov <vasil.dimov@oracle.com>
Date: Thu, 2 Dec 2010 10:36:45 +0200
Subject: [PATCH] Use "rep; nop" in InnoDB if it is available and "pause" is
 not

---
 storage/innobase/include/ut0ut.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/storage/innobase/include/ut0ut.h b/storage/innobase/include/ut0ut.h
index 5c7859a94f5..cd5c7ca99f1 100644
--- a/storage/innobase/include/ut0ut.h
+++ b/storage/innobase/include/ut0ut.h
@@ -61,6 +61,8 @@ typedef time_t	ib_time_t;
    Also asm volatile may trigger a memory barrier (spilling all registers
    to memory). */
 #  define UT_RELAX_CPU() __asm__ __volatile__ ("pause")
+#elif defined(HAVE_FAKE_PAUSE_INSTRUCTION)
+#  define UT_RELAX_CPU() __asm__ __volatile__ ("rep; nop")
 #elif defined(HAVE_ATOMIC_BUILTINS)
 #  define UT_RELAX_CPU() do { \
      volatile lint	volatile_var; \