From: Magnus Hagander <magnus@hagander.net>
Date: Tue, 5 Jan 2010 11:06:28 +0000 (+0000)
Subject: Use _mm_pause() for win64 spin_delay(), per note from Tsutomu Yamada.
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=7746ca1365717a38453cbca02dbf3a7be1658e71;p=users%2Fandresfreund%2Fpostgres.git

Use _mm_pause() for win64 spin_delay(), per note from Tsutomu Yamada.
---

diff --git a/src/include/storage/s_lock.h b/src/include/storage/s_lock.h
index ac2ba6e96c..aede32dd16 100644
--- a/src/include/storage/s_lock.h
+++ b/src/include/storage/s_lock.h
@@ -837,13 +837,13 @@ typedef LONG slock_t;
 #define SPIN_DELAY() spin_delay()
 
 /* If using Visual C++ on Win64, inline assembly is unavailable.
- * Use a __nop instrinsic instead of rep nop.
+ * Use a _mm_pause instrinsic instead of rep nop.
  */
 #if defined(_WIN64)
 static __forceinline void
 spin_delay(void)
 {
-	__nop();
+	_mm_pause();
 }
 #else
 static __forceinline void