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

mhagander · mhagander · commit ce92f8b4634b · 2010-01-05T11:06:28.000Z
diff --git a/src/include/storage/s_lock.h b/src/include/storage/s_lock.h
@@ -66,7 +66,7 @@
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- *	  $PostgreSQL: pgsql/src/include/storage/s_lock.h,v 1.170 2010/01/04 17:10:24 mha Exp $
+ *	  $PostgreSQL: pgsql/src/include/storage/s_lock.h,v 1.171 2010/01/05 11:06:28 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -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

Original file line number	Diff line number	Diff line change
`@@ -66,7 +66,7 @@`
`66`	`66`	`* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group`
`67`	`67`	`* Portions Copyright (c) 1994, Regents of the University of California`
`68`	`68`	`*`
`69`		`- * $PostgreSQL: pgsql/src/include/storage/s_lock.h,v 1.170 2010/01/04 17:10:24 mha Exp $`
	`69`	`+ * $PostgreSQL: pgsql/src/include/storage/s_lock.h,v 1.171 2010/01/05 11:06:28 mha Exp $`
`70`	`70`	`*`
`71`	`71`	`*-------------------------------------------------------------------------`
`72`	`72`	`*/`
`@@ -837,13 +837,13 @@ typedef LONG slock_t;`
`837`	`837`	`#define SPIN_DELAY() spin_delay()`
`838`	`838`
`839`	`839`	`/* If using Visual C++ on Win64, inline assembly is unavailable.`
`840`		`- * Use a __nop instrinsic instead of rep nop.`
	`840`	`+ * Use a _mm_pause instrinsic instead of rep nop.`
`841`	`841`	`*/`
`842`	`842`	`#if defined(_WIN64)`
`843`	`843`	`static __forceinline void`
`844`	`844`	`spin_delay(void)`
`845`	`845`	`{`
`846`		`- __nop();`
	`846`	`+ _mm_pause();`
`847`	`847`	`}`
`848`	`848`	`#else`
`849`	`849`	`static __forceinline void`