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[SPARC] Tweak libgomp's cpu_relax

Message ID 201202292148.58072.ebotcazou@adacore.com
State New
Headers show

Commit Message

Eric Botcazou Feb. 29, 2012, 8:48 p.m. UTC 
As discussed with DaveM, this duplicates libitm's cpu_relax into libgomp.

Tested on SPARC64/Linux, applied on the mainline.


2012-02-29  Eric Botcazou  <ebotcazou@adacore.com>

	* config/linux/sparc/futex.h (cpu_relax): Read from CC register.

Comments

David Miller March 1, 2012, 8:56 p.m. UTC | #1 
From: Eric Botcazou <ebotcazou@adacore.com>
Date: Wed, 29 Feb 2012 21:48:57 +0100

> As discussed with DaveM, this duplicates libitm's cpu_relax into libgomp.
> 
> Tested on SPARC64/Linux, applied on the mainline.

Thanks for taking care of this Eric.
diff mbox

Patch

Index: config/linux/sparc/futex.h
===================================================================
--- config/linux/sparc/futex.h	(revision 184585)
+++ config/linux/sparc/futex.h	(working copy)
@@ -90,9 +90,5 @@  futex_wake (int *addr, int count)
 static inline void
 cpu_relax (void)
 {
-#if defined __arch64__ || defined  __sparc_v9__
-  __asm volatile ("membar #LoadLoad" : : : "memory");
-#else
-  __asm volatile ("" : : : "memory");
-#endif
+  __asm volatile ("rd %%ccr, %%g0" : : : "memory");
 }