[PATCH][SPARC] missing membar in niagara2_memcpy

[Jose E. Marchesi]

Hi.

The following patch prevents stores made before calling memcpy to
overlap with the block stores in niagara2_memcpy.

Tested on an Athena machine (sparc64x) running sparc64-*-linux-gnu.
No new warnings triggered by the patch.
No regressions detected.

PS: virtually the same code lives in the kernel in
    linux/arch/sparc/lib/NG2memcpy.S.  Probably that file shall be
    updated too...

2014-05-15  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* sysdeps/sparc/sparc64/multiarch/memcpy-niagara2.S: Add missing
	membar to avoid block loads/stores to overlap previous stores.

diff --git a/sysdeps/sparc/sparc64/multiarch/memcpy-niagara2.S b/sysdeps/sparc/sparc64/multiarch/memcpy-niagara2.S
index b43a9e3..a1a9642 100644
--- a/sysdeps/sparc/sparc64/multiarch/memcpy-niagara2.S
+++ b/sysdeps/sparc/sparc64/multiarch/memcpy-niagara2.S
@@ -211,6 +211,7 @@ ENTRY(__memcpy_niagara2)
 	 */
 	VISEntryHalf
 
+	membar		#Sync
 	alignaddr	%o1, %g0, %g0
 
 	add		%o1, (64 - 1), %o4