[backport from gcc-4.7/trunk <mikpe@it.uu.se>]

gcc/

2011-10-14  David Alan Gilbert  <david.gilbert@linaro.org>

	PR target/48126
	* config/arm/arm.c (arm_output_sync_loop): Move label before barrier.

--- gcc-4.6.1/gcc/config/arm/arm.c.~1~	2011-05-05 10:39:40.000000000 +0200
+++ gcc-4.6.1/gcc/config/arm/arm.c	2011-10-15 20:29:31.000000000 +0200
@@ -23392,8 +23392,11 @@ arm_output_sync_loop (emit_f emit,
 	}
     }
 
-  arm_process_output_memory_barrier (emit, NULL);
+  /* Note: label is before barrier so that in cmp failure case we still get
+     a barrier to stop subsequent loads floating upwards past the ldrex
+     PR target/48126.  */
   arm_output_asm_insn (emit, 1, operands, "%sLSYB%%=:", LOCAL_LABEL_PREFIX);
+  arm_process_output_memory_barrier (emit, NULL);
 }
 
 static rtx