re PR tree-optimization/52242 (libgomp.c/atomic-2.c failure on s390x)

PR tree-opt/52242
	Revert: 2011-11-26  Richard Henderson  <rth@redhat.com>
	* omp-low.c (expand_omp_atomic): Assume anything aligned to
	BIGGEST_ALIGNMENT is aligned.

From-SVN: r184955

gcc/ChangeLog

 2012-03-05  Richard Henderson  <rth@redhat.com>
 
+	PR tree-opt/52242
+	Revert: 2011-11-26  Richard Henderson  <rth@redhat.com>
+	* omp-low.c (expand_omp_atomic): Assume anything aligned to
+	BIGGEST_ALIGNMENT is aligned.
+
+2012-03-05  Richard Henderson  <rth@redhat.com>
+
 	* config/sh/sh.h (TARGET_ATOMIC_TEST_AND_SET_TRUEVAL): Move...
 	* config/sh/sh.c: ... here.
 

gcc/omp-low.c

@@ -5504,9 +5504,7 @@ expand_omp_atomic (struct omp_region *region)
       unsigned int align = TYPE_ALIGN_UNIT (type);
 
       /* __sync builtins require strict data alignment.  */
-      /* ??? Assume BIGGEST_ALIGNMENT *is* aligned.  */
-      if (exact_log2 (align) >= index
-	  || align * BITS_PER_UNIT >= BIGGEST_ALIGNMENT)
+      if (exact_log2 (align) >= index)
 	{
 	  /* Atomic load.  */
 	  if (loaded_val == stored_val