ipa-pure-const.c (check_stmt): Clobbers do not make a function non-const/pure.

2012-01-27  Richard Guenther  <rguenther@suse.de>

	* ipa-pure-const.c (check_stmt): Clobbers do not make a
	function non-const/pure.

From-SVN: r183632

gcc/ChangeLog

 2012-01-27  Richard Guenther  <rguenther@suse.de>
 
+	* ipa-pure-const.c (check_stmt): Clobbers do not make a
+	function non-const/pure.
+
+2012-01-27  Richard Guenther  <rguenther@suse.de>
+
 	PR tree-optimization/50444
 	* tree-sra.c (build_ref_for_offset): Properly adjust the
 	MEM_REF type for unaligned accesses.

gcc/ipa-pure-const.c

@@ -652,7 +652,8 @@ check_stmt (gimple_stmt_iterator *gsip, funct_state local, bool ipa)
       print_gimple_stmt (dump_file, stmt, 0, 0);
     }
 
-  if (gimple_has_volatile_ops (stmt))
+  if (gimple_has_volatile_ops (stmt)
+      && !gimple_clobber_p (stmt))
     {
       local->pure_const_state = IPA_NEITHER;
       if (dump_file)