re PR target/49244 (__sync or __atomic builtins will not emit 'lock bts/btr/btc')

	PR target/49244
	* gimple.c (gimple_builtin_call_types_compatible_p): Allow
	char/short arguments promoted to int because of promote_prototypes.

From-SVN: r235792

gcc/ChangeLog

+2016-05-02  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/49244
+	* gimple.c (gimple_builtin_call_types_compatible_p): Allow
+	char/short arguments promoted to int because of promote_prototypes.
+
 2016-05-02  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/predicates.md (register_ssemem_operand): New predicate.

gcc/gimple.c

@@ -2486,7 +2486,16 @@ gimple_builtin_call_types_compatible_p (const gimple *stmt, tree fndecl)
       if (!targs)
 	return true;
       tree arg = gimple_call_arg (stmt, i);
-      if (!useless_type_conversion_p (TREE_VALUE (targs), TREE_TYPE (arg)))
+      tree type = TREE_VALUE (targs);
+      if (!useless_type_conversion_p (type, TREE_TYPE (arg))
+	  /* char/short integral arguments are promoted to int
+	     by several frontends if targetm.calls.promote_prototypes
+	     is true.  Allow such promotion too.  */
+	  && !(INTEGRAL_TYPE_P (type)
+	       && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)
+	       && targetm.calls.promote_prototypes (TREE_TYPE (fndecl))
+	       && useless_type_conversion_p (integer_type_node,
+					     TREE_TYPE (arg))))
 	return false;
       targs = TREE_CHAIN (targs);
     }