utils2.c (known_alignment): Deal specially with calls to malloc.

	* gcc-interface/utils2.c (known_alignment) <CALL_EXPR>: Deal specially
	with calls to malloc.

From-SVN: r237356

gcc/ada/ChangeLog

+2016-06-13  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gcc-interface/utils2.c (known_alignment) <CALL_EXPR>: Deal specially
+	with calls to malloc.
+
 2016-06-11  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gcc-interface/trans.c (build_binary_op_trapv): If no operand is a

gcc/ada/gcc-interface/utils2.c

@@ -171,6 +171,10 @@ known_alignment (tree exp)
 
     case CALL_EXPR:
       {
+	tree func = get_callee_fndecl (exp);
+	if (func && DECL_IS_MALLOC (func))
+	  return get_target_system_allocator_alignment () * BITS_PER_UNIT;
+
 	tree t = maybe_inline_call_in_expr (exp);
 	if (t)
 	  return known_alignment (t);