diff options
Diffstat (limited to 'gcc-4.9/gcc/ada/gcc-interface/decl.c')
| -rw-r--r-- | gcc-4.9/gcc/ada/gcc-interface/decl.c | 37 |
1 files changed, 20 insertions, 17 deletions
diff --git a/gcc-4.9/gcc/ada/gcc-interface/decl.c b/gcc-4.9/gcc/ada/gcc-interface/decl.c index 52452ce..95bc778 100644 --- a/gcc-4.9/gcc/ada/gcc-interface/decl.c +++ b/gcc-4.9/gcc/ada/gcc-interface/decl.c @@ -2200,11 +2200,8 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition) tree gnu_max = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type)); tree gnu_this_max - = size_binop (MAX_EXPR, - size_binop (PLUS_EXPR, size_one_node, - size_binop (MINUS_EXPR, - gnu_max, gnu_min)), - size_zero_node); + = size_binop (PLUS_EXPR, size_one_node, + size_binop (MINUS_EXPR, gnu_max, gnu_min)); if (TREE_CODE (gnu_this_max) == INTEGER_CST && TREE_OVERFLOW (gnu_this_max)) @@ -2525,20 +2522,26 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition) gnu_max_size = NULL_TREE; else { - tree gnu_this_max - = size_binop (MAX_EXPR, - size_binop (PLUS_EXPR, size_one_node, - size_binop (MINUS_EXPR, + tree gnu_this_max; + + /* Use int_const_binop if the bounds are constant to + avoid any unwanted overflow. */ + if (TREE_CODE (gnu_base_min) == INTEGER_CST + && TREE_CODE (gnu_base_max) == INTEGER_CST) + gnu_this_max + = int_const_binop (PLUS_EXPR, size_one_node, + int_const_binop (MINUS_EXPR, gnu_base_max, - gnu_base_min)), - size_zero_node); - - if (TREE_CODE (gnu_this_max) == INTEGER_CST - && TREE_OVERFLOW (gnu_this_max)) - gnu_max_size = NULL_TREE; + gnu_base_min)); else - gnu_max_size - = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); + gnu_this_max + = size_binop (PLUS_EXPR, size_one_node, + size_binop (MINUS_EXPR, + gnu_base_max, + gnu_base_min)); + + gnu_max_size + = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); } } |