diff options
Diffstat (limited to 'gcc/ada/gcc-interface/utils.c')
| -rw-r--r-- | gcc/ada/gcc-interface/utils.c | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/gcc/ada/gcc-interface/utils.c b/gcc/ada/gcc-interface/utils.c index 0a6d6af5b52..6eed8e8b7a6 100644 --- a/gcc/ada/gcc-interface/utils.c +++ b/gcc/ada/gcc-interface/utils.c @@ -5230,20 +5230,26 @@ unchecked_convert (tree type, tree expr, bool notrunc_p) ? TYPE_RM_SIZE (etype) : TYPE_SIZE (etype)) == 0))) { - tree base_type - = gnat_type_for_size (TREE_INT_CST_LOW (TYPE_SIZE (type)), - type_unsigned_for_rm (type)); - tree shift_expr - = convert (base_type, - size_binop (MINUS_EXPR, - TYPE_SIZE (type), TYPE_RM_SIZE (type))); - expr - = convert (type, - build_binary_op (RSHIFT_EXPR, base_type, - build_binary_op (LSHIFT_EXPR, base_type, - convert (base_type, expr), - shift_expr), - shift_expr)); + if (integer_zerop (TYPE_RM_SIZE (type))) + expr = build_int_cst (type, 0); + else + { + tree base_type + = gnat_type_for_size (TREE_INT_CST_LOW (TYPE_SIZE (type)), + type_unsigned_for_rm (type)); + tree shift_expr + = convert (base_type, + size_binop (MINUS_EXPR, + TYPE_SIZE (type), TYPE_RM_SIZE (type))); + expr + = convert (type, + build_binary_op (RSHIFT_EXPR, base_type, + build_binary_op (LSHIFT_EXPR, base_type, + convert (base_type, + expr), + shift_expr), + shift_expr)); + } } /* An unchecked conversion should never raise Constraint_Error. The code |