diff options
Diffstat (limited to 'gcc/ada/gcc-interface/decl.c')
| -rw-r--r-- | gcc/ada/gcc-interface/decl.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/gcc/ada/gcc-interface/decl.c b/gcc/ada/gcc-interface/decl.c index b51200f..6b6bc07 100644 --- a/gcc/ada/gcc-interface/decl.c +++ b/gcc/ada/gcc-interface/decl.c @@ -1814,7 +1814,12 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, bool definition) /* First subtypes of Character are treated as Character; otherwise this should be an unsigned type if the base type is unsigned or if the lower bound is constant and non-negative or if the type - is biased. */ + is biased. However, even if the lower bound is constant and + non-negative, we use a signed type for a subtype with the same + size as its signed base type, because this eliminates useless + conversions to it and gives more leeway to the optimizer; but + this means that we will need to explicitly test for this case + when we change the representation based on the RM size. */ if (kind == E_Enumeration_Subtype && No (First_Literal (Etype (gnat_entity))) && Esize (gnat_entity) == RM_Size (gnat_entity) @@ -1822,7 +1827,8 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, bool definition) && flag_signed_char) gnu_type = make_signed_type (CHAR_TYPE_SIZE); else if (Is_Unsigned_Type (Etype (gnat_entity)) - || Is_Unsigned_Type (gnat_entity) + || (Esize (Etype (gnat_entity)) != Esize (gnat_entity) + && Is_Unsigned_Type (gnat_entity)) || Has_Biased_Representation (gnat_entity)) gnu_type = make_unsigned_type (esize); else |