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(finish_struct): Promote unsigned bitfield to signed int 

if the field isn't as wide as an int.

From-SVN: r4178
This commit is contained in:
Richard Stallman 1993-04-18 03:35:35 +00:00
parent 1815bfc25f
commit 06038f1264
1 changed files with 16 additions and 12 deletions
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28
gcc/c-decl.c
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@ -5260,19 +5260,23 @@ finish_struct (t, fieldlist)
/* Promote each bit-field's type to int if it is narrower than that. */
for (x = fieldlist; x; x = TREE_CHAIN (x))
if (DECL_BIT_FIELD (x)
&& C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x)))
{
tree type = TREE_TYPE (x);
&& (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x))
|| DECL_FIELD_SIZE (x) < TYPE_PRECISION (integer_type_node)))
{
tree type = TREE_TYPE (x);
/* Preserve unsignedness if traditional or if not really any wider. */
if (TREE_UNSIGNED (type)
&& (flag_traditional
|| (TYPE_PRECISION (type)
== TYPE_PRECISION (integer_type_node))))
TREE_TYPE (x) = unsigned_type_node;
else
TREE_TYPE (x) = integer_type_node;
}
/* Preserve unsignedness if traditional
or if not really getting any wider. */
if (TREE_UNSIGNED (type)
&& (flag_traditional
||
(TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
&&
DECL_FIELD_SIZE (x) == TYPE_PRECISION (integer_type_node))))
TREE_TYPE (x) = unsigned_type_node;
else
TREE_TYPE (x) = integer_type_node;
}
/* If this structure or union completes the type of any previous
variable declaration, lay it out and output its rtl. */