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sh.c (find_sole_member): New function. 

* sh.c (find_sole_member): New function.
	(sh_gimplify_va_arg_expr): Use it. Allow RECORD_TYPE mode mismatch
	if the record's alignment is larger than the size of its only member.

From-SVN: r103275
This commit is contained in:
Joern Rennecke 2005-08-19 13:25:58 +01:00
parent e27ce37987
commit 21bdb106e7
1 changed files with 32 additions and 10 deletions
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42
gcc/config/sh/sh.c
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@ -6632,6 +6632,27 @@ sh_va_start (tree valist, rtx nextarg)
expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
}
/* TYPE is a RECORD_TYPE. If there is only a single non-zero-sized
member, return it. */
static tree
find_sole_member (tree type)
{
tree field, member = NULL_TREE;
for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
{
if (TREE_CODE (field) != FIELD_DECL)
continue;
if (!DECL_SIZE (field))
return NULL_TREE;
if (integer_zerop (DECL_SIZE (field)))
continue;
if (member)
return NULL_TREE;
member = field;
}
return member;
}
/* Implement `va_arg'. */
static tree
@ -6657,6 +6678,7 @@ sh_gimplify_va_arg_expr (tree valist, tree type, tree *pre_p,
tree next_o, next_o_limit, next_fp, next_fp_limit, next_stack;
int pass_as_float;
tree lab_false;
tree member;
f_next_o = TYPE_FIELDS (va_list_type_node);
f_next_o_limit = TREE_CHAIN (f_next_o);
@ -6679,22 +6701,22 @@ sh_gimplify_va_arg_expr (tree valist, tree type, tree *pre_p,
like their member. This is relevant if the latter has a REAL_TYPE
or COMPLEX_TYPE type. */
while (TREE_CODE (type) == RECORD_TYPE
&& TYPE_FIELDS (type)
&& TREE_CODE (TYPE_FIELDS (type)) == FIELD_DECL
&& (TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == REAL_TYPE
|| TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == COMPLEX_TYPE
|| TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == RECORD_TYPE)
&& TREE_CHAIN (TYPE_FIELDS (type)) == NULL_TREE)
&& (member = find_sole_member (type))
&& (TREE_CODE (TREE_TYPE (member)) == REAL_TYPE
|| TREE_CODE (TREE_TYPE (member)) == COMPLEX_TYPE
|| TREE_CODE (TREE_TYPE (member)) == RECORD_TYPE))
{
tree field_type = TREE_TYPE (TYPE_FIELDS (type));
tree field_type = TREE_TYPE (member);
if (TYPE_MODE (type) == TYPE_MODE (field_type))
type = field_type;
else
{
gcc_assert (TYPE_ALIGN (type)
< GET_MODE_ALIGNMENT (TYPE_MODE (field_type)));
break;
gcc_assert ((TYPE_ALIGN (type)
< GET_MODE_ALIGNMENT (TYPE_MODE (field_type)))
|| (TYPE_ALIGN (type)
> GET_MODE_BITSIZE (TYPE_MODE (field_type))));
break;
}
}