> Ah, so in the BLKmode case, VALUE can still be a nonzero const_int?
Yes, I'd think so.
> What are the justification rules in that case? Naively, I'd have
> expected a store of (const_int 1) into a BLKmode field to set one
> of the bits to 1, but it sounds from the above like it depends on
> endianness: for little-endian targets it always sets a bit, but for
> big-endian targets it only sets a bit if the field width is a multiple
> of UNITS_PER_WORD.
For example, in Ada, the following program:
with Text_IO; use Text_IO;
with Unchecked_Conversion;
procedure P is
type Arr is new String(1..3);
function Conv is new Unchecked_Conversion (Integer, Arr);
type R is record
A : Arr;
end record;
My_R : R;
begin
My_R.A := Conv (16#41424344#);
Put (String(My_R.A));
end;
outputs DCB on little-endian and ABC on big-endian.
--
Eric Botcazou
