On Wed, Apr 9, 2008 at 10:40 PM, DJ Delorie <[EMAIL PROTECTED]> wrote: > > I tracked it down to this: > > > /* Allow conversions between integral types and pointers only if > there is no sign or zero extension involved. */ > if (((POINTER_TYPE_P (type) && INTEGRAL_TYPE_P (TREE_TYPE (op))) > || (POINTER_TYPE_P (TREE_TYPE (op)) && INTEGRAL_TYPE_P (type))) > && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (op))) > return false; > > The code does not do what the comment says. It also requires that > there be no truncation. > > However, of course, other parts of the compiler complain about > truncation as well. > > The root cause is this: > > ptr = fold_build2 (POINTER_PLUS_EXPR, TREE_TYPE (ptr), ptr, > fold_convert (sizetype, vtable)); > > We fold_convert to sizetype, without regard for whether it's the same > precision as TREE_TYPE (ptr). vtable is the right size, ptr is the > right size, but we're creating an intermediate that's the wrong size. > > Can we put in a calculate-unsigned-for-type call here? That should be > sizetype for everyone else, but the special type for m32c.
This particular case indeed needs fixing (I assume vtable is a pointer). There is build_nonstandard_integer_type for this. Richard.
