> It's correct to always sign-extend the offset to the pointer mode > width (or simply truncate it, if the offset width is larger than > pointer mode width).
I'd argue against that if you're dereferencing a large structure pointer. P->foo would always be an unsigned offset. Similarly for arrays, although one could argue either way with that. In the m32c case, though, the offset is a signed type, but an unsigned extension was used. The mismatch is the problem. Either way, there's going to be a compromise.
