https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83392
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- The difference is in: 486 HOST_WIDE_INT bitpos; 487 base = get_inner_reference (base, &bitsize, &pbitpos, &offset, &mode, 488 &unsignedp, &reversep, &volatilep); 489 if (offset == NULL_TREE 490 && DECL_P (base) 491 && pbitpos.is_constant (&bitpos)) On 64-bit, offset is non-NULL, sizetype 0x8000000000000001, and pbitpos is 0, on 32-bit offset is NULL and pbitpos is -17179869176 (i.e. signed HWI 0xfffffffc00000008). The difference is because pbitpos is poly_int16 and 8 * 0x8000000000000001 is not representable in signed HOST_WIDE_INT, while 8 * 0x80000001 is.
