a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
is unsigned and narrower than uintmax_t. */
#define PROPAGATE_ALL_ONES(x) \
- ((sizeof (x) < sizeof (uintmax_t) \
+ ((sizeof (x) != sizeof (uintmax_t) \
&& (~ (x) == (sizeof (x) < sizeof (int) \
? - (1 << (sizeof (x) * CHAR_BIT)) \
: 0))) \
- ? UINTMAX_MAX : (x))
+ ? UINTMAX_MAX : (uintmax_t) (x))
/* Extract the top bit of X as an uintmax_t value. */
#define EXTRACT_TOP_BIT(x) ((x) \