SHIFT_BYTE
largememory, (largewords << SHIFT_BYTE));
largememory, (largewords << SHIFT_BYTE));
memset(SmallSieve, 0, smallwords << SHIFT_BYTE);
#define SHIFT_WORD (SHIFT_BIT+SHIFT_BYTE)
#define SHIFT_MEGAWORD (SHIFT_MEGABYTE-SHIFT_BYTE)