#if N_BITS == 1
{
-#ifdef WORDS_BIGENDIAN
-# define SCREEN_SHIFT_LEFT(x,n) ((x) << (n))
-# define SCREEN_SHIFT_RIGHT(x,n) ((x) >> (n))
-#else
-# define SCREEN_SHIFT_LEFT(x,n) ((x) >> (n))
-# define SCREEN_SHIFT_RIGHT(x,n) ((x) << (n))
-#endif
-
#define LEFT_MASK(x) \
(((x) & 0x1f) ? \
SCREEN_SHIFT_RIGHT (0xffffffff, (x) & 0x1f) : 0)