ABS
ldiff[d][i] = ABS(lab[d][tr][tc][0]
#ifdef ABS
mp_size_t bignum_size = ((ABS (p.exponent) + BITS_PER_MP_LIMB - 1)
#define ABSIZ(x) ABS (SIZ (x))
dx=x2-x1; ax=ABS(dx)<<1; sx=SGN(dx);
dy=y2-y1; ay=ABS(dy)<<1; sy=SGN(dy);