_MULx2
_MULx2(c, R_01(r)); \
_MULx2(c, R_23(r)); \
_MULx2(c, R_01(r)); \
_MULx2(c, R_23(r)); \
_MULx2(c, R_01(r)); \
_MULx2(c, R_01(r)); \