hex/math.fj¶
———- Addition / Subtraction:
Macros¶
hex¶
hex.add/2—dst += srchex.add/3—dst[:n] += src[:n]hex.add_shifted—dst[:dst_n] += src[:src_n] << (4*hex_shift)hex.add_constant—dst[:n] += consthex.sub/2—dst -= srchex.sub/3—dst[:n] -= src[:n]hex.sub_shifted—dst[:dst_n] -= src[:src_n] << (4*hex_shift)hex.sub_constant—dst[:dst_n] -= const
hex.add¶
hex.add.add_constant_with_leading_zeros— Internal helper forhex.add_constant: stripsconst’s trailing zero nibbles, then adds the result back intodst[:n]at the matching …hex.add.add_hex_shifted_constant/4— Wrapper around the 5-arityadd_hex_shifted_constant: derivesn_const = (#const + 3) / 4automatically so the caller doesn’t have to …hex.add.add_hex_shifted_constant/5—dst[:dst_n] += const << (4*hex_shift)hex.add.clear_carry/0—carry = 0hex.add.clear_carry/2—carry = 0. jump to c0 if it was 0, and to c1 otherwise.hex.add.not_carry—carry = !carryhex.add.set_carry—carry = 1hex.add.init— Its 9-bits are expected to be {carry<<8 |src<<4 | dst} at the jump to it (for the src,dst hexes, and the carry bit, of the …
hex.sub¶
hex.sub.sub_constant_with_leading_zeros— Internal helper forhex.sub_constant: stripsconst’s trailing zero nibbles, then subtracts the result fromdst[:n]at the matching …hex.sub.sub_hex_shifted_constant/4— Wrapper around the 5-aritysub_hex_shifted_constant: derivesn_const = (#const + 3) / 4automatically so the caller doesn’t have to …hex.sub.sub_hex_shifted_constant/5—dst[:dst_n] -= const << (4*hex_shift)hex.sub.clear_carry/0—carry = 0hex.sub.clear_carry/2—carry = 0. jump to c0 if it was 0, and to c1 otherwise.hex.sub.not_carry—carry = !carryhex.sub.set_carry—carry = 1hex.sub.init— Its 9-bits are expected to be {carry<<8 |src<<4 | dst} at the jump to it (for the src,dst hexes, and the carry bit, of the …