hex/math.fj

———- Addition / Subtraction:

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Macros

hex

• hex.add/2 — both dst,src are hexes.

• hex.add/3 — dst[:n] += src[:n]

• hex.add_shifted — dst[:dst_n] += src[:src_n] << (4*hex_shift)

• hex.add_constant — const must be a positive constant.

• hex.sub/2 — both dst,src are hexes.

• hex.sub/3 — dst[:n] -= src[:n]

• hex.sub_shifted — dst[:dst_n] -= src[:src_n] << (4*hex_shift)

• hex.sub_constant — n_const is the hex-length of const, without all of it’s least-significant-hexes zeros.

hex.add

• hex.add.add_constant_with_leading_zeros

• hex.add.add_hex_shifted_constant/4

• hex.add.add_hex_shifted_constant/5 — const is a constant of size hex[:n_const]

• hex.add.clear_carry/0 — carry = 0

• hex.add.clear_carry/2 — carry = 0. jump to c0 if it was 0, and to c1 otherwise.

• hex.add.not_carry — carry = !carry

• hex.add.set_carry — carry = 1

• hex.add.init — This is where the add “truth” tables are.

hex.sub

• hex.sub.sub_constant_with_leading_zeros

• hex.sub.sub_hex_shifted_constant/4

• hex.sub.sub_hex_shifted_constant/5 — const is a constant of size hex[:n_const]

• hex.sub.clear_carry/0 — carry = 0

• hex.sub.clear_carry/2 — carry = 0. jump to c0 if it was 0, and to c1 otherwise.

• hex.sub.not_carry — carry = !carry

• hex.sub.set_carry — carry = 1

• hex.sub.init — This is where the sub “truth” tables are. must be called once if you want to use hex.sub (hex.init calls it).