hex.sub.clear_carry (arity 2)

carry = 0. jump to c0 if it was 0, and to c1 otherwise.

Signature

def clear_carry c0, c1 @ ret < ..tables.ret, .dst, ..tables.res { ... }

Defined in hex/math.fj — lines 227–235 (view on GitHub).

Complexity

• Time: 2@+5

• Space: 2@+20

See the complexity glossary for what @, w, dw, dbit, n mean.

Requires init

The following must be initialised before this macro is invoked:

• hex.sub.init (or hex.init)

Source

Click to view the macro body

def clear_carry c0, c1 @ ret < ..tables.ret, .dst, ..tables.res {
    wflip ..tables.ret+w, ret, .dst
  ret:
    wflip ..tables.ret+w, ret
    // carry is 0/f
    ..if0 ..tables.res, c0
    .not_carry
    wflip ..tables.res+w, 0xf*dw, c1
}

Depends on

• hex.if0/2

• hex.sub.not_carry

Used by

• hex.sub.clear_carry/0

• hex.sub_shifted

Example uses

• hex.sub_shifted in hex/math.fj

• hex.sub.clear_carry in hex/math.fj

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