hex.sub_constant

dst[:dst_n] -= const
n_const is the hex-length of const, without all of it’s least-significant-hexes zeros.

Signature

def sub_constant n, dst, const { ... }

Defined in hex/math.fj — lines 189–191 (view on GitHub).

Complexity

• Time: n_const(4@+12)   + 5@+11

• Space: n_const(2.5@+39) + (dst_n - hex_shift)(1.5@+13) + 4@+41

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 sub_constant n, dst, const {
    .sub.sub_constant_with_leading_zeros n, dst, const, (#(const&(0-const)))-1
}

Depends on

• hex.sub.sub_constant_with_leading_zeros

Used by

• hex.ptr_dec

• hex.ptr_sub

Example uses

• hex.ptr_dec in hex/pointers/pointer_arithmetics.fj

• hex.ptr_sub in hex/pointers/pointer_arithmetics.fj

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