BigInt.toTwosComplement

private

void toTwosComplement(const(ulong)[]  mag,  bool  negative,
          size_t w,  ulong[]  ext)

static pure @safe

Converts a magnitude limb array into w-limb two's-complement form.

The magnitude is zero-extended to w limbs; for negative values the zero-extended magnitude is inverted and one is added, which yields all-ones sign-extension limbs. (Padding with ulong.max before inverting would turn the sign-extension limbs into zeros and corrupt the value.)

Parameters

`mag`	Magnitude limbs (little-endian).
`negative`	Whether the value is negative.
`w`	Window width in limbs; must be >= `mag.length`, and must include one extra limb when `negative` is set so the converted pattern never aliases a positive value.
`ext`	Output buffer of `w` limbs.