abs method
Calculates the absolute value, assuming that the number is a two's complement.
Implementation
LogicValue abs() {
if (width == 0) {
return this;
}
if (!this[-1].isValid) {
return LogicValue.filled(width, LogicValue.x);
}
return this[-1] == LogicValue.one
? ~this + LogicValue.ofInt(1, width)
: this;
}