Implement bit-wise complement operator ~

[Bernd Böckmann]

VASM has it. I consider this to be different to the logical not ! operator. ! returns 0 or 1 depending on its argument. ~ toggles the bits. It is also not redundant to x ^ $FFFF IF only the bitsare toggled according to the type. So 1 becomes $FE and not $FFFE. One may write x ^ $FF, but then one has to remember the type.

Operator priority should be higher than that of the logical operators.

[Bernd Böckmann]

Bit-wise complement operator ~ has precedence one below primary, so in

~A & ~b, ~A and ~B are evaluated first.

[Bernd Böckmann]

! has also high priority one below primary, so the following:

.if !A || B

Is evaluated as (!A) || B. The following two lines are equivalent:

.ifn A || B
.if !(A || B)

That gives reason for .ifn to spare some braces, and ! intuitively does the right thing.