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- Subject: Re: Bitwise XOR in Lua?
- From: "Thatcher Ulrich" <tu@...>
- Date: Tue, 10 Sep 2002 11:00:42 -0400
On Sep 10, 2002 at 03:51 +0100, Reuben Thomas wrote:
> > One problem though: -A := not(A)+1 is for 2-complement.
> > Floating point numbers (normally) do not use 2-complement
> > arithmetic.
> ? It works for integers, and normally you just want to use the mantissa to
> store the bit-string, i.e. you're treating floats as ints.
Well, the actual raw bits in the mantissa aren't "correct", because
there's a separate sign bit while the mantissa is just magnitude. But
when you convert the double to an integer (i.e. in a wrapped C
function), it should come out right.