Re: [Sbcl-devel] Arithmetic on tagged integers

[Erik V. <eri...@gm...>]

Paul Khuong <pv...@pv...> wrote:
> You probably want a pair of (depending on the result's representation)
> multiply-shift VOPs.

That would solve the problem for the multiply and shift, but there's
some additional arithmetic in the signed version of the truncate
transform, where I subtract (ash x (- sb!vm:n-word-bits) from the
result, which also adds some unnecessary shifts.
I could write VOPs for this too, and there aren't any other
operations, but I thought it would be simpler to have just three VOPs
for conversion.