[Lightning] Re: Predicting generated code size

[Paolo Bonzini]

Sandro Magi wrote:
> On 9/28/07, Ludovic Courtès <address@hidden> wrote:
> > > Or perhaps, some technique to chain buffers together and auto-insert a
> > > jmp to the next buffer address when the current buffer is full?
> > That's another possibility.  It makes code generation faster, compared
> > to reallocating a new buffer and restarting from scratch, but it might
> > be cache-unfriendly.
>
> Hmm, I would expect branch prediction rate to be 100% since it's an
> unconditional jump, so it should only be a minor hit, if any.

Yes, this is probably the best thing to do.  You can expect more or less 
an instruction to take at most 20 bytes, I'd say, surely less than 32.

Paolo