Re: [Qemu-devel] Re: Compile files only once: some planning

[Paul Brook]

> On 03/24/2010 12:19 PM, Richard Henderson wrote:
> > On 03/24/2010 02:47 AM, Paolo Bonzini wrote:
> >> 1) make CPUState define only common fields. Include CPUState at the
> >> beginning of each per-target CPUXYZState.
> >
> > Irritatingly, the common fields contain quite big TLBs. And the
> > offsets from the start of env affect the compactness of the code
> > generated from TCG. We really really want the general registers
> > to come first to make sure that those offsets fit the host's
> > reg+offset addressing mode.
> 
> What about adding a 512-bytes (or more) block or something like that at
> the beginning of CPUState with a union, so you can put the per-target
> stuff there?

Is it really worth the hassle? Anything touching CPUState is probably going to 
be CPU specific anyway.

Paul