RE: [PATCH] Output execution stats from ARM simulator

[Richard Earnshaw <rearnsha@gcc.gnu.org>]

On Mon, 2004-11-29 at 14:54, Jon Beniston wrote:
> > > 
> > > 2004-11-29  Jon Beniston  <jon@beniston.com>
> > > 
> > >         * wrapper.c (sim_info): Output number of instructions
> > >         executed and number of cycles taken to execute them.
> > 
> > While I don't see anything wrong with your patch, I'm not 
> > sure whether that information is accurately tracked any more. 
> >  So the numbers probably aren't meaningful, especially for 
> > any core other than an ARM7 (and I don't mean an ARM7TDMI either).
> 
> I can understand cycles not being valid (as this surely is core specific),
> but I take it the number of instructions executed should be?
> 
> Cheers,
> Jon

A quick look at the source suggests the instruction count is probably OK
in a free-running simulation, but I would want to do more testing for
use with gdb and single-stepping before I could be certain about that
case.

The cycle counts are probably not modelled at all for some of the newly
added instructions, and the S/N/I counts are pretty meaningless on
Harvard-Architecture cores.

R.