Re: [B2-devel] Thoughts on SheepShaver and Basilisk II

[Alexei S. <ale...@gm...>]

PPC_DECODE_CACHE is enabled by default in the current CVS TOT.

(The commit I linked too re-enabled it because that fork had disabled it at
some point. My comments were about the other change that moved a few lines
of code into a for loop.)

On Sat, Jun 16, 2012 at 3:54 PM, Robert Munafo <mr...@gm...> wrote:

> PPC_DECODE_CACHE enables a memory block decode_cache_p which holds up
> to 32768 consecutive results of decode(opcode) for a block of
> consecutive PPC instructions (32-bit words).
>
> There is a profiling function enabled by PPC_PROFILE_COMPILE_TIME
> which will record the amount of CPU time used by the decode cache
> function, printing "compile" vs "predecode" time vs total emulation
> time.
>
> I'm also prone to wonder why PPC_DECODE_CACHE was disabled by default
> -- it seems that if Gwenole went to all that effort implementing a
> decode cache (it's about 150 lines of code), why would it be disabled
> by default?
>
> On 6/16/12, Alexei Svitkine <ale...@gm...> wrote:
> > For example, let's take this commit by Tycho which kallisti5 pulled:
> >
>
> https://github.com/tycho/sheepshaver/commit/ceed8dca09fd5e5fe4e1bf9127d628382cb0f350
> >
> > Presumably this makes something faster. Maybe it does, it looks
> plausible -
> > [...]
>
> --
>  Robert Munafo  --  mrob.com
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