Re: what is the "VPU" (in igen/cgen/sim) ?

[Doug Evans <dje@google.com>]

On Tue, Jun 23, 2015 at 2:55 PM, Mike Frysinger <vapier@gentoo.org> wrote:
> the simulator had VPU tracing support proposed here:
>         https://sourceware.org/ml/gdb/2001-02/msg00267.html
>
> and committed here:
>         https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=01816cd804ec526927f53f0e408dae8c6ea269f2
>
> but nowhere can i seem to find a description of what the "VPU" actually is.
> the references to cgen doesn't lead anywhere as a grep of the cgen tree doesn't
> match anything.  the only user in the sim tree is msp430, and it uses it for
> generic cpu register tracing.  i would guess that it means "video processing
> unit" as Google would lead me to believe, but that doesn't make sense in the
> cgen/sim context.  same for "virtual processing unit".
>
> can anyone shed some light on this ?
> -mike

Hi.
I can't, except to say the term "vpu" doesn't exist in the cgen world.
I think Ben is your best here.