[oc] Re: Merlin Hybrid System

[Andreas Bombe <bombe@informatik.tu-muenchen.de>]

On Fri, Dec 07, 2001 at 11:17:34AM -0600, Jim Dempsey wrote:
> You are starting to hit the nail on the head. JIT compilation is the
> core of the process.  Wherein the "source code" is the x86 binary
> code. JIT can derrive an understanding of the code by examination. It
> doesn't have to be told.

It "understands" what operations the code is performing, not what task
it is supposed to accomplish.

A JIT compiler and an optimizing assembler (your TECO-8) only need to
read the stream of operations and produce an equivalent stream of
operations in another language or which executing faster, respectively.

Turning a single thread of operation into multiple threads is creating
new operations that stilli (on a high level) do the same task.

> This is not unlike an experienced parallelizing programmer taking
> someone's code that they know nothing of and parallizing it. If a
> programmer can do it a program can do it.

Really?  Last time I checked we didn't have AIs yet.  If a program can
do it, why do companies still employ programmers?

> The simplest of the examples I can use for illustration is at the point of
> seperation
> of a single execuition stream into a multiple execution stream. Assume the
> instruction
> sequence
> 
>     bla
>     bla
>     bla
>     blink
>     bla
>     bla
>     bla
> 
> Assume at point blink an interrupt occures.
> 
>     bla
>     bla
>     bla
>     blink------------->
>             blankity
>             blankity
>             blank
>     <----------------
>     bla
>     bla
>     bla
> 
>  Depending on the circumstances of the interrupt one processing
> "strand" could continue execuition of the bla's during the interrupt.
> The process I've developed would permit this to occure to some
> degree.

So, what return address is saved in the exception frame created on the
stack?  What are the contents of the registers upon entry of the
interrupt handler?  What happens when a scheduler runs in the interrupt
and replaces the return address in the frame?

What happens to code that rightfully expects no user mode code running
while in interrupt mode?

-- 
Andreas Bombe <bombe@informatik.tu-muenchen.de>    DSA key 0x04880A44
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