Re: Proof that DDD specifies non-halting behavior --- point by point

On 8/15/2024 3:19 AM, Mikko wrote:

On 2024-08-14 04:04:23 +0000, Richard Damon said:
 

On 8/13/24 11:48 PM, olcott wrote:

On 8/13/2024 10:21 PM, Richard Damon wrote:

On 8/13/24 10:38 PM, olcott wrote:

On 8/13/2024 9:29 PM, Richard Damon wrote:

On 8/13/24 8:52 PM, olcott wrote:

void DDD()
{
   HHH(DDD);
   return;
}
>
_DDD()
[00002172] 55         push ebp      ; housekeeping
[00002173] 8bec       mov ebp,esp   ; housekeeping
[00002175] 6872210000 push 00002172 ; push DDD
[0000217a] e853f4ffff call 000015d2 ; call HHH(DDD)
[0000217f] 83c404     add esp,+04
[00002182] 5d         pop ebp
[00002183] c3         ret
Size in bytes:(0018) [00002183]
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A simulation of N instructions of DDD by HHH according to
the semantics of the x86 language is necessarily correct.
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Nope, it is just the correct PARTIAL emulation of the first N instructions of DDD, and not of all of DDD,

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That is what I said dufuss.

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Nope. You didn't. I added clairifying words, pointing out why you claim is incorrect.
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For an emulation to be "correct" it must be complete, as partial emulations are only partially correct, so without the partial modifier, they are not correct.
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A complete emulation of one instruction is
a complete emulation of one instruction

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A correct simulation of N instructions of DDD by HHH is
sufficient to correctly predict the behavior of an unlimited
simulation.

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Nope, if a HHH returns to its caller,

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*Try to show exactly how DDD emulated by HHH returns to its caller*
(the first one doesn't even have a caller)
Use the above machine language instructions to show this.
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Remember how English works:
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When you ask "How DDD emulated by HHH returns to its callers".

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Show the exact machine code trace of how DDD emulated
by HHH (according to the semantics of the x86 language)
reaches its own machine address 00002183

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No. The trace is to long, and since you HHH doesn't meet your requirements (since it isn't a pure function) you can't give me a compldte input to trace.

 The trace is regular enough that we could define a formal language for
the trace and construct an analyzer program to detect deviations from
x86 semnatics and hidden inputs.
 

There are no deviations. The x86utm operating system is
built from libx86emu that has had decades of development
effort. HHH really does emulate itself emulating DDD.
*This source-code proves it*
https://github.com/plolcott/x86utm/blob/master/Halt7.c
Mike seems to have the best understanding of that source-code.
He might not yet understand that HHH does emulate itself
emulating DDD. He could find out how HHH does this.
HHH calls the x86utm operating system to create a new
process context to emulate DDD. HHH emulates itself in
the same process context. Its emulated self calls x86utm
to create another process context to emulate its own
DDD instance.
--
Copyright 2024 Olcott "Talent hits a target no one else can hit; Genius
hits a target no one else can see." Arthur Schopenhauer