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From: olcott <polcott333@gmail.com>
Newsgroups: comp.theory
Subject: Re: Liar detector: Fred, Richard, Joes and Alan --- Ben's agreement
Date: Wed, 10 Jul 2024 08:37:30 -0500
Organization: A noiseless patient Spider
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On 7/10/2024 2:18 AM, Mikko wrote:
> On 2024-07-09 14:14:16 +0000, olcott said:
> 
>> On 7/9/2024 1:14 AM, Mikko wrote:
>>> On 2024-07-08 17:36:58 +0000, olcott said:
>>>
>>>> On 7/8/2024 11:16 AM, Fred. Zwarts wrote:
>>>>> Op 08.jul.2024 om 18:07 schreef olcott:
>>>>>>
>>>>>> Try to show how infinity is one cycle too soon.
>>>>>>
>>>>> You believe that two equals infinity.
>>>>
>>>> void Infinite_Loop()
>>>> {
>>>>    HERE: goto HERE;
>>>> }
>>>>
>>>> void Infinite_Recursion()
>>>> {
>>>>    Infinite_Recursion();
>>>> }
>>>>
>>>> void DDD()
>>>> {
>>>>    HHH(DDD);
>>>> }
>>>>
>>>> Two cycles is enough to correctly determine that none
>>>> of the above functions correctly emulated by HHH can
>>>> possibly halt.
>>>>
>>>> That you don't see this is ignorance or deception.
>>>
>>> There is an important detail that determines whether an infinite
>>> execution can be inferred. That is best illustrated by the following
>>> examples:
>>>
>>> void Finite_Loop()
>>> {
>>>   int x = 10000;
>>> HERE:
>>>   if (x > 0) {
>>>     x--;
>>>     goto HERE;
>>>   }
>>> }
>>>
>>> void Finite_Recursion(int n)
>>> {
>>>   if (n > 0) {
>>>     Finite_Recursion(n + 1);
>>>   }
>>> }
>>>
>>> void DDD()
>>> {
>>>   HHH(DDD); // HHH detects recursive simulation and then simulates no 
>>> more
>>> }
>>>
>>> The important difference is that in my examples there is a conditional
>>> instruction that can (and does) prevent infinite exectuion.
>>>
>>
>> When we ask:
>> Does the call from DDD emulated by HHH to HHH(DDD) return?
> 
> Why would anyone ask that? A question should make clear its topic.
> Instead one could ask whether HHH can fully emulate DDD if that is
> what one wants to know. Or one may think that HHH and DDD are so
> unimteresting that there is no point to ask anyting about them.
> 

A correct emulator can correctly any correct x86 instructions.
When it emulates non-halting code then itself does not halt.

-- 
Copyright 2024 Olcott "Talent hits a target no one else can hit; Genius
hits a target no one else can see." Arthur Schopenhauer