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From: "Fred. Zwarts" <F.Zwarts@HetNet.nl>
Newsgroups: comp.theory
Subject: Re: DD correctly emulated by HHH --- Totally ignoring invalid
 rebuttals
Date: Tue, 4 Mar 2025 10:17:02 +0100
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Op 04.mrt.2025 om 04:50 schreef olcott:
> On 3/3/2025 9:33 PM, dbush wrote:
>> On 3/3/2025 10:07 PM, olcott wrote:
>>> int DD()
>>> {
>>>    int Halt_Status = HHH(DD);
>>>    if (Halt_Status)
>>>      HERE: goto HERE;
>>>    return Halt_Status;
>>> }
>>>
>>> _DD()
>>> [00002133] 55         push ebp      ; housekeeping
>>> [00002134] 8bec       mov ebp,esp   ; housekeeping
>>> [00002136] 51         push ecx      ; make space for local
>>> [00002137] 6833210000 push 00002133 ; push DD
>>> [0000213c] e882f4ffff call 000015c3 ; call HHH(DD)
>>> [00002141] 83c404     add esp,+04
>>> [00002144] 8945fc     mov [ebp-04],eax
>>> [00002147] 837dfc00   cmp dword [ebp-04],+00
>>> [0000214b] 7402       jz 0000214f
>>> [0000214d] ebfe       jmp 0000214d
>>> [0000214f] 8b45fc     mov eax,[ebp-04]
>>> [00002152] 8be5       mov esp,ebp
>>> [00002154] 5d         pop ebp
>>> [00002155] c3         ret
>>> Size in bytes:(0035) [00002155]
>>>
>>> DD correctly emulated by HHH cannot possibly
>>> reach its own "ret" instruction and terminate normally.
>>>
>>> The only valid rebuttal is to show all of the steps of
>>> exactly how DD correctly emulated by HHH reaches its
>>> own "ret" instruction.
>>>
>>
>> Suppose we accept that HHH is able to correctly determine that 
>> replacing the code of HHH with an unconditional simulator and running 
>> HHH(DD) will not halt.
>>
>> Then what?
> 
> That is not a valid rebuttal and your paraphrase of
> these words is inaccurate:
> 
> DD correctly emulated by HHH cannot possibly reach
> its own "ret" instruction and terminate normally.
Why are you repeating the failure of HHH to reach the 'ret' instruction? 
Fix HHH so that it does reach it. That can be done by not aborting the 
call to HHH, but replacing this call with the return value of HHH.