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From: olcott <polcott333@gmail.com>
Newsgroups: comp.lang.c,comp.lang.c++
Subject: Re: Can someone please verify the execution trace of this?
Date: Sun, 19 May 2024 21:43:06 -0500
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On 5/19/2024 8:52 PM, Bonita Montero wrote:
> Am 19.05.2024 um 21:00 schrieb olcott:
>> On 5/19/2024 1:08 PM, Bonita Montero wrote:
>>> Am 18.05.2024 um 23:40 schrieb olcott:
>>>> People are saying that they have no idea what this code does
>>>> because they do not believe it conforms to c11 or c17.
>>>>
>>>> typedef int (*ptr)();  // ptr is pointer to int function
>>>> 00 int H(ptr x, ptr y);
>>>> 01 int D(ptr x)
>>>> 02 {
>>>> 03   int Halt_Status = H(x, x);
>>>> 04   if (Halt_Status)
>>>> 05     HERE: goto HERE;
>>>> 06   return Halt_Status;
>>>> 07 }
>>>> 08
>>>> 09 int main()
>>>> 10 {
>>>> 11   H(D,D);
>>>> 12   return 0;
>>>> 13 }
>>>>
>>>> In the above case a simulator is an x86 emulator that correctly 
>>>> emulates
>>>> at least one of the x86 instructions of D in the order specified by the
>>>> x86 instructions of D.
>>>>
>>>> This may include correctly emulating the x86 instructions of H in the
>>>> order specified by the x86 instructions of H thus calling H(D,D) in
>>>> recursive simulation.
>>>>
>>>> *Execution Trace*
>>>> Line 11: main() invokes H(D,D);
>>>>
>>>> *keeps repeating* (unless aborted)
>>>> Line 01:
>>>> Line 02:
>>>> Line 03: simulated D(D) invokes simulated H(D,D) that simulates D(D)
>>>>
>>>> *Simulation invariant*
>>>> D correctly simulated by H cannot possibly reach past its own line 03.
>>>>
>>>> The key thing to note is that no D correctly simulated by any H of 
>>>> every
>>>> H/D pair specified by the above template ever reaches its own line 06
>>>> and halts.
>>>>
>>>
>>> Other people think 30s about this, you think years about that.
>>>
>>
>> It is the basis for my two decades long primary research into 
>> termination analysis. People on another forum have written
>> hundreds of posts claiming that D correctly simulated by H
>> reaches its own line 06 and halts.
>>
>> *I have only gotten truthful answers on this forum*
>>
> 
> That's not research, that's nonsense.
> 

This is not the forum to show that it is not nonsense this is
a simple C question that I should not even have to ask except
for a few people in another forum that consistently lie about
the answer.

I have been a professional C++ developer since Y2K. So I already
know the answer, I just need some competent people in this forum
to attest to this answer. I met Bjarne Stroustrup back when he
was going around the country promoting his new language.

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