Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: dbush Newsgroups: comp.theory Subject: Re: DD emulated by HHH cannot possibly terminate normally --- x86 code Date: Sat, 1 Mar 2025 19:24:50 -0500 Organization: A noiseless patient Spider Lines: 81 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sun, 02 Mar 2025 01:24:50 +0100 (CET) Injection-Info: dont-email.me; posting-host="172b7b2d68946293f9a01cd26ec2afb9"; logging-data="491735"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18Fii4iRb6JkeNbhytbcHF+" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:7ikbdFTBlmlxSlj94sB1FGiDbKg= Content-Language: en-US In-Reply-To: Bytes: 4169 On 3/1/2025 7:01 PM, olcott wrote: > On 3/1/2025 5:52 PM, dbush wrote: >> On 3/1/2025 6:47 PM, olcott wrote: >>> On 3/1/2025 2:22 AM, Mikko wrote: >>>> On 2025-03-01 00:47:58 +0000, olcott said: >>>> >>>>> _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] >>>>> >>>>> When we hypothesize that the code at machine address >>>>> 0000213c is an x86 emulator then we know that DD >>>>> remains stuck in recursive emulation and cannot possibly >>>>> reach its own "ret" instruction and terminate normally. >>>> >>>> The emulator itself is stuck and cannot return normally but it doesn't >>>> know it cannot return normally. At some point it runs out of memory >>>> and terminates normally or abnormally. >>>> >>> >>> Yes you are correct about this sub-step of two steps. >>> >>>>> When we add the additional complexity that HHH also >>>>> aborts this sequence at some point then every level >>>>> of recursive emulation immediately stops. This does >>>>> not enable any DD to ever reach its "ret" instruction. >>>> >>>> When we add an additional complexity we must note that there are other >>>> additional complexities that could be added instead. >>>> >>> >>> Sure we could carefully examine every detail about the price >>> of tea in China. >>> >>> When we are answering the question that seems impossible for >>> anyone here to pay attention to even when repeated hundreds of times: >>> >>> Can the above DD correctly emulated by HHH possibly >>> reach its own "ret" instruction and terminate normally? >>> >>> The answer is dead obviously "no" for everyone that is: >>> (a) Technically competent >>>    and >>> (b) Not deliberately deceptive. >> >> And by the same logic, no_numbers_greater_than_10 correctly emulated >> by F cannot reach its own "ret" instruction, leading to the conclusion >> that there are no natural numbers greater than 10, and you are on >> record as admitting this is correct. >> > > By this exact same reasoning the following function > > void dbush_is-a-stupid_fool() > { >   return; > } > > Proves that dbush is a stupid fool. > I'll let you respond to yourself: On 7/22/2024 10:51 AM, olcott wrote: > *Ad Hominem attacks are the first resort of clueless wonders*