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Path: ...!weretis.net!feeder9.news.weretis.net!news.quux.org!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: olcott <polcott333@gmail.com> Newsgroups: comp.theory Subject: Re: DDD correctly emulated by EEE --- Correct Emulation Defined Date: Sat, 22 Mar 2025 13:00:22 -0500 Organization: A noiseless patient Spider Lines: 36 Message-ID: <vrmtrn$cvat$7@dont-email.me> References: <vrfuob$256og$1@dont-email.me> <vrmirg$5bpl$1@dont-email.me> <ca0a3e4701bc62fa38f1138064feff7628ff5b48@i2pn2.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sat, 22 Mar 2025 19:00:23 +0100 (CET) Injection-Info: dont-email.me; posting-host="0ec9c516aeb6faf287a21f372f67aa5c"; logging-data="425309"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18aNh7z2YKEqpC+PqhShYVH" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:dJ+G1Lh6Eutvm86DtrGVJeYNrXE= In-Reply-To: <ca0a3e4701bc62fa38f1138064feff7628ff5b48@i2pn2.org> X-Antivirus-Status: Clean X-Antivirus: Norton (VPS 250322-4, 3/22/2025), Outbound message Content-Language: en-US Bytes: 2717 On 3/22/2025 12:34 PM, Richard Damon wrote: > On 3/22/25 10:52 AM, olcott wrote: >> _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 EEE(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 finite integer N instructions of the above x86 >> machine language DD are emulated by each x86 emulator >> EEE[N] at machine address [000015c3] according to the >> semantics of the x86 language no DD ever reaches its own >> "ret" instruction at machine address [00002155] and >> terminates normally. >> > > Your can't emulate the above code for N > 4, as you get into undefine > memory. > I have already addressed this objection dozens of times. -- Copyright 2025 Olcott "Talent hits a target no one else can hit; Genius hits a target no one else can see." Arthur Schopenhauer