From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: from minnie.tuhs.org (minnie.tuhs.org [50.116.15.146]) by inbox.vuxu.org (Postfix) with ESMTP id 0B38121647 for ; Wed, 8 May 2024 20:29:44 +0200 (CEST) Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 0FBFB4333F; Thu, 9 May 2024 04:29:40 +1000 (AEST) Received: from mail-vs1-xe2d.google.com (mail-vs1-xe2d.google.com [IPv6:2607:f8b0:4864:20::e2d]) by minnie.tuhs.org (Postfix) with ESMTPS id 220B14333C for ; Thu, 9 May 2024 04:29:37 +1000 (AEST) Received: by mail-vs1-xe2d.google.com with SMTP id ada2fe7eead31-47f1100e05bso758856137.2 for ; Wed, 08 May 2024 11:29:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dartmouth.edu; s=google1; t=1715192976; x=1715797776; darn=tuhs.org; h=to:subject:message-id:date:from:mime-version:from:to:cc:subject :date:message-id:reply-to; bh=iPk0I1nR+oqTMHnUp+IJHNtEXFlq4Vp6mUHX51EgzjA=; b=u3Tp397PHiYODXJEAUwWpErHIa2DLLDPb2rgvWmUz0zGwi56FnMjXkATTNHA9v5IMA AaHF3wDj2Ma4G8f/snlN+SdysX4oKeHkx/jXQDG1m6J4ljknCOqbEbR7DD0t3tGBIIH/ FGgejLOZeSaU8oktdvKqfb6EJLctqGp/CRhTsolzc+sh7Gz2+1i590cv6CFBoXO37UyT IPpBNaEzCcB3JYJco5AG5vX7G6rEHHRcvNYnOGd+5Wt9vG2qpPu84Z+S9/MekfWXz8m8 nAX8f2oULXu/kScPl+GvhZUX1V0KlqeTFkcfBMyhDKspJrP9pKoomR/gvPwj8bA4c3Of cg/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715192976; x=1715797776; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=iPk0I1nR+oqTMHnUp+IJHNtEXFlq4Vp6mUHX51EgzjA=; b=t41wmgZMoblq4xmQjnuJHm0QJVpdOfx35oUuGRRemceFpsR/O+6j6gK53MPkKgWRFU pp3B73A3c07AYvX2P4SFvg//+Kes710GFRibvnpuTZDQTCDB9RnjIUbZOtViOZRKK/Cr VavgVsypQ/jheCaQ8qUClwrtSU+pJVfUn/FN/R0YlIf4puQ4xa37csmSYkg0Bv8BpFI1 FTjJogaFrv8VZbZ+RLwwYL1dzNu6AiGEgEgQ71qcBY+PHxh3VJ8pjWykVuMkD1RA4Ea4 VHYbaBcMjqvj2g33neGQWFlva9R8h+Tx5Hw0+IhTbw2s6Av++TDquJxTtVOu+7+2KVkD 1rkw== X-Gm-Message-State: AOJu0YwWCdLkkvI1hUMq7X/s9Hp8xSB/0+vkIxr58JnOUYv60mPXIynd wP4Un6AntTOU737sQMMqW1A9T5mWkXGvAb5x2DSrnAdBxe5JpKGBgHE60BWtNJXexwkLrRHDVG0 Pk6ShntB7X3Y/xPpZt1fABt0WoNhRh3+Q/k98RHxb9B2LIn6w X-Google-Smtp-Source: AGHT+IEuBg2zy7j3+2AjznRw8NLogog27CpWhOHrgatdMUQ0Oko+u1WYhaJHD33eofudExjCVAvT2rvEA1BTd1c3xGo= X-Received: by 2002:a67:fc8a:0:b0:47e:ef7a:2170 with SMTP id ada2fe7eead31-47f3c376c81mr3353548137.30.1715192975623; Wed, 08 May 2024 11:29:35 -0700 (PDT) MIME-Version: 1.0 From: Douglas McIlroy Date: Wed, 8 May 2024 14:29:19 -0400 Message-ID: To: TUHS main list Content-Type: multipart/alternative; boundary="00000000000008a3fa0617f57ccb" Message-ID-Hash: XHHOHV6NZYO4MYYWBX5DPNPRKM62AH5Z X-Message-ID-Hash: XHHOHV6NZYO4MYYWBX5DPNPRKM62AH5Z X-MailFrom: douglas.mcilroy@dartmouth.edu X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] Re: On the uniqueness of DMR's C compiler List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --00000000000008a3fa0617f57ccb Content-Type: text/plain; charset="UTF-8" There was nothing unique about the size or the object code of Dennis's C compiler. In the 1960s, Digitek had a thriving business of making Fortran compilers for all manner of machines. To optimize space usage, the compilers' internal memory model comprised variable-size movable tables, called "rolls". To exploit this non-native architecture, the compilers themselves were interpreted, although they generated native code. Bob McClure tells me he used one on an SDS910 that had 8K 16-bit words. Dennis was one-up on Digitek in having a self-maintaining compiler. Thus, when he implemented an optimization, the source would grow, but the compiler binary might even shrink thanks to self-application. Doug --00000000000008a3fa0617f57ccb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

There was nothing unique about the size or = the object code of Dennis's C compiler. In the 1960s, Digitek had a thr= iving business of making Fortran compilers for all manner of machines. To o= ptimize space usage, the compilers' internal memory model comprised=C2= =A0 variable-size movable tables, called "rolls". To exploit this= non-native architecture, the compilers themselves were interpreted, althou= gh they generated native code. Bob McClure tells me he used one on an SDS91= 0 that had 8K 16-bit words.

Dennis was one-up on Digitek= in having a self-maintaining compiler. Thus, when he implemented an optimi= zation, the source would grow, but the compiler binary might even shrink th= anks to self-application.

Doug

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