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[2003:e0:b72d:bc00:686f:49e6:1b8c:6739]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434d526b14csm179354155e9.2.2024.12.08.19.09.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Dec 2024 19:09:41 -0800 (PST) In-Reply-To: <86ttbdewpr.fsf@gnu.org> (Eli Zaretskii's message of "Sun, 08 Dec 2024 22:38:56 +0200") Received-SPF: pass client-ip=2a00:1450:4864:20::332; envelope-from=gerd.moellmann@gmail.com; helo=mail-wm1-x332.google.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, FREEMAIL_REPLY=1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:326226 Archived-At: Eli Zaretskii writes: >> From: Gerd M=C3=B6llmann >> Cc: Pip Cet , luangruo@yahoo.com, >> ali_gnu2@emvision.com, emacs-devel@gnu.org >> Date: Sun, 08 Dec 2024 20:15:09 +0100 >>=20 >> Eli Zaretskii writes: >>=20 >> >> It'd be a good investment of effort today, in exchange for making the= GC >> >> code significantly easier to understand and maintain in the future. It >> >> would certainly not be without its benefits, so calling it a "waste of >> >> effort" is unfair. >> > >> > I disagree. We've lived with this GC code for a long time, and I >> > don't see any complications due to !USE_LSB. And if we are going to >> > switch to igc at some point, investment in GC is even less sensible. >> > >> > I don't see what's unfair in making my position clear. >>=20 >> I think Pip meant igc. > > Then it's all a huge misunderstanding, and I apologize fore not > guessing that it was about igc. In my defense I can only say that igc > was never mentioned. Or I'm wrong, and Pip meant something else. >> That would be a lot simpler without the 32-bit >> stuff, wide ints or not. I said already what I think about that before. > > If you want to drop the 32-bit stuff, then (a) you will need to find > someone else to regularly build and test the Windows port of the > branch, and (b) we will need to agree on emacs-devel right now that > 32-bit builds of Emacs will be dropped when igc lands. I would recommend that, indeed, but I don't expect it to happen any time soon :-). >> >> > No, there's also a built-in assumption in MPS about the size of a >> >> > word. >> >>=20 >> >> That's very vague. If there is an assumption that EMACS_INT =3D=3D >> >> mps_word_t, it would certainly not be built into MPS, which doesn't k= now >> >> about EMACS_INT at all. >> > >> > Not EMACS_INT, Lisp_Object. At least that's what Gerd explained to me >> > back when I asked about WIDE_EMACS_INT in the MPS build. Maybe he can >> > chime in and clarify this. >>=20 >> (Not sure I understand the context in which you are discussing.) >>=20 >> As far as igc goes, a Lisp_Object consisting of 2 mps_word_t poses a >> problem because we scan one mps_word_t at a time. Depending on where the >> tag bits are, we need the other mps_word_t belonging to a Lisp_Object to >> be able to determine its type (Lisp_Int0/1Lisp_Symbol, ...). IIRC >> this is currently the case, and it's a major PITA.=20 > > That's what I remembered from when you explained that a few months > ago. What about dropping, officially sanctioned so to speak, WIDE_EMACS_INT support for igc? That would help.