From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Newsgroups: gmane.emacs.bugs Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations? 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Tue, 7 Jul 2020 15:54:58 +0000 In-Reply-To: <926674413.6042347.1594070583586@mail.yahoo.com> X-Mailer: Apple Mail (2.3445.104.14) X-CTCH-RefID: str=0001.0A782F16.5F049AD6.002E, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 X-CTCH-VOD: Unknown X-CTCH-Spam: Unknown X-CTCH-Score: 0.000 X-CTCH-Flags: 0 X-CTCH-ScoreCust: 0.000 X-CSC: 0 X-CHA: v=2.3 cv=BZ+mLYl2 c=1 sm=1 tr=0 a=SF+I6pRkHZhrawxbOkkvaA==:117 a=SF+I6pRkHZhrawxbOkkvaA==:17 a=kj9zAlcOel0A:10 a=M51BFTxLslgA:10 a=ER-AJWomcl0xNCVepSAA:9 a=CjuIK1q_8ugA:10 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:182804 Archived-At: 6 juli 2020 kl. 23.23 skrev Andrea Corallo : > Yes I am happy :) Not sure about the floating point discussion > originated from this but on my side this bug can be closed. Then closed it is. I would happily write something in NEWS but -- as Eli = noted -- for any noticeable change in behaviour to occur, many = conditions need to be met, several of which are quite unlikely. More improvements to the constant-folding are possible and desirable. = For example, I have a patch that deals with constant expressions in = let-bindings, so that (let ((x (+ 1 2))) (f x)) simplifies to (f 3), with the variable x removed. This in turn generates = more opportunities for further simplification and dead-code elimination. = Tell me if you are interested.