From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ihor Radchenko Newsgroups: gmane.emacs.devel Subject: Re: Add more supported primitives in libgccjit IR (was: Shrinking the C core) Date: Mon, 21 Aug 2023 11:41:53 +0000 Message-ID: <87jztofwqm.fsf@localhost> References: <20230809094655.793FC18A4654@snark.thyrsus.com> <83fs4dwwdo.fsf@gnu.org> <874jkt90a5.fsf@localhost> <87y1i57jqi.fsf@localhost> <87pm3h7h8k.fsf@localhost> <87h6ot7cf3.fsf@localhost> <87edjx7c0b.fsf@localhost> <831qfxw2cx.fsf@gnu.org> <87v8d95918.fsf@localhost> <87zg2lav4b.fsf@yahoo.com> <87sf8d57wf.fsf@localhost> <87r0nxatu1.fsf@yahoo.com> <87pm3h56ig.fsf@localhost> <87edjxarhz.fsf@yahoo.com> <87edjw4uw4.fsf@localhost> <77daee02cf1ba0db70c1@heytings.org> <87v8d8fzr9.fsf@localhost> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="15155"; mail-complaints-to="usenet@ciao.gmane.io" Cc: gregory@heytings.org, luangruo@yahoo.com, akrl@sdf.org, eliz@gnu.org, incal@dataswamp.org, emacs-devel@gnu.org To: "Alfred M. 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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:309063 Archived-At: "Alfred M. Szmidt" writes: > > Look at data.c:arith_driver. You'll see that it's essentially a function > > which dispatches the handling of its arguments depending on their type... > > > > These integer/float/bignum types are not known at compilation time ... > > This is not correct. If you have something like > (progn (setq x 1) (> x 2)), compiler is actually able to determine the > type of X at compilation time. > > It is absolutley correct, the Emacs compiler is not capable of doing > what you are suggesting. There are no specific functions for fixnum > comparison in Emacs Lisp, nor is the Emacs Lisp compiler capable of > being instructed to do such specific things. I've been repeating this > constantly now. That is needed to make programs faster in Lisp. I can see /* Define a substitute for Fadd1 Fsub1. Currently expose just fixnum arithmetic. */ static void define_add1_sub1 (void) in comp.c So, there is some type-specific optimization going on. It looks very limited though. -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at