From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Philipp Stephani Newsgroups: gmane.emacs.bugs Subject: bug#26597: 25.1; Compilation error on master with --enable-check-lisp-object-type Date: Mon, 01 May 2017 14:33:28 +0000 Message-ID: References: <83mvb8riq0.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=94eb2c1cd99e24952f054e774f71 X-Trace: blaine.gmane.org 1493649254 18263 195.159.176.226 (1 May 2017 14:34:14 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 1 May 2017 14:34:14 +0000 (UTC) To: Stefan Monnier , 26597@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Mon May 01 16:34:10 2017 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1d5COw-0004g5-J6 for geb-bug-gnu-emacs@m.gmane.org; Mon, 01 May 2017 16:34:10 +0200 Original-Received: from localhost ([::1]:54585 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d5CP2-0005EV-6I for geb-bug-gnu-emacs@m.gmane.org; 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charset=UTF-8 Stefan Monnier schrieb am Mo., 1. Mai 2017 um 15:01 Uhr: > > Replacing a primitive value with a struct containing such a value > > should never degrade performance; that would be a compiler bug. > > FWIW, No, compilers do not guarantee that semantically-equivalent > programs will be compiled to code with equivalent performance, so it > wouldn't be a bug. It's only a "quality of implementation" issue. > Yes, I mean "bug" in a wider sense that includes QoI issues. --94eb2c1cd99e24952f054e774f71 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


Stefan= Monnier <monnier@iro.umontr= eal.ca> schrieb am Mo., 1. Mai 2017 um 15:01=C2=A0Uhr:
> Replacing a primitive value with a struct c= ontaining such a value
> should never degrade performance; that would be a compiler bug.

FWIW, No, compilers do not guarantee that semantically-equivalent
programs will be compiled to code with equivalent performance, so it
wouldn't be a bug.=C2=A0 It's only a "quality of implementatio= n" issue.

Yes, I mean "bug" in a wider sen= se that includes QoI issues.=C2=A0
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