public inbox for java-prs@sourceware.org help / color / mirror / Atom feed
From: "tromey at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: java-prs@gcc.gnu.org Subject: [Bug java/21855] New: array bounds checking elimination Date: Wed, 01 Jun 2005 01:55:00 -0000 [thread overview] Message-ID: <20050601015434.21855.tromey@gcc.gnu.org> (raw) public class q { public static void main(String[] args) { for (int i = 0; i < args.length; ++i) System.out.println(args[i]); } } Right now you will get an unnecessary array bounds check at 'args[i]'. BTW we implement this check with an unsigned comparison to also weed out negative indices. Also, an array's size is fixed at its creation. We ought to be able to constant propagate in code like this: int[] array = new int[256]; for (int i = 0; i < array.length; ++i) { ... } ... but afaik there is no way for the front end of the value of 'array.length' -- Summary: array bounds checking elimination Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: java AssignedTo: dnovillo at redhat dot com ReportedBy: tromey at gcc dot gnu dot org CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21855
next reply other threads:[~2005-06-01 1:55 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2005-06-01 1:55 tromey at gcc dot gnu dot org [this message] 2005-06-01 20:31 ` [Bug tree-optimization/21855] " pinskia at gcc dot gnu dot org 2005-06-03 14:08 ` dnovillo at gcc dot gnu dot org 2005-06-03 14:34 ` dnovillo at gcc dot gnu dot org 2005-06-04 17:00 ` dnovillo at gcc dot gnu dot org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20050601015434.21855.tromey@gcc.gnu.org \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=java-prs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).