public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "evancheng at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/24418] New: Redudant compare to zero not eliminated Date: Tue, 18 Oct 2005 00:01:00 -0000 [thread overview] Message-ID: <bug-24418-11457@http.gcc.gnu.org/bugzilla/> (raw) Compile the attached code with -O3. It produces an redundent cmpl following a subl: subl 28(%ebp), %eax cmpl $0, %eax je L12 jg L10 Looks like it's missing a insn pattern so combine would combine subl + cmpl. See http://gcc.gnu.org/ml/gcc/2005-10/msg00347.html -- Summary: Redudant compare to zero not eliminated Product: gcc Version: 4.0.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: evancheng at gcc dot gnu dot org GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24418
next reply other threads:[~2005-10-18 0:01 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2005-10-18 0:01 evancheng at gcc dot gnu dot org [this message] 2005-10-18 0:02 ` [Bug rtl-optimization/24418] " evancheng at gcc dot gnu dot org 2005-10-18 0:07 ` pinskia at gcc dot gnu dot org 2005-10-18 0:10 ` pinskia at gcc dot gnu dot org 2005-10-25 22:55 ` [Bug target/24418] " evancheng 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=bug-24418-11457@http.gcc.gnu.org/bugzilla/ \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@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).