public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "matz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/51275] CLOBBERS can be optimized if they are right before the return (or RESX) Date: Wed, 23 Nov 2011 14:36:00 -0000 [thread overview] Message-ID: <bug-51275-4-IkRMxeUMlr@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-51275-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51275 --- Comment #4 from Michael Matz <matz at gcc dot gnu.org> 2011-11-23 14:12:11 UTC --- Andrew: yes, I considered something similar. To work really well it requires some changes to the conflict generation code, though. Without the clobbers all objects stay live on the exit-block entry and therefore conflict (and hence won't be shared). Conflicts generated only because of the exit block need to be ignored. As Jakub says, the implementation should be improved by walking from the exit block upwards. fab seems like the wrong place to do this. Something like DSE feels more natural perhaps. But it's correct that the removal should happen after inlining but before eh optimizations.
next prev parent reply other threads:[~2011-11-23 14:12 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-11-23 0:27 [Bug tree-optimization/51275] New: " pinskia at gcc dot gnu.org 2011-11-23 1:18 ` [Bug tree-optimization/51275] " pinskia at gcc dot gnu.org 2011-11-23 2:25 ` pinskia at gcc dot gnu.org 2011-11-23 11:40 ` jakub at gcc dot gnu.org 2011-11-23 14:36 ` matz at gcc dot gnu.org [this message] 2011-11-29 23:05 ` pinskia at gcc dot gnu.org 2011-12-05 15:50 ` rguenth at gcc dot gnu.org 2011-12-05 16:03 ` matz at gcc dot gnu.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-51275-4-IkRMxeUMlr@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).