public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "amacleod at redhat dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/110582] [14 Regression] Wrong code at -O2/3 on x86_64-linux-gnu Date: Mon, 31 Jul 2023 16:11:38 +0000 [thread overview] Message-ID: <bug-110582-4-DdAOlNvDWN@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-110582-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110582 Andrew Macleod <amacleod at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED --- Comment #7 from Andrew Macleod <amacleod at redhat dot com> --- There was a bug in the implementation of fur_list where it was using the supplied values for *any* encountered operand, not just ssa_names. so when the phi analyzer was trying to find an initial value fro the PHI a_lsm.2_29 it was miscalculating the value of iftmp.1_15 and thought it had an (incorrect) limited range of [-2,2]. # a_lsm.12_29 = PHI <iftmp.1_11(4)> iftmp.1_15 = 3 / a_lsm.12_29; it then though it could fold away the condition. The patch adjusts the operand fetcher to work properly, and then the phi analyzer calcualtes the range for the statement properly, and we can no longer remove the condtion.
prev parent reply other threads:[~2023-07-31 16:11 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-07-07 8:03 [Bug c/110582] New: " shaohua.li at inf dot ethz.ch 2023-07-07 8:40 ` [Bug tree-optimization/110582] [14 Regression] " pinskia at gcc dot gnu.org 2023-07-07 11:19 ` rguenth at gcc dot gnu.org 2023-07-08 1:08 ` pinskia at gcc dot gnu.org 2023-07-08 1:17 ` pinskia at gcc dot gnu.org 2023-07-30 14:46 ` shaohua.li at inf dot ethz.ch 2023-07-31 16:06 ` cvs-commit at gcc dot gnu.org 2023-07-31 16:11 ` amacleod at redhat dot com [this message]
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-110582-4-DdAOlNvDWN@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).