public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/112736] [14 Regression] vectorizer is introducing out of bounds memory access Date: Mon, 27 Nov 2023 22:44:15 +0000 [thread overview] Message-ID: <bug-112736-4-WUmR6Mjfb3@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-112736-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112736 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|vectorizer is introducing |[14 Regression] vectorizer |out of bounds memory access |is introducing out of | |bounds memory access Known to work| |13.1.0 Known to fail| |14.0 Last reconfirmed| |2023-11-27 Keywords| |needs-bisection, wrong-code Status|UNCONFIRMED |NEW Ever confirmed|0 |1 Target Milestone|--- |14.0 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- vect__14.12_2 = MEM <vector(4) int> [(int *)&b + -4B]; vect__14.14_16 = VEC_PERM_EXPR <vect__14.12_2, vect__14.12_2, { 3, 3, 3, 3 }>; This might be ok, unless before b is unaligned and what is before is unmapped. # vectp_b.10_23 = PHI <vectp_b.10_13(5), &MEM <int[3]> [(void *)&b + -4B](2)> vect__14.12_1 = MEM <vector(4) int> [(int *)vectp_b.10_23]; vect__14.13_10 = VEC_PERM_EXPR <vect__14.12_1, vect__14.12_1, { 3, 2, 1, 0 }>; vectp_b.10_11 = vectp_b.10_23 + 12; vect__14.14_12 = VEC_PERM_EXPR <vect__14.13_10, vect__14.13_10, { 0, 0, 0, 0 }>; Note GCC 13 was ok: _1 = b[2]; _2 = {_1, _1, _1, _1}; MEM <vector(4) int> [(int *)&c + 40B] = _2;
next prev parent reply other threads:[~2023-11-27 22:44 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-11-27 22:30 [Bug tree-optimization/112736] New: " kristerw at gcc dot gnu.org 2023-11-27 22:44 ` pinskia at gcc dot gnu.org [this message] 2023-11-28 12:10 ` [Bug tree-optimization/112736] [14 Regression] " rguenth at gcc dot gnu.org 2023-12-11 13:43 ` rguenth at gcc dot gnu.org 2023-12-12 14:26 ` cvs-commit at gcc dot gnu.org 2023-12-12 14:27 ` rguenth 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-112736-4-WUmR6Mjfb3@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).