public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/106868] [12/13 Regression] Bogus -Wdangling-pointer warning with -O1 Date: Wed, 07 Sep 2022 09:05:39 +0000 [thread overview] Message-ID: <bug-106868-4-cFyvncCD8R@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-106868-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106868 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Keywords| |diagnostic Summary|Bogus -Wdangling-pointer |[12/13 Regression] Bogus |warning with -O1 |-Wdangling-pointer warning | |with -O1 Component|c |tree-optimization Last reconfirmed| |2022-09-07 Status|UNCONFIRMED |NEW Priority|P3 |P2 CC| |msebor at gcc dot gnu.org Target Milestone|--- |12.3 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Confirmed. <bb 2> [local count: 1073741824]: alloc (&q); q.0_1 = q; *p_4(D) = q.0_1; q ={v} {CLOBBER(eol)}; a_8 = __builtin_memcpy (q.0_1, "", 1); *a_8 = 0; return; (gdb) p debug_gimple_stmt (use_stmt) # .MEM_9 = VDEF <.MEM_7> *a_8 = 0; (gdb) p debug_gimple_stmt (stmt) # .MEM_6 = VDEF <.MEM_5> q ={v} {CLOBBER(eol)}; we somehow confuse q.0_1 = q; as assigning the address of the object 'q'. Some addr vs deref mismatch somewhere in the code. A regression with -Wall.
next prev parent reply other threads:[~2022-09-07 9:05 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-09-07 8:47 [Bug c/106868] New: " medhefgo at web dot de 2022-09-07 9:05 ` rguenth at gcc dot gnu.org [this message] 2022-09-12 16:18 ` [Bug tree-optimization/106868] [12/13 Regression] " msebor at gcc dot gnu.org 2022-09-12 17:04 ` msebor at gcc dot gnu.org 2022-12-05 9:41 ` rguenth at gcc dot gnu.org 2022-12-05 13:56 ` cvs-commit at gcc dot gnu.org 2022-12-05 14:06 ` rguenth at gcc dot gnu.org 2022-12-12 11:20 ` [Bug tree-optimization/106868] [12 " cvs-commit at gcc dot gnu.org 2022-12-12 11:20 ` 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-106868-4-cFyvncCD8R@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).