public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "shaohua.li at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/106892] New: Wrong code at -O3 on x86_64-linux-gnu Date: Thu, 08 Sep 2022 21:37:22 +0000 [thread overview] Message-ID: <bug-106892-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106892 Bug ID: 106892 Summary: Wrong code at -O3 on x86_64-linux-gnu Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: shaohua.li at inf dot ethz.ch Target Milestone: --- $ gcc-tk -v Using built-in specs. COLLECT_GCC=gcc-tk COLLECT_LTO_WRAPPER=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-75f59441cd63a1d07e86d70d59c518049f53904f/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../configure --disable-multilib --disable-bootstrap --enable-languages=c,c++ --prefix=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-75f59441cd63a1d07e86d70d59c518049f53904f Thread model: posix Supported LTO compression algorithms: zlib gcc version 13.0.0 20220830 (experimental) (GCC) $ $ gcc-tk -w -O0 simple.c && ./a.out 0 $ gcc-tk -w -O0 simple.c && ./a.out 3 $ $ cat simple.c a, b, c, d, e; f[8]; g() { while (a) a >>= 4; } h(i) { if (i >= '0') return i - '0'; } j(i) { b = 2; for (; g() <= 7; b++) if (i) { for (; e <= 7; e++) { c = 1; for (; c <= 7; c++) { d = h(b + 48); f[-d + 4] ^= 3; } } return; } } main() { j(1); printf("%d\n", f[2]); } $
next reply other threads:[~2022-09-08 21:37 UTC|newest] Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-09-08 21:37 shaohua.li at inf dot ethz.ch [this message] 2022-09-08 22:02 ` [Bug c/106892] " jakub at gcc dot gnu.org 2022-09-09 7:40 ` rguenth at gcc dot gnu.org 2022-09-09 7:53 ` shaohua.li at inf dot ethz.ch 2022-09-09 8:15 ` rguenth at gcc dot gnu.org 2022-09-09 8:20 ` marxin at gcc dot gnu.org 2022-09-09 8:20 ` jakub at gcc dot gnu.org 2022-09-09 8:31 ` [Bug c/106892] [11/12/13 Regression] Wrong code at -O3 on x86_64-linux-gnu since r11-963-g80d6f89e78fc3b77 rguenth at gcc dot gnu.org 2022-09-09 8:32 ` [Bug middle-end/106892] " rguenth at gcc dot gnu.org 2022-09-09 9:05 ` rguenth at gcc dot gnu.org 2022-09-09 9:31 ` rguenth at gcc dot gnu.org 2022-09-09 10:04 ` rguenth at gcc dot gnu.org 2022-09-09 12:43 ` rguenth at gcc dot gnu.org 2022-09-10 13:14 ` [Bug middle-end/106892] [11/12 " mikpelinux at gmail dot com 2022-09-12 7:53 ` marxin at gcc dot gnu.org 2022-10-11 12:06 ` cvs-commit at gcc dot gnu.org 2022-10-17 13:28 ` [Bug middle-end/106892] [11 " cvs-commit at gcc dot gnu.org 2022-10-17 13:29 ` 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-106892-4@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).