public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug ipa/99862] New: [meta-issue] various missed optimizations for dead code elimination Date: Thu, 01 Apr 2021 07:59:32 +0000 [thread overview] Message-ID: <bug-99862-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99862 Bug ID: 99862 Summary: [meta-issue] various missed optimizations for dead code elimination Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: ipa Assignee: unassigned at gcc dot gnu.org Reporter: zhendong.su at inf dot ethz.ch CC: marxin at gcc dot gnu.org Target Milestone: --- [561] % gcctk -v Using built-in specs. COLLECT_GCC=gcctk COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/11.0.1/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++ --disable-werror --enable-multilib --with-system-zlib Thread model: posix Supported LTO compression algorithms: zlib gcc version 11.0.1 20210401 (experimental) [master revision e4bb1bd60a9:c23a685bf70:95d217ab52d31dc06fda42fc136dea165909e88b] (GCC) [562] % [562] % gcctk -O1 -S -o O1.s small.c [563] % gcctk -O3 -S -o O3.s small.c [564] % [564] % wc O1.s O3.s 23 45 420 O1.s 39 74 669 O3.s 62 119 1089 total [565] % [565] % grep foo O1.s [566] % grep foo O3.s call foo [567] % [567] % cat small.c extern void foo(void); static int a, b; static int c() { foo(); while (1) while (b) foo(); } void d() { if (a) c(); } int main() { d(); return 0; }
next reply other threads:[~2021-04-01 7:59 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-01 7:59 zhendong.su at inf dot ethz.ch [this message] 2021-04-01 8:01 ` [Bug ipa/99862] " zhendong.su at inf dot ethz.ch 2021-04-01 8:06 ` zhendong.su at inf dot ethz.ch 2021-04-02 0:28 ` egallager at gcc dot gnu.org 2021-04-02 17:02 ` zhendong.su at inf dot ethz.ch 2021-04-09 11:37 ` rguenth at gcc dot gnu.org 2021-04-09 11:39 ` rguenth at gcc dot gnu.org 2021-04-09 11:42 ` rguenth at gcc dot gnu.org 2021-04-09 11:53 ` rguenth at gcc dot gnu.org 2021-04-09 11:59 ` zhendong.su at inf dot ethz.ch 2021-04-10 10:12 ` egallager 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-99862-4@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).