public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug ipa/100994] [12 Regression] wrong code with "-O1 -finline-small-functions -fipa-cp" Date: Wed, 09 Jun 2021 18:31:05 +0000 [thread overview] Message-ID: <bug-100994-4-q68msrOrfr@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-100994-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100994 --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- The difference after IPA between r12-433 and r12-434 is: --- pr100994.c.092t.fixup_cfg3_ 2021-06-09 14:26:08.000000000 -0400 +++ pr100994.c.092t.fixup_cfg3 2021-06-09 14:26:28.000000000 -0400 @@ -3,7 +3,6 @@ int main () { - const struct a l; const <unnamed-unsigned:9> l$c; int g.0_4; int f.3_5; @@ -14,8 +13,7 @@ int main () int e.5_10; <bb 2> [local count: 1073741824]: - l = d; - l$c_3 = l.c; + l$c_3 = 0; <bb 3> [local count: 9761289362]: g.0_4 = g; @@ -37,8 +35,8 @@ int main () goto <bb 6>; [50.00%] <bb 6> [local count: 4343773769]: - l.c = l$c_3; - _6 = BIT_FIELD_REF <l, 8, 0>; + d.c = l$c_3; + _6 = 0; _7 = _6 & 15; if (_7 != 0) goto <bb 8>; [50.00%] Note, d is a TREE_STATIC const variable where both members are 0, so I guess l$c_3 = 0; is ok, but the l.c = l$c_3 to d.c = l$c_3; change is not, that is what segfaults there.
next prev parent reply other threads:[~2021-06-09 18:31 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-06-09 14:29 [Bug ipa/100994] New: " suochenyao at 163 dot com 2021-06-09 18:24 ` [Bug ipa/100994] [12 Regression] " jakub at gcc dot gnu.org 2021-06-09 18:31 ` jakub at gcc dot gnu.org [this message] 2021-06-09 18:39 ` jakub at gcc dot gnu.org 2021-06-09 19:02 ` jakub at gcc dot gnu.org 2021-06-09 19:07 ` jakub at gcc dot gnu.org 2021-06-09 19:41 ` msebor at gcc dot gnu.org 2021-06-09 21:28 ` ebotcazou at gcc dot gnu.org 2021-06-09 21:30 ` ebotcazou at gcc dot gnu.org 2021-06-09 21:32 ` pinskia 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-100994-4-q68msrOrfr@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).