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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/99101] optimization bug with -ffinite-loops Date: Wed, 24 Feb 2021 14:00:29 +0000 [thread overview] Message-ID: <bug-99101-4-TUG8Bl2Tze@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-99101-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99101 --- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> --- The following reduced testcase fails in the described way at -O2 with the C++ FE and with the C FE if you specify -ffinite-loops in addition to -O2. Already CDDCE1 does the problematic transform which means the first breakpoint hit on perform_tree_ssa_dce is the problematic one easing further investigation. volatile int xx; int main() { int read_finish_ = 1; int jobs_ = 1; int at_eof_ = 0; while (1) { int num_job = jobs_; for (int i = 0; i < jobs_; i++) { if (at_eof_) continue; if (read_finish_) { at_eof_ = 1; __builtin_printf ("1\n"); if (xx) __builtin_abort (); } } jobs_ -= num_job; } return 0; }
next prev parent reply other threads:[~2021-02-24 14:00 UTC|newest] Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-15 8:55 [Bug c++/99101] New: " 251078896 at qq dot com 2021-02-15 9:43 ` [Bug tree-optimization/99101] " rguenth at gcc dot gnu.org 2021-02-15 10:17 ` rguenth at gcc dot gnu.org 2021-02-15 10:25 ` 251078896 at qq dot com 2021-02-15 10:29 ` jakub at gcc dot gnu.org 2021-02-15 10:38 ` rguenth at gcc dot gnu.org 2021-02-15 10:46 ` rguenth at gcc dot gnu.org 2021-02-15 13:08 ` rguenth at gcc dot gnu.org 2021-02-24 14:00 ` rguenth at gcc dot gnu.org [this message] 2021-02-24 14:20 ` rguenth at gcc dot gnu.org 2021-02-24 14:41 ` rguenth at gcc dot gnu.org 2021-02-24 14:45 ` rguenth at gcc dot gnu.org 2021-02-24 15:09 ` rguenth at gcc dot gnu.org 2021-02-25 10:18 ` rguenth at gcc dot gnu.org 2021-02-25 11:34 ` rguenth at gcc dot gnu.org 2021-02-25 12:09 ` rguenth at gcc dot gnu.org 2021-02-25 12:40 ` rguenth at gcc dot gnu.org 2021-02-25 13:31 ` matz at gcc dot gnu.org 2021-02-25 18:29 ` matz at gcc dot gnu.org 2021-02-25 18:34 ` matz at gcc dot gnu.org 2021-02-26 9:38 ` rguenth at gcc dot gnu.org 2021-03-03 12:16 ` rguenth at gcc dot gnu.org 2021-03-03 14:00 ` matz at gcc dot gnu.org 2021-03-03 14:37 ` rguenth at gcc dot gnu.org 2021-03-03 19:52 ` hubicka at gcc dot gnu.org
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