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From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/102902] New: wrong code at -O3 on x86_64-linux-gnu (generated code hangs) Date: Fri, 22 Oct 2021 17:35:58 +0000 [thread overview] Message-ID: <bug-102902-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102902 Bug ID: 102902 Summary: wrong code at -O3 on x86_64-linux-gnu (generated code hangs) Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: zhendong.su at inf dot ethz.ch Target Milestone: --- This appears to be a recent regression. [575] % 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/12.0.0/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 12.0.0 20211022 (experimental) [master r12-4624-gae5c540662e] (GCC) [576] % [576] % gcctk -O2 small.c; ./a.out [577] % [577] % gcctk -O3 small.c [578] % timeout -s 9 10 ./a.out Killed [579] % [579] % cat small.c int printf (const char *, ...); int a, b, c, d, e, f; int main() { int g; short h = 1; for (; e < 2; e++) { L1: f = 1; while (b > 0 || a > 0) { g++; h++; printf("%d", g); } L2: if (!h && (!c || a)) goto L1; if (c) goto L2; } return 0; }
next reply other threads:[~2021-10-22 17:35 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-10-22 17:35 zhendong.su at inf dot ethz.ch [this message] 2021-10-22 18:53 ` [Bug tree-optimization/102902] [12 Regression] " pinskia at gcc dot gnu.org 2021-10-22 21:20 ` pinskia at gcc dot gnu.org 2021-10-25 8:44 ` [Bug tree-optimization/102902] [12 Regression] -O3 produces code that uses an uninitialized variable but originally was not used by r12-3876 marxin at gcc dot gnu.org 2021-10-25 8:45 ` marxin at gcc dot gnu.org 2021-10-25 8:57 ` marxin at gcc dot gnu.org 2021-10-25 8:58 ` rguenth at gcc dot gnu.org 2021-11-24 8:35 ` zhendong.su at inf dot ethz.ch 2021-11-24 8:44 ` pinskia at gcc dot gnu.org 2021-11-24 8:46 ` pinskia at gcc dot gnu.org 2022-01-17 13:09 ` rguenth at gcc dot gnu.org 2022-04-04 12:59 ` rguenth at gcc dot gnu.org
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