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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/115347] New: wrong code at -O3 on x86_64-linux-gnu Date: Tue, 04 Jun 2024 19:13:21 +0000 [thread overview] Message-ID: <bug-115347-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115347 Bug ID: 115347 Summary: wrong code at -O3 on x86_64-linux-gnu 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: --- It appears to be a regression from 11.*, affecting 12.* and later. Compiler Explorer: https://godbolt.org/z/PY985hnff [510] % 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/15.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk --enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib Thread model: posix Supported LTO compression algorithms: zlib gcc version 15.0.0 20240604 (experimental) (GCC) [511] % [511] % gcctk -O2 small.c; ./a.out [512] % gcctk -O3 small.c [513] % ./a.out Aborted [514] % cat small.c struct a { int b; int c; } d, e[2]; int f, g, h; int main() { for (; f < 1; f++) { for (h = 0; h < 2; h++) { d = e[f]; g = e[1].c; e[f].c = 1; } } if (d.c != 1) __builtin_abort(); return 0; }
next reply other threads:[~2024-06-04 19:13 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-06-04 19:13 zhendong.su at inf dot ethz.ch [this message] 2024-06-04 20:04 ` [Bug tree-optimization/115347] [12/13/14/15 Regression] " pinskia at gcc dot gnu.org 2024-06-04 20:09 ` pinskia at gcc dot gnu.org 2024-06-05 7:06 ` rguenth at gcc dot gnu.org 2024-06-17 11:36 ` [Bug tree-optimization/115347] [12/13/14/15 Regression] wrong code at -O3 on x86_64-linux-gnu since r12-2097 jakub at gcc dot gnu.org 2024-06-20 9:15 ` rguenth at gcc dot gnu.org
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