https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102364
Bug ID: 102364 Summary: wrong code at -O1 and above 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: --- [581] % 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 20210916 (experimental) [master r12-3577-g275a076f762] (GCC) [582] % [582] % gcctk -O0 small.c; a.out [583] % [583] % gcctk -O1 small.c [584] % ./a.out Aborted [585] % [585] % cat small.c int a, b, *c = &b; short d; int main() { unsigned e = 1; for (d = 9; d > 8; d += 2) { int *f = &a, **g = &f; if (d > ++e) *g = c; if (f != &b) __builtin_abort (); } return 0; }