https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97836
Bug ID: 97836 Summary: wrong code at -O1 on x86_64-pc-linux-gnu Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization Assignee: unassigned at gcc dot gnu.org Reporter: zhendong.su at inf dot ethz.ch Target Milestone: --- [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/11.0.0/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 11.0.0 20201115 (experimental) [master revision 406b452dc0e:d88ff5a679d:faab61b585a8b4a42454f085dd6b7815992a98f5] (GCC) [511] % [511] % gcctk -O0 small.c; ./a.out [512] % [512] % gcctk -O1 small.c; ./a.out Aborted [513] % [513] % cat small.c int *a, b; int *f(int *c) { b = 0; return c; } int main() { int d; a = f(&d); if (a != &d) __builtin_abort (); return 0; }