https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99751
Bug ID: 99751 Summary: wrong code at -O1 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: --- [549] % 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/11.0.1/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 11.0.1 20210324 (experimental) [master revision be70bb5e4ba:220fd7ed5f2:bf1f3168f474734400e7a97660d1e7dec664bca9] (GCC) [550] % [550] % gcctk -O0 small.c; ./a.out [551] % [551] % gcctk -O1 small.c [552] % ./a.out Aborted [553] % [553] % cat small.c int *a, **c = &a; int *b(int *d) { return d; } void e(int *d) { *c = b(d); } int main() { int f = (e(&f), 0); if (a != &f) __builtin_abort(); return 0; }