https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114864
Bug ID: 114864 Summary: wrong code at -O1 with "-fno-tree-dce -fno-tree-fre" 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: --- This appears to be a regression from 11.*, and affects 12.* and later. Compiler Explorer: https://godbolt.org/z/TbYj469r3 [588] % 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/14.0.1/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 14.0.1 20240426 (experimental) (GCC) [589] % [589] % gcctk -O1 small.c; ./a.out [590] % [590] % gcctk -O1 -fno-tree-dce -fno-tree-fre small.c [591] % ./a.out Segmentation fault [592] % [592] % cat small.c struct a { int b; } const c; void d(const struct a f) {} void e(const struct a f) { f.b == 0 ? 1 : f.b; d(f); } int main() { e(c); return 0; }