[Bug c++/104722] Wrong std::accumulate result with -D_GLIBCXX_PARALLEL flag

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104722

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Perhaps _GLIBCXX_PARALLEL should parallelize std::accumulate only if binary_op
is known to be associative?