https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82479
David Malcolm <dmalcolm at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dmalcolm at gcc dot gnu.org --- Comment #8 from David Malcolm <dmalcolm at gcc dot gnu.org> --- FWIW, llvm appears to implement this within: https://github.com/llvm-mirror/llvm/blob/master/lib/Transforms/Scalar/LoopIdiomRecognize.cpp (Matt Godbolt mentioned this in his recent CppCon talk: https://youtu.be/bSkpMdDe4g4?t=2408 )