https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121461
--- Comment #1 from Sam James <sjames at gcc dot gnu.org> --- Note that the thread is about a userland parser in libv4l (which does NOT use libbpf), but Clang doesn't do this optimisation for the testcase. I've tried looking for why but can't find anything clear other than old ac2e25026fa7a198c33fe521d9c02865ede12981 in llvm and cc290a9e912e68677b8c33a3c82740435a6c04d8 as well. https://patchwork.ozlabs.org/project/netdev/patch/b73889608508d98bbd4d58af032528626a4950b0.1554731339.git.dan...@iogearbox.net/
