https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79197
--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I see SIGILL on 0x00003fffb7e722e8 <H5T__conv_ulong_float+2744>: xscvuxdsp vs32,vs33 => 0x00003fffb7e722ec <H5T__conv_ulong_float+2748>: stxssp v0,0(r31) 0x00003fffb7e722f0 <H5T__conv_ulong_float+2752>: add r31,r31,r27 This is in libhdf5 compiled with -mcpu=power8, I believe stxssp is power9 instruction. Let me try to distill a self-contained testcase.
