https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79004
--- Comment #4 from Michael Meissner <meissner at gcc dot gnu.org> --- This was caused by subversion id 237806 that added small integer support in vector registers (32-bit on power8, 8/16-bit on power9). Unfortunately, the IEEE 128-bit hardware support was not adjusted for small integer support.