https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70957
--- Comment #11 from Bill Schmidt <wschmidt at gcc dot gnu.org> --- OK, I've traced this down to its sordid origins. The problem arises when the test case is run on a machine using an old target assembler. If the assembler doesn't support POWER8 instructions, this causes TARGET_P8_VECTOR to be disabled. If TARGET_P8_VECTOR is disabled, TARGET_P9_VECTOR is likewise disabled, which means that the P9-specific built-ins are not tied to the built-in overload table. So even though these tests are compile-only, the configuration test that determines the assembler isn't up to speed causes these tests to fail. I'll have to add a dg-require-effective-target to fix this.
