The PPC64 xsmaxcdp instruction support is missing. There are bugs with regards to the correct output from the xsmincdp, lxssp and stxvl instructions. The expected results for test_isa_3_0_other and test_isa_3_0_altivec need updating.
Issues fixed with commit d09b3b740c5c9c88166f64bc9bf401738a0f51eb on April 11, 2018.