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There is no support with VSX for Superword Level Parallelization in PPC.

backport of

JDK-8194861 PPC64: Need support for VSR spills in ppc.ad

relates to

JDK-8351666 [PPC64] Make non-volatile VectorRegisters available for C2 register allocation

JDK-8289856 [PPC64] SIGSEGV in C2Compiler::init_c2_runtime() after JDK-8289060

JDK-8210497 [PPC64] Vector registers not saved across safepoint

JDK-8188802 PPC64: Failure on assert(lrgmask.is_aligned_sets(RegMask::SlotsPerVecX))

JDK-8188757 PPC64: Need to disable VSR52-63 in ppc.ad

JDK-8290082 [PPC64] ZGC C2 load barrier stub needs to preserve vector registers

(2 relates to)