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Where supported, VSX is a 64x128b register set which encompasses both the floating point and vector registers. In the type tests, xvsqrtdp is used as it is the only two-argument vsx opcode supported by all targets on llvm. If you need to copy a vsx register, the preferred way is "xxlor xt, xa, xa".
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.