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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".
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.