llvm dev - Jan 2022 - Converting between different but same-sized floating-point types

If a narrowing floating-point conversion is fptrunc, and a widening one is
fpext, what instruction is used for a conversion between half and bfloat?
It is neither purely narrowing nor purely widening, nor is it a bitcast
that just reinterprets the bits.

Similarly, what happens in the case of fp128 and ppc_fp128?
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