[llvm-dev] Spilling to register for a given register class

[Hendrik Greving via llvm-dev]

Hello, for an architecture that doesn't have a good way to load/store a
given register class to memory, is it instead easy to spill/fill from
another register class instead?
e.g.
- storeRegToStack/loadRegFromStack use a pseudo instruction and add virtual
register operand is not supported (spill optimization doesn't seem to like
this).
- AMDGPU backend seems to do sth. similar?

The only way to safely do it seems to use register scavenger to get a temp
register, and spill this in eliminateFrameIndex? Is there an obvious way to
spill to a register instead? Thanks in advance for any hints
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