[llvm-dev] Hexagon, DFAPacketizer and instruction expansion

[Tobias Edler Von Koch via llvm-dev]

You can use the RegisterScavenger to get registers post-RA (which might 
introduce additional spills if you've run out of regs completely).

Tobias

On 11/20/2015 04:20 AM, Bruce Hoult via llvm-dev wrote:
> Sorry to butt in .. but curious ...
>
> "a RET instruction which gets expanded into a write to a register and 
> a jump/branch"
>
> If you do that after Register Allocation then where do you get the 
> temporary register from? Not knowing the architecture in question at 
> all, maybe there's a dedicated one, in which case fine. But if not?
>

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