[llvm-dev] supporting a type but not supporting an operaion

[Rail Shafigulin via llvm-dev]

>
> A type is "supported" (i.e. legal) if there is a register that can hold
> it.  Specifically, if there is a register class associated with that type.
> A support of an operation means that there is an instruction (or a short
> sequence of instructions) that implements given operation.
> For example, a target can have 128-bit registers, but the only
> instructions that use them may be load, store and an arithmetic "add". In
> such a case, i128 is a supported type, but a "sub" operation on 128-bit
> values is not.
>
> -Krzysztof
>
> Oh I see.  Thanks.

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-- 
Rail Shafigulin
Software Engineer
Esencia Technologies
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