[llvm-dev] tablegen generated enums in tablegen

[Chris Sears via llvm-dev]

I figured out the answer to my problem. I use const MCInstrDesc  desc =
MCII->get(x) to get the same information. It's just that I was writing
TableGen descriptions and so I thought the answer would be in TableGen.

On Sat, Jun 27, 2020 at 10:49 AM Chris Sears <chris.sears at gmail.com> wrote:

> I'd like to store a tablegen generated enumeration in a record
> field/value. Clearly this enumeration isn't available yet so it seems that
> a code fragment should be the escape mechanism I need. Looking at the other
> backends for examples, I see things like
>
>     [{ return Imm >= 0 && Imm < 64; }]               // promising
>     code Requires = [{ {} }];                                 // this looks
> like a string
>     let Requires = [{ {AArch64::FeatureETE} }].  // which is not promising
>
> So I think that this would look something like:
>
>     int reg_index           = -1;
>     ...
>     let reg_index = [{ return XX::R8; }];               // or
>     let reg_index = [{ {XX::R8} }];
>
> However, then I get errors of the form:
>
>     error: Value 'reg_index' of type 'int' is incompatible with
> initializer '[{ {XX::R8} }]' of type 'code'
>     error: Value 'reg_index' of type 'int' is incompatible with
> initializer '[{ return XX::R8; }]' of type 'code'
>
> Is there a way of doing this? I don't understand TableGen casting but is
> that necessary?
>


-- 
Ite Ursi
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