[llvm-dev] Using single register class in Pat conversion in XXXInstrInfo.td

[vivek pandya via llvm-dev]

>
>
> You can't. Type inference for instruction selection requires that the
> final types in a pattern are exact (i.e. that it infers a single type
> for each node in the pattern), regardless of the output pattern. Since
> GR32 allows multiple types, you need to specify the two input patterns
> separately.
>
> -Krzysztof
>
>  I think we can make table gen generate pattern with complete type
information (when type is not specify for some input/output parameter) so
that code is less. I am not sure apart from me anyone want such feature.
But if it is good to have then I can look into it.
-Vivek
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