[llvm-dev] TableGen GlobalISelEmitter unable to handle trivial pattern

[Tom Stellard via llvm-dev]

On 06/30/2019 03:08 PM, Matt Arsenault via llvm-dev wrote:
> Hi,
> 
> I’m looking at some patterns which failed to import, and when I reduced them I was surprised to find a variety of complicated patterns successfully import, but the most trivial patterns I can come up with fail. If I add this pattern to test/TableGen/GlobalISelEmitter.td:
> 
> def : Pat <
>   (mul i32:$y, i32:$x),
>   (MUL $x, $y)
>> ;
> 
> test/TableGen/GlobalISelEmitter.td:1196:1: warning: Skipped pattern: Dst pattern child is an unsupported kind
> def : Pat <
> 
> What am I missing?

I believe that the importer requires that you use register classes instead of types
for the operands.

-Tom
> 
> -Matt
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