[Mlir-commits] [mlir] [mlir][spirv] Handle signedness casts (PR #155388)

[Michael Platings]

mplatings wrote:

> What produces these unrealized_conversion_casts? Could you show the input SPIR-V that runs into the signess issue?

One instance is #141096.
https://github.com/arm/ai-ml-sdk-model-converter can also generate content that ends up as unsigned inputs.

The problem I'm encountering is around [TOSA rescale](https://www.mlplatform.org/tosa/tosa_spec_1_0_1.html#_rescale) because there's tooling that wants to use tensors of unsigned type if input_unsigned or output_unsigned are true.

https://github.com/llvm/llvm-project/pull/155388