Select op support

[rpavlovicTT]

• Add select op to TTIR
• Decompose select op to TTIR slices and concat optionally
• Unit tests (negative and positive)

Fixes #1179

[mrakitaTT]

Shouldn't this op be called TTIR.SliceOp? Is it called Select in Forge? Select and Where are used in other dialects for the op that selects values from tensor based on predicate (examples: stablehlo, tosa, onnx). In TTIR we used Where, so using Select for slice op could lead to confusion.

[rpavlovicTT]

Shouldn't this op be called TTIR.SliceOp? Is it called Select in Forge? Select and Where are used in other dialects for the op that selects values from tensor based on predicate (examples: stablehlo, tosa, onnx). In TTIR we used Where, so using Select for slice op could lead to confusion.

This select is based on forge select which is not the as select in other dialects, nor it is the same as ttir.slice op. Note that it can be decomposed to many slice ops, but it's not 1:1. Based on the wide/narrow TTIR dialect design, I thought this made sense to copy select op from ForgeFE and decompose it as possible. If you have more concerns, we can discuss further offline.

[mrakitaTT]

Talked offline, seems like we just need a better name for this op. @nvukobratTT is it okay to change op names in Forge? Did you manually choose this name (Select) or was it chosen based on TVM or something?

[nvukobratTT]

Talked offline, seems like we just need a better name for this op. @nvukobratTT is it okay to change op names in Forge? Did you manually choose this name (Select) or was it chosen based on TVM or something?

It's okay to change op names in Forge, if we figure out that other is better suited :))

Most of the ops on Forge are inspired by TVM. However, I wouldn't limit us to use those names, if we find ones that are more suitable and aligned with TTIR and other frontends.

@mrakitaTT @rpavlovicTT I don't have full context, so feel free to send you proposal with a bit more details :))