Matthias Springer c6ff2446a4 [mlir][vector] Add vector.from_elements op (#95938) ...

This commit adds a new operation to the vector dialect:
`vector.from_elements`

The op constructs a new vector from a given list of scalar values. It is
similar to `tensor.from_elements`.
```mlir
%0 = vector.from_elements %a, %b, %c, %a, %a, %a : vector<2x3xf32>
```

Constructing a new vector from elements was tedious before this op
existed: a typical way was to define an `arith.constant ... :
vector<...>`, followed by a chain of `vector.insert`.

Folders/canonicalizations are added that can fold `vector.extract` ops
and convert the `vector.from_elements` op into a `vector.splat` op.

The LLVM lowering generates an `llvm.mlir.undef`, followed by a sequence
of scalar insertions in the form of `llvm.insertelement`. Only 0-D and
1-D vectors are currently supported in the LLVM lowering.

2024-06-19 09:58:37 +02:00

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