[Mlir-commits] [mlir] [mlir-c] Add TypeConverter source and target materialization (PR #208934)

[llvmlistbot at llvm.org]

================

----------------
PragmaTwice wrote:

I checked the signature in C++ and it seems for target materialization it's more complicated?
```c++
  /// Generate a wrapper for the given target materialization callback.
  /// The callback may take any subclass of `Type` and the wrapper will check
  /// for the target type to be of the expected class before calling the
  /// callback.
  ///
  /// With callback of form:
  /// - Value(OpBuilder &, T, ValueRange, Location, Type)
  /// - SmallVector<Value>(OpBuilder &, TypeRange, ValueRange, Location, Type)
  template <typename T, typename FnT>
  std::enable_if_t<
      std::is_invocable_v<FnT, OpBuilder &, T, ValueRange, Location, Type>,
      TargetMaterializationCallbackFn>
  wrapTargetMaterialization(FnT &&callback) const {
```

It can accept an additional `Type` and return a list of `Value`s (for 1:N conversion?). Note that for source materialization this callback models 1:N conversion already (i.e. `intptr_t nInputs, MlirValue *inputs`).

https://github.com/llvm/llvm-project/pull/208934