llvm-project

f0967fca - [mlir][LLVM] `FuncToLLVM`: Add 1:N type conversion support (#153823)

[mlir][LLVM] `FuncToLLVM`: Add 1:N type conversion support (#153823) Add support for 1:N type conversions to the `FuncToLLVM` lowering patterns. This commit does not change the lowering of any types (such as `MemRefType`). It just sets up the infrastructure, such that 1:N type conversions can be used during `FuncToLLVM`. Note: When the converted result types of a `func.func` have more than 1 type, then the results are wrapped in an `llvm.struct`. That's because `llvm.func` does not support multiple result values. This "wrapping" was already implemented for cases where the original `func.func` has multiple results. With 1:N conversions, even a single result can now expand to multiple converted results, triggering the same wrapping mechanism. The test cases are exercised with both the old and the new no-rollback conversion driver.