[mlir][vector] Support multi-dimensional vectors in VectorFromElementsLowering (#151175) This patch introduces a new unrolling-based approach for lowering multi-dimensional `vector.from_elements` operations. **Implementation Details:** 1. **New Transform Pattern**: Added `UnrollFromElements` that unrolls a N-D(N>=2) from_elements op to a (N-1)-D from_elements op align the outermost dimension. 2. **Utility Functions**: Added `unrollVectorOp` to reuse the unroll algo of vector.gather for vector.from_elements. 3. **Integration**: Added the unrolling pattern to the convert-vector-to-llvm pass as a temporal transformation. 4. Use direct LLVM dialect operations instead of intermediate vector.insert operations for efficiency in `VectorFromElementsLowering`. **Example:** ```mlir // unroll %v = vector.from_elements %e0, %e1, %e2, %e3 : vector<2x2xf32> => %poison_2d = ub.poison : vector<2x2xf32> %vec_1d_0 = vector.from_elements %e0, %e1 : vector<2xf32> %vec_2d_0 = vector.insert %vec_1d_0, %poison_2d [0] : vector<2xf32> into vector<2x2xf32> %vec_1d_1 = vector.from_elements %e2, %e3 : vector<2xf32> %result = vector.insert %vec_1d_1, %vec_2d_0 [1] : vector<2xf32> into vector<2x2xf32> // convert-vector-to-llvm %v = vector.from_elements %e0, %e1, %e2, %e3 : vector<2x2xf32> => %poison_2d = ub.poison : vector<2x2xf32> %poison_2d_cast = builtin.unrealized_conversion_cast %poison_2d : vector<2x2xf32> to !llvm.array<2 x vector<2xf32>> %poison_1d_0 = llvm.mlir.poison : vector<2xf32> %c0_0 = llvm.mlir.constant(0 : i64) : i64 %vec_1d_0_0 = llvm.insertelement %e0, %poison_1d_0[%c0_0 : i64] : vector<2xf32> %c1_0 = llvm.mlir.constant(1 : i64) : i64 %vec_1d_0_1 = llvm.insertelement %e1, %vec_1d_0_0[%c1_0 : i64] : vector<2xf32> %vec_2d_0 = llvm.insertvalue %vec_1d_0_1, %poison_2d_cast[0] : !llvm.array<2 x vector<2xf32>> %poison_1d_1 = llvm.mlir.poison : vector<2xf32> %c0_1 = llvm.mlir.constant(0 : i64) : i64 %vec_1d_1_0 = llvm.insertelement %e2, %poison_1d_1[%c0_1 : i64] : vector<2xf32> %c1_1 = llvm.mlir.constant(1 : i64) : i64 %vec_1d_1_1 = llvm.insertelement %e3, %vec_1d_1_0[%c1_1 : i64] : vector<2xf32> %vec_2d_1 = llvm.insertvalue %vec_1d_1_1, %vec_2d_0[1] : !llvm.array<2 x vector<2xf32>> %result = builtin.unrealized_conversion_cast %vec_2d_1 : !llvm.array<2 x vector<2xf32>> to vector<2x2xf32> ``` --------- Co-authored-by: Nicolas Vasilache <Nico.Vasilache@amd.com> Co-authored-by: Yang Bai <yangb@nvidia.com> Co-authored-by: James Newling <james.newling@gmail.com> Co-authored-by: Diego Caballero <dieg0ca6aller0@gmail.com>
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