5f5b3bb22b
In mixed matmul lowering (e.g., i8 to i32) we're seeing the following sequence: %0 = arith.extsi %src : vector<4x[8]xi8> to vector<4x[8]xi32> %1 = vector.extract %0[0] : vector<[8]xi32> from vector<4x[8]xi32> %lhs = vector.scalable.extract %1[0] : vector<[4]xi32> from vector<[8]xi32> ... (same for rhs) %2 = vector.outerproduct %lhs, %rhs, %acc vector<[4]xi32>, vector<[4]xi32> // x4 chained by accumulator This chain of 4 outer products can be fused into a single 4-way widening variant but the pass doesn't match on the IR, as it expects the source of the inputs to be an extend and it can't look through the extracts. This patch fixes this with two rewrites that swaps extract(extend) into extend(extract). Related to #78975, #79288.
Multi-Level Intermediate Representation
See https://mlir.llvm.org/ for more information.