[mlir][linalg] Add an e2e test for linalg.matmul_transpose_a to ArmSME (#71644)

This patch adds an integration test demonstrating the first e2e example
lowering a linalg.matmul to SME via vector.outerproduct.

The test uses a 'linalg.matmul_transpose_a' rather than 'linalg.matmul'
since the latter emits a 'vector.transfer_read' with a vector type of
'vector<[4]x1xf32>' that can't be currently lowered via generic (SVE)
path, since it has leading scalable dim.

Author: c-rhodes

mlir/test/Integration/Dialect/Linalg/CPU/ArmSME/matmul-transpose-a.mlir

@@ -0,0 +1,96 @@
+// RUN: mlir-opt %s \
+// RUN:   -transform-interpreter -test-transform-dialect-erase-schedule \
+// RUN:   -one-shot-bufferize="bufferize-function-boundaries" -canonicalize \
+// RUN:   -enable-arm-streaming="mode=locally enable-za" \
+// RUN:   -convert-vector-to-arm-sme -convert-arm-sme-to-scf \
+// RUN:   -convert-vector-to-scf -cse -arm-sve-legalize-vector-storage \
+// RUN:   -convert-vector-to-llvm=enable-arm-sme \
+// RUN:   -convert-vector-to-llvm=enable-arm-sve \
+// RUN:   -cse -canonicalize -allocate-arm-sme-tiles -test-lower-to-llvm | \
+// RUN: %mcr_aarch64_cmd \
+// RUN:   -e=main -entry-point-result=void \
+// RUN:   -march=aarch64 -mattr="+sve,+sme" \
+// RUN:   -shared-libs=%mlir_runner_utils,%mlir_c_runner_utils | \
+// RUN: FileCheck %s
+
+func.func @matmul_transpose_a(%A : tensor<?x?xf32>, %B : tensor<?x?xf32>, %C : tensor<?x?xf32>) {
+  %res = linalg.matmul_transpose_a ins(%A, %B: tensor<?x?xf32>, tensor<?x?xf32>)
+                                   outs(%C: tensor<?x?xf32>) -> tensor<?x?xf32>
+  %xf = tensor.cast %res : tensor<?x?xf32> to tensor<*xf32>
+  call @printMemrefF32(%xf) : (tensor<*xf32>) -> ()
+  return
+}
+
+func.func @main() {
+  %c0 = arith.constant 0 : i32
+  %c7 = arith.constant 7 : index
+
+  %A = arith.constant dense<[
+    [ 1.,  2.,  3.,  4.,  5.,  6.,  7.],
+    [ 8.,  9., 10., 11., 12., 13., 14.],
+    [15., 16., 17., 18., 19., 20., 21.],
+    [22., 23., 24., 25., 26., 27., 28.],
+    [29., 30., 31., 32., 33., 34., 35.],
+    [36., 37., 38., 39., 40., 41., 42.],
+    [43., 44., 45., 46., 47., 48., 49.],
+    [50., 51., 52., 53., 54., 55., 56.],
+    [57., 58., 59., 60., 61., 62., 63.],
+    [64., 65., 66., 67., 68., 69., 70.],
+    [71., 72., 73., 74., 75., 76., 77.],
+    [78., 79., 80., 81., 82., 83., 84.],
+    [85., 86., 87., 88., 89., 90., 91.]
+  ]> : tensor<13x7xf32>
+
+  %A_dyn = tensor.cast %A : tensor<13x7xf32> to tensor<?x?xf32>
+
+  %C_init = bufferization.alloc_tensor(%c7, %c7) : tensor<?x?xf32>
+  %C = linalg.fill ins(%c0 : i32) outs(%C_init : tensor<?x?xf32>) -> tensor<?x?xf32>
+
+  // CHECK: Unranked Memref {{.*}} rank = 2 offset = 0 sizes = [7, 7] strides = [7, 1] data =
+  // CHECK: [32955, 33514, 34073, 34632, 35191, 35750, 36309]
+  // CHECK: [33514, 34086, 34658, 35230, 35802, 36374, 36946]
+  // CHECK: [34073, 34658, 35243, 35828, 36413, 36998, 37583]
+  // CHECK: [34632, 35230, 35828, 36426, 37024, 37622, 38220]
+  // CHECK: [35191, 35802, 36413, 37024, 37635, 38246, 38857]
+  // CHECK: [35750, 36374, 36998, 37622, 38246, 38870, 39494]
+  // CHECK: [36309, 36946, 37583, 38220, 38857, 39494, 40131]
+  call @matmul_transpose_a(%A_dyn, %A_dyn, %C) : (tensor<?x?xf32>, tensor<?x?xf32>, tensor<?x?xf32>) -> ()
+
+  return
+}
+
+module attributes {transform.with_named_sequence} {
+  transform.named_sequence @__transform_main(%module : !transform.any_op {transform.readonly}) {
+    %matmul_transpose_a = transform.structured.match ops{["linalg.matmul_transpose_a"]} in %module
+      : (!transform.any_op) -> !transform.any_op
+
+    // Step 1: Tile for size [4] x [4], which corresponds to SVLs x SVLs, where
+    //         SVLs is the number of 32-bit elements in a vector of SVL bits.
+    %tiled_linalg_op, %loops:3 = transform.structured.tile_using_for %matmul_transpose_a[[4], [4], 1]
+      : (!transform.any_op) -> (!transform.any_op, !transform.any_op, !transform.any_op, !transform.any_op)
+
+    // Step 2: Vectorize.
+    transform.structured.vectorize %tiled_linalg_op vector_sizes [[4], [4], 1]
+      : !transform.any_op
+
+    %func = transform.structured.match ops{["func.func"]} in %module
+      : (!transform.any_op) -> !transform.any_op
+
+    // Step 3: Lower vector.multi_reduction to vector.contract (+ some helpful patterns).
+    transform.apply_patterns to %func {
+      transform.apply_patterns.vector.lower_masked_transfers
+      transform.apply_patterns.vector.transfer_permutation_patterns
+      transform.apply_patterns.vector.reduction_to_contract
+    } : !transform.any_op
+
+    // Step 4: Lower vector.contract to vector.outerproduct.
+    transform.apply_patterns to %func {
+      transform.apply_patterns.vector.lower_contraction lowering_strategy = "outerproduct"
+      transform.apply_patterns.vector.lower_masks
+    } : !transform.any_op
+
+    transform.yield
+  }
+}
+
+func.func private @printMemrefF32(%ptr : tensor<*xf32>)