[Mlir-commits] [mlir] [mlir][mesh] Add collective communication operations (PR #71960)

[Chengji Yao]

================
@@ -0,0 +1,72 @@
+// RUN: mlir-opt --canonicalize %s | FileCheck %s
+
+mesh.cluster @mesh0(rank = 2, dim_sizes = [2, 4])
+
+// CHECK-LABEL: func @all_reduce_mesh_axes
+func.func @all_reduce_mesh_axes(
+    %arg0 : tensor<4xf32>) -> tensor<4xf64> {
+// CHECK: mesh_axes = array<i16: 0, 1>
+  %0 = mesh.all_reduce %arg0 {
+    mesh = @mesh0, mesh_axes = array<i16: 1, 0, 0>, reduction = #mesh.partial<sum>
+    } : tensor<4xf32> -> tensor<4xf64>
+  return %0 : tensor<4xf64>
+}
+
+// CHECK-LABEL: func @all_reduce_empty_mesh_axes_and_default_reduction
----------------
yaochengji wrote:

If `mesh_axes` is empty, do we need to remove the all_reduce op? 

https://github.com/llvm/llvm-project/pull/71960