Add assembly format for wrapper and add test

mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td

@@ -314,10 +314,10 @@ def WorkshareLoopWrapperOp : OpenMP_Op<"workshare_loop_wrapper", traits = [
     RecursiveMemoryEffects, SingleBlock
   ], singleRegion = true> {
   let summary = "contains loop nests to be parallelized by workshare";
-
   let builders = [
     OpBuilder<(ins), [{ build($_builder, $_state, {}); }]>
   ];
+  let assemblyFormat = "$region attr-dict";
 }
 
 //===----------------------------------------------------------------------===//

mlir/test/Dialect/OpenMP/ops.mlir

@@ -2810,3 +2810,64 @@ func.func @omp_target_private(%map1: memref<?xi32>, %map2: memref<?xi32>, %priv_
 
   return
 }
+
+// CHECK-LABEL: func @omp_workshare
+func.func @omp_workshare() {
+  // CHECK: omp.workshare {
+  omp.workshare {
+    "test.payload"() : () -> ()
+    // CHECK: omp.terminator
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_nowait
+func.func @omp_workshare_nowait() {
+  // CHECK: omp.workshare nowait {
+  omp.workshare nowait {
+    "test.payload"() : () -> ()
+    // CHECK: omp.terminator
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_multiple_blocks
+func.func @omp_workshare_multiple_blocks() {
+  // CHECK: omp.workshare {
+  omp.workshare {
+    cf.br ^bb2
+    ^bb2:
+    // CHECK: omp.terminator
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_loop_wrapper
+func.func @omp_workshare_loop_wrapper(%idx : index) {
+  // CHECK-NEXT: omp.workshare_loop_wrapper
+  omp.workshare_loop_wrapper {
+    // CHECK-NEXT: omp.loop_nest
+    omp.loop_nest (%iv) : index = (%idx) to (%idx) step (%idx) {
+      omp.yield
+    }
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_loop_wrapper_attrs
+func.func @omp_workshare_loop_wrapper_attrs(%idx : index) {
+  // CHECK-NEXT: omp.workshare_loop_wrapper {
+  omp.workshare_loop_wrapper {
+    // CHECK-NEXT: omp.loop_nest
+    omp.loop_nest (%iv) : index = (%idx) to (%idx) step (%idx) {
+      omp.yield
+    }
+    omp.terminator
+  // CHECK: } {attr_in_dict}
+  } {attr_in_dict}
+  return
+}