match depend of eliminate cast

mindspore/ccsrc/frontend/optimizer/irpass/cast_eliminate.cc

@@ -25,10 +25,20 @@
 namespace mindspore {
 namespace opt {
 namespace irpass {
+AnfNodePtr TransThroughDepend(const AnfNodePtr &node) {
+  auto cur_node = node;
+  while (IsPrimitiveCNode(cur_node, prim::kPrimDepend)) {
+    cur_node = cur_node->cast<CNodePtr>()->input(1);
+  }
+  return cur_node;
+}
+
+bool IsValueNode(const AnfNodePtr &node) { return IsVNode(TransThroughDepend(node)); }
+
 // {prim::kPrimCast, X, T}
 AnfNodePtr CastSameTypeEliminater::operator()(const OptimizerPtr &, const AnfNodePtr &node) {
   Reset();
-  AnfVisitor::Match(prim::kPrimCast, {IsNode, IsVNode})(node);
+  AnfVisitor::Match(prim::kPrimCast, {IsNode, IsValueNode})(node);
 
   // check pattern match
   if (tgt_ == nullptr) {
@@ -50,6 +60,11 @@ AnfNodePtr CastSameTypeEliminater::operator()(const OptimizerPtr &, const AnfNod
   }
 
   if (src_type->type_id() == tgt_type->type_id()) {
+    if (IsPrimitiveCNode(node->cast<CNodePtr>()->input(2), prim::kPrimDepend)) {
+      auto new_depend =
+        node->func_graph()->NewCNode({NewValueNode(prim::kPrimDepend), src_, node->cast<CNodePtr>()->input(2)});
+      return new_depend;
+    }
     return src_;
   }
 
@@ -57,10 +72,11 @@ AnfNodePtr CastSameTypeEliminater::operator()(const OptimizerPtr &, const AnfNod
 }
 
 void CastSameTypeEliminater::Visit(const AnfNodePtr &node) {
+  auto cur_node = TransThroughDepend(node);
   if (src_ == nullptr) {
-    src_ = node;
+    src_ = cur_node;
   } else {
-    tgt_ = node;
+    tgt_ = cur_node;
   }
 }