| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| /*! |
| * \file simple_analysis.cc |
| * \brief Implementation of simple passes |
| */ |
| #include <tvm/tir/analysis.h> |
| #include <tvm/tir/expr.h> |
| #include <tvm/tir/stmt_functor.h> |
| |
| namespace tvm { |
| namespace tir { |
| |
| class VarTouchVisitor : public ExprVisitor { |
| public: |
| explicit VarTouchVisitor(std::function<bool(const VarNode*)> var_set) : var_set_(var_set) {} |
| |
| void VisitExpr(const PrimExpr& e) final { |
| if (use_var_) return; |
| ExprVisitor::VisitExpr(e); |
| } |
| |
| void VisitExpr_(const VarNode* op) final { Handle(op); } |
| |
| void VisitExpr_(const LoadNode* op) final { |
| Handle(op->buffer_var.get()); |
| ExprVisitor::VisitExpr_(op); |
| } |
| |
| void Handle(const VarNode* var) { |
| if (var_set_(var)) use_var_ = true; |
| } |
| |
| bool use_var_{false}; |
| |
| private: |
| std::function<bool(const VarNode*)> var_set_; |
| }; |
| |
| bool ExprUseVar(const PrimExpr& e, std::function<bool(const VarNode*)> var_set) { |
| VarTouchVisitor visitor(var_set); |
| visitor(e); |
| return visitor.use_var_; |
| } |
| |
| } // namespace tir |
| } // namespace tvm |