| /* |
| * 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 unwrap_vector_expr.cc |
| * \brief Utility for tracking currently active constraints |
| */ |
| |
| #include "unwrap_vector_expr.h" |
| |
| #include <tvm/arith/analyzer.h> |
| #include <tvm/tir/analysis.h> |
| #include <tvm/tir/builtin.h> |
| #include <tvm/tir/expr.h> |
| #include <tvm/tir/expr_functor.h> |
| #include <tvm/tir/op.h> |
| |
| #include <unordered_map> |
| |
| namespace tvm { |
| namespace arith { |
| |
| using namespace tir; |
| |
| class Scalarizer : public ExprMutator { |
| public: |
| explicit Scalarizer(PrimExpr lane) : lane_(lane) {} |
| |
| PrimExpr VisitExpr_(const RampNode* op) final { return op->base + lane_ * op->stride; } |
| |
| PrimExpr VisitExpr_(const BroadcastNode* op) final { return op->value; } |
| |
| PrimExpr VisitExpr_(const VarNode* op) final { |
| Var var = GetRef<Var>(op); |
| |
| auto it = let_var_remap_.find(op); |
| if (it != let_var_remap_.end()) { |
| return it->second; |
| } else { |
| return ExprMutator::VisitExpr_(op); |
| } |
| } |
| PrimExpr VisitExpr_(const LetNode* op) final { |
| if (op->value.dtype().lanes() == 1) { |
| return ExprMutator::VisitExpr_(op); |
| } |
| |
| auto it = let_var_remap_.find(op->var.get()); |
| ICHECK(it == let_var_remap_.end()) << "Duplicate binding of variable " << op->var; |
| |
| Var new_var(op->var->name_hint + "_scalar", op->var.dtype().element_of()); |
| let_var_remap_[op->var.get()] = new_var; |
| |
| PrimExpr value = this->VisitExpr(op->value); |
| PrimExpr body = this->VisitExpr(op->body); |
| |
| let_var_remap_.erase(op->var.get()); |
| return Let(op->var, value, body); |
| } |
| |
| private: |
| // The lane to extract |
| PrimExpr lane_; |
| |
| // Let binding |
| std::unordered_map<const VarNode*, Var> let_var_remap_; |
| }; |
| |
| PrimExpr UnwrapVectorExpr(const PrimExpr& vector_expr, const PrimExpr& lane) { |
| return Scalarizer(lane)(vector_expr); |
| } |
| |
| } // namespace arith |
| } // namespace tvm |