wehub-resource-sync
86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
// Copyright (c) 2021 CINN Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include <map>
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#include <string>
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#include <unordered_set>
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#include <vector>
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#include "paddle/cinn/ir/ir.h"
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#include "paddle/cinn/ir/stmt.h"
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namespace cinn {
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namespace optim {
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/**
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* Replace the variable with a expression.
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* @param var The variable to replace.
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* @param expr The candidate expression.
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* @param tensor_name Name of the tensor whose indices will be edited. If it is
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* empty, means we will do the replace in all Expr instead of only in specific
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* tensor's indices.
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*/
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/**
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* Example 1: ReplaceVarWithExpr(source, Var("i"), Expr(0), "A")
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* for(i, 0, 10)
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* for(j, 0, 10)
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* B[i,j] = A[i,j]
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*
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* =>
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*
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* for(i, 0, 10)
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* for(j, 0, 10)
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* B[i,j] = A[0,j]
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*
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* Example 2: ReplaceVarWithExpr(source, Var("i"), Expr(Var("k")))
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* for(i, 0, 10)
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* for(j, 0, 10)
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* B[i,j] = A[i,j]
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*
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* =>
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*
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* for(k, 0, 10)
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* for(j, 0, 10)
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* B[k,j] = A[k,j]
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*/
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template <typename SourceType>
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void ReplaceVarWithExpr(SourceType source,
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const Var &var,
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const Expr &expr,
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const std::string &tensor_name = "");
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/**
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* Collect the specific tensor's indices.
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* @param tensor_name The specific tensor's name.
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* @return Return a vector containing all the indices of the specific tensor
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* appeared in source.
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*/
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/**
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* Example: CollectTensorIndex(source, "A")
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* for(i, 0, 10)
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* for(j, 0, 10)
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* C[i,j] = A[i,j] + A[0,j] + B[j,i] + B[i,0]
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*
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* =>
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*
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* Return value:
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* {{i,j},{0,j}}
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*/
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std::vector<std::vector<Expr>> CollectTensorIndex(
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Expr *source, const std::string &tensor_name);
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} // namespace optim
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} // namespace cinn
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