1/*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20/*!
21 * \file tir/transforms/convert_for_loops_serial.cc
22 * \brief Convert all for loops to serial for lesser memory consumption
23 */
24#include <tvm/arith/analyzer.h>
25#include <tvm/runtime/device_api.h>
26#include <tvm/tir/function.h>
27#include <tvm/tir/stmt_functor.h>
28#include <tvm/tir/transform.h>
29
30namespace tvm {
31namespace tir {
32
33class ForLoopSerialConverter : public StmtExprMutator {
34 public:
35 ForLoopSerialConverter() = default;
36 Stmt operator()(const PrimFunc& func);
37
38 private:
39 Stmt VisitStmt_(const ForNode* op) override;
40};
41
42Stmt ForLoopSerialConverter::VisitStmt_(const ForNode* op) {
43 if (op->kind == ForKind::kParallel) {
44 return For(op->loop_var, op->min, op->extent, ForKind::kSerial, op->body, op->thread_binding,
45 op->annotations, op->span);
46 }
47 return StmtExprMutator::VisitStmt_(op);
48}
49
50Stmt ForLoopSerialConverter::operator()(const PrimFunc& func) {
51 return this->VisitStmt(func->body);
52}
53
54PrimFunc ConvertForLoopsToSerial(PrimFunc func) {
55 PrimFuncNode* fptr = func.CopyOnWrite();
56 fptr->body = ForLoopSerialConverter()(func);
57 return func;
58}
59
60namespace transform {
61
62Pass ConvertForLoopsToSerial() {
63 auto pass_func = [=](PrimFunc f, IRModule m, PassContext ctx) {
64 return ConvertForLoopsToSerial(std::move(f));
65 };
66 return CreatePrimFuncPass(pass_func, 0, "tir.ConvertForLoopsToSerial", {});
67}
68
69TVM_REGISTER_GLOBAL("tir.transform.ConvertForLoopsToSerial")
70 .set_body_typed(ConvertForLoopsToSerial);
71
72} // namespace transform
73
74} // namespace tir
75} // namespace tvm
76