[GitHub] [tvm] comaniac commented on a change in pull request #7806: [TensorIR][PASS] LowerInitBlock

[GitBox <gi...@apache.org>]

comaniac commented on a change in pull request #7806:
URL: https://github.com/apache/tvm/pull/7806#discussion_r608852218



##########
File path: src/tir/transforms/lower_init_block.cc
##########
@@ -0,0 +1,85 @@
+/*
+ * 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.
+ */
+
+/*!
+ * Lower block init stmt into branch stmt
+ * \file lower_reduction.cc
+ */
+#include <tvm/tir/op.h>
+#include <tvm/tir/stmt_functor.h>
+#include <tvm/tir/transform.h>
+
+namespace tvm {
+namespace tir {
+
+class InitBlockLower : public StmtMutator {
+ private:
+  Stmt VisitStmt_(const BlockNode* block) final {
+    if (!block->init.defined()) {
+      return StmtMutator::VisitStmt_(block);
+    }
+    Stmt init = RealizeInitBlock(block->init.value(), block->iter_vars);
+    Stmt body = VisitStmt(block->body);
+    auto n = CopyOnWrite(block);
+    n->init = NullOpt;
+    n->body = SeqStmt::Flatten(init, body);
+    return Block(n);
+  }
+
+  static Stmt RealizeInitBlock(const Stmt& init, const Array<IterVar>& iter_vars) {

Review comment:
       Could you clarify the meaning of the word "realize" here?




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