[GitHub] [tvm] junrushao1994 commented on a change in pull request #7765: [M1b] Scaffolding ScheduleState data structure

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

junrushao1994 commented on a change in pull request #7765:
URL: https://github.com/apache/tvm/pull/7765#discussion_r603696615



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File path: python/tvm/tir/schedule/block_scope.py
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@@ -0,0 +1,154 @@
+# 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.
+"""Definition of two pillar data structure for TensorIR scheduling: StmtSRef, BlockScope."""
+from __future__ import annotations
+
+from enum import IntEnum
+from typing import List, Optional, Union
+
+from tvm._ffi import register_object
+from tvm.runtime import Object
+from tvm.tir import Block, For
+
+from . import _ffi_api_schedule
+
+
+@register_object("tir.StmtSRef")
+class StmtSRef(Object):
+    """An object that refers to schedulable elements in the TensorIR, aka "sref".
+
+    Glossary
+    - Block sref: An StmtSref that points to a TensorIR block.
+    - Loop sref: An StmtSRef that points to a TensorIR for loop.
+    - Parent sref: The parent sref of an sref is the block/loop sref that points to its closest
+    schedulable statement of its ancestors on the TensorIR AST.
+    - Root sref: Sref to the root block. Every sref has exactly one parent sref
+    except for root sref.
+    - Sref tree: The parent-children-relationship of srefs that forms a tree,
+    uniquely determined by the TensorIR AST.
+    """
+
+    seq_index: int
+
+    @property
+    def stmt(self) -> Optional[Union[Block, For]]:
+        """The block/for stmt the object refers to"""
+        return _ffi_api_schedule.StmtSRefStmt(self)  # pylint: disable=no-member
+
+    @property
+    def parent(self) -> Optional[StmtSRef]:
+        """The parent sref"""
+        return _ffi_api_schedule.StmtSRefParent(self)  # pylint: disable=no-member
+
+    @staticmethod
+    def inline_mark() -> StmtSRef:
+        """A special StmtSRef, which doesn't point to any stmt in the AST,
+        only serving as a "mark" to hint compute-at to do the work of compute-inline"""
+        return _ffi_api_schedule.StmtSRefInlineMark()  # pylint: disable=no-member
+
+    @staticmethod
+    def root_mark() -> StmtSRef:
+        """A special StmtSRef, which doesn't point to any stmt in the AST,
+        only serving as a "mark" to hint compute-at to do nothing"""
+        return _ffi_api_schedule.StmtSRefRootMark()  # pylint: disable=no-member
+
+
+class DepKind(IntEnum):
+    """Type of dependency.
+
+    Attributes
+    ----------
+    RAW : int = 0
+        Read-after-write dependency
+    WAW : int = 1
+        Write-after-write dependency
+    WAR : int = 2
+        Write-after-read dependency. Not supported in TensorIR for now.
+    OPAQUE: int = 3
+        Opaque dependency
+    """
+
+    RAW = 0
+    WAW = 1
+    WAR = 2
+    OPAQUE = 3

Review comment:
       1. This is a slot we left for future "unknown" dependencies. Right now the codebase doesn't use this kind of dependency yet.
   2. Strictly speaking read-after-read is not a dependency, so we didn't have a slot for it right now




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