buffer.h

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/*
 * 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.
 */
 
#ifndef TVM_TIR_BUFFER_H_
#define TVM_TIR_BUFFER_H_
 
#include <tvm/ffi/container/array.h>
#include <tvm/ffi/reflection/registry.h>
#include <tvm/ffi/string.h>
#include <tvm/ir/expr.h>
#include <tvm/node/script_printer.h>
#include <tvm/tir/var.h>
 
#include <string>
 
namespace tvm {
namespace tir {
 
#ifndef TVM_INDEX_DEFAULT_I64
#define TVM_INDEX_DEFAULT_I64 1
#endif
inline DataType DefaultIndexType() {
#if TVM_INDEX_DEFAULT_I64
  return DataType::Int(64);
#else
  return DataType::Int(32);
#endif
}
 
// forward declare Stmt
class Stmt;
 
enum BufferType : int {
  kDefault = 1,
  // Maps buffer[i][j][k] -> buffer[i][0][k] if dimension i's shape equals 1.
  kAutoBroadcast = 2,
};
 
class BufferNode : public Object {
 public:
  // Data fields.
  Var data;
  DataType dtype;
  Array<PrimExpr> shape;
  Array<IntImm> axis_separators;
  Array<PrimExpr> strides;
  PrimExpr elem_offset;
  // Meta data
  String name;
  int data_alignment;
  int offset_factor;
  BufferType buffer_type;
  mutable Span span;
  BufferNode() {}
 
  static void RegisterReflection() {
    namespace refl = tvm::ffi::reflection;
    refl::ObjectDef<BufferNode>()
        .def_ro("data", &BufferNode::data, refl::AttachFieldFlag::SEqHashDef())
        .def_ro("dtype", &BufferNode::dtype)
        .def_ro("shape", &BufferNode::shape, refl::AttachFieldFlag::SEqHashDef())
        .def_ro("strides", &BufferNode::strides, refl::AttachFieldFlag::SEqHashDef())
        .def_ro("axis_separators", &BufferNode::axis_separators,
                refl::AttachFieldFlag::SEqHashDef())
        .def_ro("elem_offset", &BufferNode::elem_offset, refl::AttachFieldFlag::SEqHashDef())
        .def_ro("name", &BufferNode::name, refl::AttachFieldFlag::SEqHashIgnore())
        .def_ro("data_alignment", &BufferNode::data_alignment)
        .def_ro("offset_factor", &BufferNode::offset_factor)
        .def_ro("buffer_type", &BufferNode::buffer_type)
        .def_ro("span", &BufferNode::span, refl::AttachFieldFlag::SEqHashIgnore());
  }
 
  DataType DefaultIndexType() const {
    return shape.size() != 0 ? shape[0].dtype() : tvm::tir::DefaultIndexType();
  }
 
  Array<PrimExpr> ElemOffset(Array<PrimExpr> index) const;
 
  static constexpr const char* _type_key = "tir.Buffer";
  static constexpr TVMFFISEqHashKind _type_s_eq_hash_kind = kTVMFFISEqHashKindTreeNode;
 
  TVM_DECLARE_FINAL_OBJECT_INFO(BufferNode, Object);
  TVM_OBJECT_ENABLE_SCRIPT_PRINTER();
};
 
class Buffer : public ObjectRef {
 public:
  // User can specify data_alignment and offset_factor to be 0
  // A default value will be picked.
  TVM_DLL Buffer(Var data, DataType dtype, Array<PrimExpr> shape, Array<PrimExpr> strides,
                 PrimExpr elem_offset, String name, int data_alignment, int offset_factor,
                 BufferType buffer_type, Array<IntImm> axis_separators = {}, Span span = Span());
 
  TVM_DLL Buffer MakeStrideView() const;
  TVM_DLL Buffer MakeSlice(Array<PrimExpr> begins, Array<PrimExpr> extents) const;
  TVM_DLL PrimExpr access_ptr(int access_mask, DataType ptr_type = DataType::Handle(),
                              int content_lanes = 1, PrimExpr offset = IntImm(DataType::Int(32), 0),
                              Optional<PrimExpr> input_extent = std::nullopt) const;
  TVM_DLL PrimExpr vload(Array<PrimExpr> begin, DataType dtype,
                         Optional<PrimExpr> predicate = std::nullopt) const;
  TVM_DLL Stmt vstore(Array<PrimExpr> begin, PrimExpr value,
                      Optional<PrimExpr> predicate = std::nullopt) const;
 
  Buffer GetFlattenedBuffer() const;
 
  Array<PrimExpr> OffsetOf(Array<PrimExpr> index) const;
 
  TVM_DLL String scope() const;
 
  TVM_DEFINE_OBJECT_REF_METHODS(Buffer, ObjectRef, BufferNode);
  TVM_DEFINE_OBJECT_REF_COW_METHOD(BufferNode);
};
 
TVM_DLL Buffer decl_buffer(Array<PrimExpr> shape, DataType dtype = DataType::Float(32),
                           String name = "buffer", String storage_scope = "",
                           Optional<Array<IntImm>> axis_separators = std::nullopt,
                           Span span = Span());
 
class DataProducerNode : public PrimExprConvertibleNode {
 public:
  virtual ~DataProducerNode() {}
  virtual Array<PrimExpr> GetShape() const = 0;
  virtual DataType GetDataType() const = 0;
  virtual String GetNameHint() const = 0;
 
  static constexpr const char* _type_key = "tir.DataProducer";
  TVM_DECLARE_BASE_OBJECT_INFO(DataProducerNode, PrimExprConvertibleNode);
};
 
class DataProducer : public PrimExprConvertible {
 public:
  TVM_DEFINE_OBJECT_REF_METHODS(DataProducer, PrimExprConvertible, DataProducerNode);
};
 
TVM_DLL tir::Buffer BufferWithOffsetAlignment(Array<PrimExpr> shape, DataType dtype,
                                              std::string name, int data_alignment,
                                              int offset_factor, bool compact,
                                              std::string memory_scope = "");
}  // namespace tir
}  // namespace tvm
#endif  // TVM_TIR_BUFFER_H_