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lower_tvm_builtin.cc
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lower_tvm_builtin.cc
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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.
*/
/*!
* Lower TVM related builtin intrinsics such as packed call.
* \file tir/transforms/lower_tvm_buildin.cc
*/
#include <tvm/runtime/registry.h>
#include <tvm/tir/builtin.h>
#include <tvm/tir/expr.h>
#include <tvm/tir/stmt_functor.h>
#include <tvm/tir/transform.h>
#include <unordered_set>
#include "ir_utils.h"
namespace tvm {
namespace tir {
// Calculate the statistics of packed function.
// These information are needed during codegen.
class BuiltinLower : public StmtExprMutator {
public:
// Record stack frame for existing scope.
struct AllocaScope {
Var stack_shape = Var("stack_shape", DataType::Handle());
Var stack_array = Var("stack_array", DataType::Handle());
Var stack_value = Var("stack_value", DataType::Handle());
Var stack_tcode = Var("stack_tcode", DataType::Handle());
int64_t max_shape_stack{-1};
uint64_t max_array_stack{0};
uint64_t max_arg_stack{0};
int64_t run_shape_stack{-1};
uint64_t run_array_stack{0};
uint64_t run_arg_stack{0};
};
Stmt Build(Stmt stmt) { return this->VisitBodyAndRealizeAlloca(stmt); }
// Allcoate stack frames, only at parallel-for or root.
Stmt VisitBodyAndRealizeAlloca(Stmt stmt) {
alloca_scope_.emplace_back();
stmt = this->VisitStmt(stmt);
ICHECK(!alloca_scope_.empty());
auto& scope = alloca_scope_.back();
if (scope.max_shape_stack != -1) {
stmt = LetStmt(scope.stack_shape, StackAlloca("shape", scope.max_shape_stack), stmt);
}
if (scope.max_array_stack != 0) {
stmt = LetStmt(scope.stack_array, StackAlloca("array", scope.max_array_stack), stmt);
}
if (scope.max_arg_stack != 0) {
stmt = LetStmt(scope.stack_value, StackAlloca("arg_value", scope.max_arg_stack), stmt);
stmt = LetStmt(scope.stack_tcode, StackAlloca("arg_tcode", scope.max_arg_stack), stmt);
}
alloca_scope_.pop_back();
return stmt;
}
Stmt VisitStmt(const Stmt& s) final {
// allocate space to hold prepare stmts before s
prep_seq_stack_.emplace_back(std::vector<Stmt>());
auto stmt = StmtExprMutator::VisitStmt(s);
auto& scope = alloca_scope_.back();
ICHECK_EQ(scope.run_shape_stack, -1);
ICHECK_EQ(scope.run_array_stack, 0);
auto prep_seq = std::move(prep_seq_stack_.back());
prep_seq_stack_.pop_back();
if (prep_seq.size() != 0) {
Stmt ret = SeqStmt::Flatten(prep_seq, stmt);
return ret;
} else {
return stmt;
}
}
Stmt VisitStmt_(const LetStmtNode* op) final {
if (const CallNode* call = op->value.as<CallNode>()) {
if (call->op.same_as(builtin::texture2d_alloca())) {
return StmtExprMutator::VisitStmt(MakeTextureAlloc(op, call));
}
}
return StmtExprMutator::VisitStmt_(op);
}
Stmt VisitStmt_(const AllocateNode* op) {
// Lower allocate to device allocate when needed.
Stmt stmt = StmtExprMutator::VisitStmt_(op);
op = stmt.as<AllocateNode>();
// Get constant allocation bound.
int64_t nbytes = GetVectorBytes(op->dtype);
if (device_type_.defined()) {
if (const auto* dev_type = device_type_.as<IntImmNode>()) {
if (dev_type->value == kDLCPU) {
int32_t constant_size = op->constant_allocation_size();
if (constant_size > 0 && constant_size * nbytes < runtime::kMaxStackAlloca) {
return stmt;
}
}
}
}
PrimExpr total_bytes = make_const(op->extents[0].dtype(), nbytes);
for (size_t i = 0; i < op->extents.size(); ++i) {
total_bytes = total_bytes * op->extents[i];
}
ICHECK(device_type_.defined()) << "Unknown device type in current IR";
ICHECK(device_id_.defined()) << "Unknown device id in current IR";
Stmt throw_last_error = Evaluate(Call(DataType::Int(32), builtin::tvm_throw_last_error(), {}));
Stmt body = SeqStmt({IfThenElse(Call(DataType::Bool(1), builtin::isnullptr(), {op->buffer_var}),
throw_last_error),
op->body});
Stmt alloca = LetStmt(
op->buffer_var,
Call(op->buffer_var.dtype(), Op::Get("tir.TVMBackendAllocWorkspace"),
{cast(DataType::Int(32), device_type_), cast(DataType::Int(32), device_id_),
cast(DataType::UInt(64), total_bytes), IntImm(DataType::Int(32), op->dtype.code()),
IntImm(DataType::Int(32), op->dtype.bits())}),
body);
PrimExpr free_op = Call(DataType::Int(32), Op::Get("tir.TVMBackendFreeWorkspace"),
{cast(DataType::Int(32), device_type_),
cast(DataType::Int(32), device_id_), op->buffer_var});
Stmt free_stmt = IfThenElse(free_op != make_zero(DataType::Int(32)), throw_last_error);
body = SeqStmt({alloca, free_stmt});
body = AttrStmt(op->buffer_var, attr::storage_alignment,
make_const(DataType::Int(32), runtime::kTempAllocaAlignment), body);
return body;
}
Stmt VisitStmt_(const AttrStmtNode* op) final {
if (op->attr_key == attr::device_id) {
ICHECK(!device_id_.defined());
device_id_ = op->value;
return this->VisitStmt(op->body);
} else if (op->attr_key == attr::device_type) {
ICHECK(!device_type_.defined());
device_type_ = op->value;
return this->VisitStmt(op->body);
} else {
return StmtExprMutator::VisitStmt_(op);
}
}
Stmt VisitStmt_(const ForNode* op) final {
PrimExpr min = this->VisitExpr(op->min);
PrimExpr extent = this->VisitExpr(op->extent);
Stmt body;
if (op->kind == ForKind::kParallel) {
body = this->VisitBodyAndRealizeAlloca(op->body);
} else {
body = this->VisitStmt(op->body);
}
if (min.same_as(op->min) && extent.same_as(op->extent) && body.same_as(op->body)) {
return GetRef<Stmt>(op);
} else {
auto n = CopyOnWrite(op);
n->min = std::move(min);
n->extent = std::move(extent);
n->body = std::move(body);
return Stmt(n);
}
}
PrimExpr VisitExpr_(const CallNode* op) final {
if (op->op.same_as(builtin::tvm_call_packed())) {
return MakeCallPacked(op, /* use_string_lookup */ true);
} else if (op->op.same_as(builtin::tvm_call_cpacked())) {
return MakeCallPacked(op, /* use_string_lookup */ false);
} else if (op->op.same_as(builtin::tvm_call_trace_packed())) {
return MakeCallTracePacked(op);
} else if (op->op.same_as(builtin::tvm_stack_make_shape())) {
return MakeShape(op);
} else if (op->op.same_as(builtin::tvm_stack_make_array())) {
return MakeArray(op);
} else if (op->op.same_as(builtin::tvm_context_id())) {
return make_zero(op->dtype);
} else {
return StmtExprMutator::VisitExpr_(op);
}
}
// call shape
PrimExpr MakeShape(const CallNode* op) {
// if args.size() == 0, it represents a scalar shape ()
ICHECK(!alloca_scope_.empty());
auto& scope = alloca_scope_.back();
auto& prep_seq = prep_seq_stack_.back();
if (scope.run_shape_stack == -1) {
scope.run_shape_stack = 0;
}
int64_t stack_begin = scope.run_shape_stack;
scope.run_shape_stack += op->args.size();
PrimExpr expr = StmtExprMutator::VisitExpr_(op);
op = expr.as<CallNode>();
// no need to perform any store for a scalar shape
for (size_t i = 0; i < op->args.size(); ++i) {
prep_seq.emplace_back(Store(scope.stack_shape, cast(DataType::Int(64), op->args[i]),
ConstInt32(stack_begin + i), const_true(1)));
}
return AddressOffset(scope.stack_shape, DataType::Int(64), stack_begin);
}
// make array
PrimExpr MakeArray(const CallNode* op) {
ICHECK(!alloca_scope_.empty());
auto& scope = alloca_scope_.back();
auto& prep_seq = prep_seq_stack_.back();
size_t idx = scope.run_array_stack;
scope.run_array_stack += 1;
PrimExpr expr = StmtExprMutator::VisitExpr_(op);
op = expr.as<CallNode>();
prep_seq.emplace_back(TVMStructSet(scope.stack_array, idx, builtin::kArrData, op->args[0]));
prep_seq.emplace_back(TVMStructSet(scope.stack_array, idx, builtin::kArrShape, op->args[1]));
PrimExpr strides = op->args[2];
if (!strides.defined() || is_zero(strides)) {
strides = make_zero(DataType::Handle());
}
prep_seq.emplace_back(TVMStructSet(scope.stack_array, idx, builtin::kArrStrides, strides));
prep_seq.emplace_back(TVMStructSet(scope.stack_array, idx, builtin::kArrNDim, op->args[3]));
DataType dtype = op->args[4].dtype();
prep_seq.emplace_back(
TVMStructSet(scope.stack_array, idx, builtin::kArrTypeCode,
make_const(DataType::UInt(8), static_cast<int>(dtype.code()))));
prep_seq.emplace_back(TVMStructSet(scope.stack_array, idx, builtin::kArrTypeBits,
make_const(DataType::UInt(8), dtype.bits())));
prep_seq.emplace_back(TVMStructSet(scope.stack_array, idx, builtin::kArrTypeLanes,
make_const(DataType::UInt(16), dtype.lanes())));
// set byte offset
int data_bytes = GetVectorBytes(dtype);
PrimExpr byte_offset = op->args[5];
if (!is_zero(byte_offset)) {
byte_offset = byte_offset * make_const(byte_offset.dtype(), data_bytes);
}
prep_seq.emplace_back(TVMStructSet(scope.stack_array, idx, builtin::kArrByteOffset,
cast(DataType::UInt(64), byte_offset)));
ICHECK(device_type_.defined()) << "Unknown device type in current IR";
ICHECK(device_id_.defined()) << "Unknown device id in current IR";
prep_seq.emplace_back(TVMStructSet(scope.stack_array, idx, builtin::kArrDeviceId,
cast(DataType::Int(32), device_id_)));
prep_seq.emplace_back(TVMStructSet(scope.stack_array, idx, builtin::kArrDeviceType,
cast(DataType::Int(32), device_type_)));
return TVMStructGet(DataType::Handle(), scope.stack_array, idx, builtin::kArrAddr);
}
// call packed.
PrimExpr MakeCallPacked(const CallNode* op, bool use_string_lookup) {
auto& scope = alloca_scope_.back();
auto& prep_seq = prep_seq_stack_.back();
int64_t restore_shape_stack = scope.run_shape_stack;
size_t restore_array_stack = scope.run_array_stack;
size_t arg_stack_begin = scope.run_arg_stack;
scope.run_arg_stack += op->args.size();
// Specially handle the buffer packed intrinsic
PrimExpr expr = StmtExprMutator::VisitExpr_(op);
op = expr.as<CallNode>();
for (size_t i = 1; i < op->args.size(); ++i) {
PrimExpr stack_index = ConstInt32(arg_stack_begin + i - 1);
PrimExpr arg = op->args[i];
DataType t = arg.dtype();
DataType api_type = APIType(t);
if (t != api_type) {
arg = Cast(api_type, arg);
}
prep_seq.emplace_back(TVMStructSet(scope.stack_value,
static_cast<int>(arg_stack_begin + i - 1),
builtin::kTVMValueContent, arg));
int arg_tcode = api_type.code();
if (api_type.is_handle() && arg.as<StringImmNode>()) {
arg_tcode = kTVMStr;
}
if (IsArrayHandle(arg)) arg_tcode = kTVMDLTensorHandle;
prep_seq.emplace_back(
Store(scope.stack_tcode, ConstInt32(arg_tcode), stack_index, const_true(1)));
}
// UPDATE stack value
scope.max_arg_stack = std::max(scope.run_arg_stack, scope.max_arg_stack);
scope.max_shape_stack = std::max(scope.run_shape_stack, scope.max_shape_stack);
scope.max_array_stack = std::max(scope.run_array_stack, scope.max_array_stack);
scope.run_shape_stack = restore_shape_stack;
scope.run_array_stack = restore_array_stack;
scope.run_arg_stack = arg_stack_begin;
Array<PrimExpr> packed_args = {op->args[0], scope.stack_value, scope.stack_tcode,
ConstInt32(arg_stack_begin),
ConstInt32(arg_stack_begin + op->args.size() - 1)};
auto builtin_call = use_string_lookup ? builtin::tvm_call_packed_lowered()
: builtin::tvm_call_cpacked_lowered();
return Call(op->dtype, builtin_call, packed_args);
}
PrimExpr MakeCallTracePacked(const CallNode* op) {
ICHECK(!alloca_scope_.empty());
auto& scope = alloca_scope_.back();
auto& prep_seq = prep_seq_stack_.back();
int64_t restore_shape_stack = scope.run_shape_stack;
size_t restore_array_stack = scope.run_array_stack;
size_t arg_stack_begin = scope.run_arg_stack;
scope.run_arg_stack += op->args.size();
size_t args_size = op->args.size();
ICHECK_GT(args_size, 0);
PrimExpr expr = StmtExprMutator::VisitExpr_(op);
op = expr.as<CallNode>();
for (size_t i = 1; i < op->args.size(); ++i) {
PrimExpr stack_index = ConstInt32(arg_stack_begin + i - 1);
PrimExpr arg = op->args[i];
DataType t = arg.dtype();
DataType api_type = APIType(t);
if (t != api_type) {
arg = Cast(api_type, arg);
}
prep_seq.emplace_back(TVMStructSet(scope.stack_value,
static_cast<int>(arg_stack_begin + i - 1),
builtin::kTVMValueContent, arg));
int arg_tcode = api_type.code();
ICHECK(!IsArrayHandle(arg)) << "Trace does not support Buffers";
prep_seq.emplace_back(
Store(scope.stack_tcode, ConstInt32(arg_tcode), stack_index, const_true(1)));
}
// UPDATE stack value
scope.max_arg_stack = std::max(scope.run_arg_stack, scope.max_arg_stack);
scope.max_shape_stack = std::max(scope.run_shape_stack, scope.max_shape_stack);
scope.max_array_stack = std::max(scope.run_array_stack, scope.max_array_stack);
scope.run_shape_stack = restore_shape_stack;
scope.run_array_stack = restore_array_stack;
// Update the top of the stack, so we can use more than one
// packed function's arguments with the one stack.
scope.run_arg_stack = arg_stack_begin + args_size - 1;
Array<PrimExpr> packed_args = {op->args[0], scope.stack_value, scope.stack_tcode,
ConstInt32(arg_stack_begin),
ConstInt32(arg_stack_begin + op->args.size() - 1),
// Pass traced value.
op->args[args_size - 1]};
return Call(op->dtype, builtin::tvm_call_trace_packed_lowered(), packed_args);
}
Stmt MakeTextureAlloc(const LetStmtNode* let, const CallNode* call) {
ICHECK(device_type_.defined()) << "Unknown device type in current IR";
ICHECK(device_id_.defined()) << "Unknown device id in current IR";
Stmt throw_last_error = Evaluate(Call(DataType::Int(32), builtin::tvm_throw_last_error(), {}));
Stmt body = SeqStmt(
{IfThenElse(Call(DataType::Bool(1), builtin::isnullptr(), {let->var}), throw_last_error),
let->body});
DataType dtype =
let->var->type_annotation.as<PointerTypeNode>()->element_type.as<PrimTypeNode>()->dtype;
std::string fdevapi_prefix = "device_api.";
fdevapi_prefix += runtime::DeviceName(device_type_.as<IntImmNode>()->value);
Call call_packed =
Call(let->var.dtype(), builtin::tvm_call_packed(),
{StringImm(fdevapi_prefix + ".AllocTexture"), cast(DataType::Int(32), device_type_),
cast(DataType::Int(32), device_id_), cast(DataType::UInt(64), call->args[0]),
cast(DataType::UInt(64), call->args[1]), IntImm(DataType::Int(32), dtype.code()),
IntImm(DataType::Int(32), dtype.bits())});
Stmt alloca = LetStmt(let->var, call_packed, body);
Call free_op =
Call(DataType::Int(32), builtin::tvm_call_packed(),
{StringImm(fdevapi_prefix + ".FreeTexture"), cast(DataType::Int(32), device_type_),
cast(DataType::Int(32), device_id_), let->var});
Stmt free_stmt = IfThenElse(free_op != make_zero(DataType::Int(32)), throw_last_error);
body = SeqStmt({alloca, free_stmt});
return body;
}
private:
bool IsArrayHandle(const PrimExpr& arg) {
// specially set array handle.
if (const CallNode* buf = arg.as<CallNode>()) {
if (buf->op.same_as(builtin::tvm_struct_get()) &&
buf->args[2].as<IntImmNode>()->value == builtin::kArrAddr) {
return true;
}
}
return false;
}
// The prepration sequence to be emitted before the current statement.
std::vector<std::vector<Stmt>> prep_seq_stack_;
PrimExpr device_type_;
PrimExpr device_id_;
// Record all stack frames.
std::vector<AllocaScope> alloca_scope_;
};
namespace transform {
Pass LowerTVMBuiltin() {
auto pass_func = [](PrimFunc f, IRModule m, PassContext ctx) {
auto* n = f.CopyOnWrite();
n->body = BuiltinLower().Build(n->body);
return f;
};
return CreatePrimFuncPass(pass_func, 0, "tir.LowerTVMBuiltin", {});
}
TVM_REGISTER_GLOBAL("tir.transform.LowerTVMBuiltin").set_body_typed(LowerTVMBuiltin);
} // namespace transform
} // namespace tir
} // namespace tvm