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codegen_llvm.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.
*/
/*!
* \file codegen_llvm.cc
*/
#ifdef TVM_LLVM_VERSION
// Part of the code are adapted from Halide's CodeGen_LLVM
#include "codegen_llvm.h"
#include <tvm/runtime/c_runtime_api.h>
#include <tvm/runtime/crt/error_codes.h>
#include <tvm/runtime/device_api.h>
#include <tvm/tir/op.h>
#include <algorithm>
#include "../../arith/pattern_match.h"
#include "../build_common.h"
#include "../func_registry_generator.h"
#include "codegen_cpu.h"
#include "codegen_params.h"
#include "llvm/Support/raw_os_ostream.h"
namespace tvm {
namespace codegen {
std::unique_ptr<CodeGenLLVM> CodeGenLLVM::Create(llvm::TargetMachine* tm) {
std::string target = tm->getTarget().getName();
std::string factory_name = "tvm.codegen.llvm.target_" + target;
const PackedFunc* f = runtime::Registry::Get(factory_name);
if (f != nullptr) {
void* handle = (*f)();
return std::unique_ptr<CodeGenLLVM>(static_cast<CodeGenLLVM*>(handle));
} else {
return std::unique_ptr<CodeGenLLVM>(new CodeGenCPU());
}
}
void CodeGenLLVM::Init(const std::string& module_name, llvm::TargetMachine* tm,
llvm::LLVMContext* ctx, bool system_lib, bool dynamic_lookup,
bool target_c_runtime) {
InitializeLLVM();
ctx_ = ctx;
builder_.reset(new IRBuilder(*ctx_));
module_.reset(new llvm::Module(module_name, *ctx_));
md_builder_.reset(new llvm::MDBuilder(*ctx_));
// types
t_void_ = llvm::Type::getVoidTy(*ctx_);
t_void_p_ = llvm::Type::getInt8Ty(*ctx_)->getPointerTo(GetGlobalAddressSpace());
t_int_ = llvm::Type::getInt32Ty(*ctx_);
t_char_ = llvm::Type::getInt8Ty(*ctx_);
t_int8_ = llvm::Type::getInt8Ty(*ctx_);
t_int16_ = llvm::Type::getInt16Ty(*ctx_);
t_int32_ = llvm::Type::getInt32Ty(*ctx_);
t_int64_ = llvm::Type::getInt64Ty(*ctx_);
t_float64_ = llvm::Type::getDoubleTy(*ctx_);
// meta data
md_very_likely_branch_ = md_builder_->createBranchWeights(1 << 20, 1);
md_tbaa_root_ = md_builder_->createTBAARoot("tvm-tbaa");
md_tbaa_alias_set_ = md_builder_->createTBAANode("tvm-alias", md_tbaa_root_);
this->InitTarget(tm);
}
void CodeGenLLVM::InitTarget(llvm::TargetMachine* tm) {
module_->setTargetTriple(tm->getTargetTriple().str());
module_->setDataLayout(tm->createDataLayout());
data_layout_.reset(new llvm::DataLayout(module_.get()));
target_machine_ = tm;
if (native_vector_bits_ == 0) {
const auto& arch = tm->getTargetTriple().getArch();
if (arch == llvm::Triple::x86_64) {
// for avx512
native_vector_bits_ = 512;
} else if (arch == llvm::Triple::x86) {
native_vector_bits_ = 256;
} else if (arch == llvm::Triple::arm || arch == llvm::Triple::aarch64) {
native_vector_bits_ = 128;
} else {
native_vector_bits_ = 128;
std::string arch_name = std::string(tm->getTargetTriple().getArchName());
LOG(WARNING) << "Set native vector bits to be 128 for " << arch_name;
}
}
}
void CodeGenLLVM::AddFunction(const PrimFunc& f) { this->AddFunctionInternal(f, false); }
void CodeGenLLVM::InitFuncState() {
var_map_.clear();
alias_var_set_.clear();
alloc_storage_info_.clear();
volatile_buf_.clear();
analyzer_.reset(new arith::Analyzer());
}
void CodeGenLLVM::AddFunctionInternal(const PrimFunc& f, bool ret_void) {
this->InitFuncState();
ICHECK_EQ(f->buffer_map.size(), 0U)
<< "Cannot codegen function with buffer_map, please lower them first";
std::vector<llvm::Type*> param_types;
is_restricted_ = f->HasNonzeroAttr(tir::attr::kNoAlias);
for (Var param : f->params) {
param_types.push_back(GetLLVMType(param));
if (!is_restricted_ && param.dtype().is_handle()) {
alias_var_set_.insert(param.get());
}
}
// TODO(tvm-team):
// Update the function type to respect the ret_type field of f.
// Once we allow more flexibility in the PrimFunc.
llvm::FunctionType* ftype =
llvm::FunctionType::get(ret_void ? t_void_ : t_int_, param_types, false);
auto global_symbol = f->GetAttr<String>(tvm::attr::kGlobalSymbol);
ICHECK(global_symbol.defined())
<< "CodeGenLLVM: Expect PrimFunc to have the global_symbol attribute";
ICHECK(module_->getFunction(static_cast<std::string>(global_symbol.value())) == nullptr)
<< "Function " << global_symbol << " already exist in module";
function_ = llvm::Function::Create(ftype, llvm::Function::ExternalLinkage,
global_symbol.value().operator std::string(), module_.get());
function_->setCallingConv(llvm::CallingConv::C);
function_->setDLLStorageClass(llvm::GlobalValue::DLLStorageClassTypes::DLLExportStorageClass);
// set var map and align information
auto arg_it = function_->arg_begin();
for (size_t i = 0; i < f->params.size(); ++i, ++arg_it) {
llvm::Argument* v = &(*arg_it);
const Var& var = f->params[i];
var_map_[var.get()] = v;
if (is_restricted_) {
if (var.dtype().is_handle() && !alias_var_set_.count(var.get())) {
// set non alias.
#if TVM_LLVM_VERSION >= 50
function_->addParamAttr(i, llvm::Attribute::NoAlias);
#else
function_->setDoesNotAlias(i + 1);
#endif
}
}
}
llvm::BasicBlock* entry = llvm::BasicBlock::Create(*ctx_, "entry", function_);
builder_->SetInsertPoint(entry);
this->VisitStmt(f->body);
// Add alignment attribute if needed.
#if TVM_LLVM_VERSION >= 50
for (size_t i = 0; i < f->params.size(); ++i) {
const Var& var = f->params[i];
auto f = alloc_storage_info_.find(var.get());
if (f != alloc_storage_info_.end()) {
unsigned align = f->second.alignment;
if (align > 1) {
auto attr = llvm::Attribute::get(*ctx_, llvm::Attribute::Alignment, align);
function_->addParamAttr(i, attr);
}
}
}
#endif
llvm::StringRef fs = target_machine_->getTargetFeatureString();
if (!fs.empty()) {
function_->addFnAttr("target-features", fs);
}
if (ret_void) {
builder_->CreateRetVoid();
} else {
builder_->CreateRet(ConstInt32(0));
}
}
void CodeGenLLVM::LinkParameters(const Map<String, LinkedParam> params) {
// It would be nice to de-dupe these declarations frm src/tir/transforms/make_packed_api.cc,
// but they are at a different layer in the compiler...
llvm::Type* t_int_p = t_int_->getPointerTo(GetGlobalAddressSpace());
// args, tcodes, num_args, ret_value, ret_tcode, resource_handle
std::vector<llvm::Type*> param_types{t_void_p_, t_int_p, t_int_, t_void_p_, t_int_p, t_void_p_};
llvm::FunctionType* ftype = llvm::FunctionType::get(t_int_, param_types, false);
llvm::Function* function =
llvm::Function::Create(ftype, llvm::Function::ExternalLinkage,
::tvm::runtime::symbol::tvm_lookup_linked_param, module_.get());
function->setCallingConv(llvm::CallingConv::C);
function->setDLLStorageClass(llvm::GlobalValue::DLLStorageClassTypes::DLLExportStorageClass);
llvm::BasicBlock* entry = llvm::BasicBlock::Create(*ctx_, "entry", function);
builder_->SetInsertPoint(entry);
auto getArg = [function](int i) -> llvm::Argument* {
#if TVM_LLVM_VERSION >= 100
return function->getArg(i);
#elif TVM_LLVM_VERSION >= 50
return &function->arg_begin()[i];
#else
return &*std::next(function->arg_begin(), i);
#endif
};
llvm::Type* t_int64_p = t_int64_->getPointerTo(GetGlobalAddressSpace());
llvm::Value* sid = builder_->CreateLoad(t_int64_, builder_->CreateBitCast(getArg(0), t_int64_p));
auto ret_tcode = builder_->CreateBitCast(getArg(4), t_int_p);
auto ret_value =
builder_->CreateBitCast(getArg(3), t_void_p_->getPointerTo(GetGlobalAddressSpace()));
llvm::BasicBlock* default_block = llvm::BasicBlock::Create(*ctx_, "default_block", function);
llvm::SwitchInst* switch_inst = builder_->CreateSwitch(sid, default_block, params.size() + 1);
builder_->SetInsertPoint(default_block);
builder_->CreateStore(llvm::ConstantInt::get(t_int_, kTVMNullptr), ret_tcode);
builder_->CreateRet(ConstInt32(kTvmErrorNoError));
// Add data to the global section.
for (auto kv : params) {
auto array = NDArrayToLLVMArray(ctx_, kv.second->param);
std::string symbol_name = std::string(::tvm::runtime::symbol::tvm_param_prefix) + kv.first;
llvm::GlobalVariable* param_symbol = new llvm::GlobalVariable(
*module_, array->getType(), true, llvm::GlobalValue::InternalLinkage, array, symbol_name);
auto dtype = tvm::runtime::DataType(kv.second->param->dtype);
size_t align = std::max(tvm::runtime::GetVectorBytes(dtype), tvm::runtime::kAllocAlignment);
#if TVM_LLVM_VERSION >= 100
param_symbol->setAlignment(llvm::Align(align));
#else
param_symbol->setAlignment(align);
#endif
llvm::BasicBlock* case_block = llvm::BasicBlock::Create(*ctx_, "case_" + symbol_name, function);
switch_inst->addCase(
llvm::cast<llvm::ConstantInt>(llvm::ConstantInt::get(t_int64_, kv.second->id)), case_block);
builder_->SetInsertPoint(case_block);
builder_->CreateStore(builder_->CreatePointerCast(param_symbol, t_void_p_), ret_value);
builder_->CreateStore(llvm::ConstantInt::get(t_int_, kTVMOpaqueHandle), ret_tcode);
builder_->CreateRet(ConstInt32(0));
}
}
std::unique_ptr<llvm::Module> CodeGenLLVM::Finish() {
this->AddStartupFunction();
for (size_t i = 0; i < link_modules_.size(); ++i) {
ICHECK(!llvm::Linker::linkModules(*module_, std::move(link_modules_[i])))
<< "Failed to link modules";
}
link_modules_.clear();
// optimize
this->Optimize();
return std::move(module_);
}
void CodeGenLLVM::HandleImport(const std::string& code) {
std::unique_ptr<llvm::Module> mlib;
llvm::SMDiagnostic err;
if (code.length() >= 3 &&
(code.substr(code.length() - 3) == ".ll" || code.substr(code.length() - 3) == ".bc")) {
mlib = llvm::parseIRFile(code, err, *ctx_);
if (mlib.get() == nullptr) {
std::string msg = std::string(err.getMessage());
LOG(FATAL) << "Fail to load bitcode file " << code << "\n"
<< "line " << err.getLineNo() << ":" << msg;
}
} else {
std::unique_ptr<llvm::MemoryBuffer> buf = llvm::MemoryBuffer::getMemBuffer(code);
mlib = llvm::parseIR(*buf, err, *ctx_);
if (mlib.get() == nullptr) {
std::string msg = std::string(err.getMessage());
LOG(FATAL) << "Fail to load llvm ir "
<< "line " << err.getLineNo() << ":" << msg << "\ncontent:\n"
<< code;
}
}
mlib->setTargetTriple(target_machine_->getTargetTriple().str());
mlib->setDataLayout(target_machine_->createDataLayout());
// mark all the functions as force inline
for (llvm::Function& f : mlib->functions()) {
f.removeFnAttr(llvm::Attribute::NoInline);
f.addFnAttr(llvm::Attribute::AlwaysInline);
f.setLinkage(llvm::GlobalValue::AvailableExternallyLinkage);
}
// add to linker libraries.
this->AddLinkModule(std::move(mlib));
}
void CodeGenLLVM::AddLinkModule(std::unique_ptr<llvm::Module>&& mod) {
link_modules_.emplace_back(std::move(mod));
}
void CodeGenLLVM::AddMainFunction(const std::string& entry_func_name) {
LOG(FATAL) << "not implemented";
}
llvm::Value* CodeGenLLVM::GetThreadIndex(const IterVar& iv) {
LOG(FATAL) << "not implemented";
return nullptr;
}
llvm::Value* CodeGenLLVM::CreateStorageSync(const CallNode* op) {
LOG(FATAL) << "not implemented";
return nullptr;
}
class FPassManager : public llvm::legacy::FunctionPassManager {
public:
explicit FPassManager(llvm::Module* m) : llvm::legacy::FunctionPassManager(m) {}
// override add to allow messaging
void add(llvm::Pass* p) final { llvm::legacy::FunctionPassManager::add(p); }
};
class MPassManager : public llvm::legacy::PassManager {
public:
// override add to allow messaging
void add(llvm::Pass* p) final { llvm::legacy::PassManager::add(p); }
};
void CodeGenLLVM::InitPassManagerBuilder(llvm::PassManagerBuilder* builder) {}
void CodeGenLLVM::Optimize() {
// pass manager
FPassManager fpass(module_.get());
MPassManager mpass;
mpass.add(llvm::createTargetTransformInfoWrapperPass(
target_machine_ ? target_machine_->getTargetIRAnalysis() : llvm::TargetIRAnalysis()));
fpass.add(llvm::createTargetTransformInfoWrapperPass(
target_machine_ ? target_machine_->getTargetIRAnalysis() : llvm::TargetIRAnalysis()));
// place optimization pass
llvm::PassManagerBuilder builder;
builder.OptLevel = 3;
#if TVM_LLVM_VERSION >= 50
builder.Inliner = llvm::createFunctionInliningPass(builder.OptLevel, 0, false);
#else
builder.Inliner = llvm::createFunctionInliningPass(builder.OptLevel, 0);
#endif
builder.LoopVectorize = true;
builder.SLPVectorize = true;
this->InitPassManagerBuilder(&builder);
#if TVM_LLVM_VERSION >= 50
target_machine_->adjustPassManager(builder);
#endif
builder.populateFunctionPassManager(fpass);
builder.populateModulePassManager(mpass);
fpass.doInitialization();
for (auto it = module_->begin(); it != module_->end(); ++it) {
fpass.run(*it);
}
fpass.doFinalization();
mpass.run(*module_);
}
int CodeGenLLVM::NativeVectorBits(const runtime::StorageScope& storage_scope) const {
return native_vector_bits_;
}
unsigned CodeGenLLVM::GetGlobalAddressSpace() const { return 0; }
llvm::Type* CodeGenLLVM::DTypeToLLVMType(const DataType& dtype) const {
if (dtype.is_handle()) {
ICHECK_EQ(dtype.lanes(), 1);
return t_void_p_;
}
if (dtype.is_void()) {
return t_void_;
}
llvm::Type* etype = nullptr;
if (dtype.is_int() || dtype.is_uint()) {
etype = llvm::Type::getIntNTy(*ctx_, dtype.bits());
} else if (dtype.is_float()) {
switch (dtype.bits()) {
case 16:
etype = llvm::Type::getHalfTy(*ctx_);
break;
case 32:
etype = llvm::Type::getFloatTy(*ctx_);
break;
case 64:
etype = llvm::Type::getDoubleTy(*ctx_);
break;
default:
LOG(FATAL) << "do not support " << dtype;
}
}
if (dtype.lanes() != 1) {
#if TVM_LLVM_VERSION >= 110
return llvm::FixedVectorType::get(etype, dtype.lanes());
#else
return llvm::VectorType::get(etype, dtype.lanes());
#endif
} else {
return etype;
}
}
llvm::Type* CodeGenLLVM::GetLLVMType(const Type& type) const {
if (auto* ptr = type.as<PrimTypeNode>()) {
return DTypeToLLVMType(ptr->dtype);
} else if (auto* ptr = type.as<PointerTypeNode>()) {
// TODO(tvm-team) consider put storage scope into the pointer type.
return GetLLVMType(ptr->element_type)->getPointerTo(GetGlobalAddressSpace());
} else if (IsVoidType(type)) {
return t_void_;
} else {
LOG(FATAL) << "Type " << type << " does not have a corresponding LLVM Type";
return t_void_;
}
}
llvm::Type* CodeGenLLVM::GetLLVMType(const PrimExpr& expr) const {
return GetLLVMType(GetType(expr));
}
// Add tbaa alias information for load
//
// use a binary tree typed system to declare information
// and allow alias to be distinguished across nodes.
//
// This trick comes from Halide's CodeGen_LLVM
//
void CodeGenLLVM::AddAliasInfo(llvm::Instruction* inst, const VarNode* buffer, PrimExpr index) {
if (alias_var_set_.count(buffer) != 0) {
// Mark all possibly aliased pointer as same type.
llvm::MDNode* meta = md_tbaa_alias_set_;
inst->setMetadata("tbaa", md_builder_->createTBAAStructTagNode(meta, meta, 0));
return;
}
int64_t base = 0, width = 0;
arith::PVar<IntImm> pbase, pstride;
arith::PVar<int> planes;
// create meta-data for alias analysis
// Use a group of binary tree ranges of memory banks.
if (index.defined()) {
if (arith::ramp(pbase, pstride, planes).Match(index)) {
base = pbase.Eval()->value;
int64_t xwith = planes.Eval() * pstride.Eval()->value;
width = 1;
while (width < xwith) {
width *= 2;
}
while (base % width) {
base -= base % width;
width *= 2;
}
} else if (auto* ptr = index.as<tir::IntImmNode>()) {
width = 1;
base = ptr->value;
}
}
llvm::MDNode* meta = md_tbaa_root_;
std::ostringstream buffer_addr;
buffer_addr << buffer;
meta = md_builder_->createTBAAScalarTypeNode(buffer_addr.str(), meta);
// Extract the underlying type of the allocated buffer.
DataType dtype = buffer->dtype;
if (buffer->type_annotation.defined()) {
Type element_type = Downcast<PointerType>(buffer->type_annotation)->element_type;
if (auto* ptype = element_type.as<PrimTypeNode>()) {
dtype = ptype->dtype;
}
}
llvm::Type* buf_type = DTypeToLLVMType(dtype);
if (!buf_type) {
buf_type = t_void_p_;
}
std::string tmp;
llvm::raw_string_ostream buffer_type(tmp);
buffer_type << *buf_type;
meta = md_builder_->createTBAAScalarTypeNode(buffer_type.str(), meta);
// create a tree-shape access structure.
if (width != 0) {
for (int64_t w = 1024; w >= width; w /= 2) {
int64_t b = (base / w) * w;
std::stringstream os;
os << buffer << ".w" << w << ".b" << b;
meta = md_builder_->createTBAAScalarTypeNode(os.str(), meta);
}
}
inst->setMetadata("tbaa", md_builder_->createTBAAStructTagNode(meta, meta, 0));
}
void CodeGenLLVM::GetAlignment(DataType t, const VarNode* buf_var, const PrimExpr& index,
int* p_alignment, int* p_native_bits) {
int max_align_bits = t.bits();
auto it = alloc_storage_info_.find(buf_var);
if (it != alloc_storage_info_.end()) {
const StorageInfo& info = it->second;
*p_native_bits =
NativeVectorBits(runtime::StorageScope::Create(GetPtrStorageScope(GetRef<Var>(buf_var))));
max_align_bits = info.alignment * 8;
} else {
*p_native_bits = native_vector_bits_;
}
arith::ModularSet me = analyzer_->modular_set(index);
int64_t base = me->base;
int64_t coeff = me->coeff;
int align_bits = t.bits();
while (align_bits < max_align_bits && base % 2 == 0 && coeff % 2 == 0) {
base = base / 2;
coeff = coeff / 2;
align_bits *= 2;
}
if (align_bits < 8) {
align_bits = 8;
}
*p_alignment = align_bits / 8;
}
llvm::GlobalVariable* CodeGenLLVM::AllocateSharedMemory(DataType dtype, size_t size,
unsigned int shared_address_space,
int alignment,
llvm::GlobalValue::LinkageTypes linkage) {
llvm::Type* type = llvm::ArrayType::get(DTypeToLLVMType(dtype), size);
llvm::GlobalVariable* global =
new llvm::GlobalVariable(*module_, type, false, linkage, nullptr, "shmem", nullptr,
llvm::GlobalValue::NotThreadLocal, shared_address_space);
#if TVM_LLVM_VERSION >= 100
global->setAlignment(llvm::Align(alignment));
#else
global->setAlignment(alignment);
#endif
return global;
}
std::unique_ptr<CodeGenLLVM::DebugInfo> CodeGenLLVM::CreateDebugInfo(llvm::Module* module) {
#if TVM_LLVM_VERSION >= 100
auto debug_info = std::make_unique<CodeGenLLVM::DebugInfo>();
debug_info->di_builder_ = std::make_unique<llvm::DIBuilder>(*module);
#else
auto debug_info = llvm::make_unique<CodeGenLLVM::DebugInfo>();
debug_info->di_builder_ = llvm::make_unique<llvm::DIBuilder>(*module);
#endif
// TODO(tulloch): pass this information through relay::Span classes to the IRModule instance?
debug_info->file_ = debug_info->di_builder_->createFile("model.tvm", "/tmp/");
debug_info->compilation_unit_ = debug_info->di_builder_->createCompileUnit(
llvm::dwarf::DW_LANG_C, debug_info->file_, "TVM", 0, "", 0, "",
llvm::DICompileUnit::DebugEmissionKind::FullDebug,
/* SplitDebugInlining */ true,
/* DebugInfoForProfiling */ true);
return debug_info;
}
llvm::Value* CodeGenLLVM::CreateBroadcast(llvm::Value* value, int lanes) {
#if TVM_LLVM_VERSION >= 110
llvm::Type* type = llvm::FixedVectorType::get(value->getType(), lanes);
#else
llvm::Type* type = llvm::VectorType::get(value->getType(), lanes);
#endif
llvm::Constant* undef = llvm::UndefValue::get(type);
llvm::Constant* zero = ConstInt32(0);
value = builder_->CreateInsertElement(undef, value, zero);
#if TVM_LLVM_VERSION >= 120
llvm::Constant* mask = llvm::ConstantVector::getSplat(llvm::ElementCount::getFixed(lanes), zero);
#elif TVM_LLVM_VERSION >= 110
llvm::Constant* mask =
llvm::ConstantVector::getSplat(llvm::ElementCount(lanes, /*Scalable=*/false), zero);
#else
llvm::Constant* mask = llvm::ConstantVector::getSplat(lanes, zero);
#endif
return builder_->CreateShuffleVector(value, undef, mask);
}
llvm::Value* CodeGenLLVM::CreateVecSlice(llvm::Value* vec, int begin, int extent) {
int num_elems = GetVectorNumElements(vec);
if (extent == num_elems && begin == 0) return vec;
ICHECK(begin >= 0 && extent <= num_elems) << "Slicing out of bound!\n";
std::vector<llvm::Constant*> indices;
indices.reserve(extent);
for (int i = 0; i < extent; ++i) {
if (begin + i >= 0 && begin + i < num_elems) {
indices.push_back(llvm::ConstantInt::get(t_int32_, begin + i));
} else {
indices.push_back(llvm::UndefValue::get(t_int32_));
}
}
return builder_->CreateShuffleVector(vec, vec, llvm::ConstantVector::get(indices));
}
llvm::Value* CodeGenLLVM::CreateVecFlip(llvm::Value* vec) {
int num_elems = GetVectorNumElements(vec);
#if TVM_LLVM_VERSION >= 110
std::vector<int> indices;
#else
std::vector<unsigned> indices;
#endif
for (int i = 0; i < num_elems; ++i) {
indices.push_back(num_elems - i - 1);
}
return builder_->CreateShuffleVector(vec, vec, indices);
}
llvm::Value* CodeGenLLVM::CreateVecPad(llvm::Value* vec, int target_lanes) {
llvm::Value* mask = llvm::UndefValue::get(DTypeToLLVMType(DataType::Int(32, target_lanes)));
int num_elems = GetVectorNumElements(vec);
if (num_elems == target_lanes) return vec;
ICHECK_LT(num_elems, target_lanes);
for (int i = 0; i < num_elems; ++i) {
mask = builder_->CreateInsertElement(mask, ConstInt32(i), ConstInt32(i));
}
return builder_->CreateShuffleVector(vec, vec, mask);
}
llvm::Value* CodeGenLLVM::CreateVecConcat(std::vector<llvm::Value*> vecs) {
// To allow creating vectors from scalars, convert any scalars in "vecs" to single-lane
// LLVM vector types.
for (size_t i = 0, e = vecs.size(); i != e; ++i) {
llvm::Value* v = vecs[i];
if (!v->getType()->isVectorTy()) {
#if TVM_LLVM_VERSION >= 110
llvm::Type* vec_ty = llvm::FixedVectorType::get(v->getType(), 1);
#else
llvm::Type* vec_ty = llvm::VectorType::get(v->getType(), 1);
#endif
vecs[i] = builder_->CreateInsertElement(llvm::UndefValue::get(vec_ty), v, ConstInt32(0));
}
}
// concat vector, tree shape reduction
int total_lanes = 0;
for (llvm::Value* v : vecs) {
total_lanes += GetVectorNumElements(v);
}
while (vecs.size() > 1) {
std::vector<llvm::Value*> new_vecs;
for (size_t i = 0; i < vecs.size() - 1; i += 2) {
llvm::Value* lhs = vecs[i];
llvm::Value* rhs = vecs[i + 1];
const size_t lhs_lanes = GetVectorNumElements(lhs);
const size_t rhs_lanes = GetVectorNumElements(rhs);
if (lhs_lanes < rhs_lanes) {
lhs = CreateVecPad(lhs, rhs_lanes);
} else if (rhs_lanes < lhs_lanes) {
rhs = CreateVecPad(rhs, lhs_lanes);
}
const size_t shared_lanes = std::max(lhs_lanes, rhs_lanes);
#if TVM_LLVM_VERSION >= 110
std::vector<int> mask;
#else
std::vector<unsigned> mask;
#endif
for (size_t i = 0; i < lhs_lanes; ++i) {
mask.push_back(i);
}
for (size_t i = 0; i < rhs_lanes; ++i) {
mask.push_back(shared_lanes + i);
}
new_vecs.push_back(builder_->CreateShuffleVector(lhs, rhs, mask));
}
if (vecs.size() % 2 != 0) {
new_vecs.push_back(vecs.back());
}
vecs.swap(new_vecs);
}
return CreateVecSlice(vecs[0], 0, total_lanes);
}
void CodeGenLLVM::CreateSerialFor(llvm::Value* begin, llvm::Value* end, llvm::Value* stride,
const Var& loop_var, const Stmt& body) {
using llvm::BasicBlock;
BasicBlock* pre_block = builder_->GetInsertBlock();
BasicBlock* for_begin = BasicBlock::Create(*ctx_, "for_begin", function_);
BasicBlock* for_body = BasicBlock::Create(*ctx_, "for_body", function_);
BasicBlock* for_end = BasicBlock::Create(*ctx_, "for_end", function_);
builder_->CreateBr(for_begin);
builder_->SetInsertPoint(for_begin);
llvm::PHINode* loop_value = builder_->CreatePHI(begin->getType(), 2);
loop_value->addIncoming(begin, pre_block);
ICHECK(!var_map_.count(loop_var.get()));
var_map_[loop_var.get()] = loop_value;
builder_->CreateCondBr(CreateLT(loop_var.dtype(), loop_value, end), for_body, for_end,
md_very_likely_branch_);
builder_->SetInsertPoint(for_body);
this->VisitStmt(body);
var_map_.erase(loop_var.get());
llvm::Value* loop_next = CreateAdd(loop_var.dtype(), loop_value, stride);
loop_value->addIncoming(loop_next, builder_->GetInsertBlock());
builder_->CreateBr(for_begin);
builder_->SetInsertPoint(for_end);
}
// cast operatpr
llvm::Value* CodeGenLLVM::CreateCast(DataType from, DataType to, llvm::Value* value) {
llvm::Type* target = DTypeToLLVMType(to);
if (value->getType() == target) return value;
if (to.is_handle()) {
return builder_->CreateBitCast(value, target);
} else if (to.is_uint() && to.bits() == 1) {
if (from.is_float()) {
llvm::Constant* zero = llvm::ConstantFP::get(DTypeToLLVMType(from), 0.);
return builder_->CreateFCmpONE(value, zero);
} else {
llvm::Constant* zero = llvm::ConstantInt::get(DTypeToLLVMType(from), 0);
return builder_->CreateICmpNE(value, zero);
}
} else if (!from.is_float() && !to.is_float()) {
return builder_->CreateIntCast(value, target, from.is_int());
} else if (from.is_float() && to.is_int()) {
return builder_->CreateFPToSI(value, target);
} else if (from.is_float() && to.is_uint()) {
if (to.bits() < 8) {
value = builder_->CreateFPToUI(value, DTypeToLLVMType(to.with_bits(8)));
return builder_->CreateIntCast(value, target, false);
} else {
return builder_->CreateFPToUI(value, target);
}
} else if (from.is_int() && to.is_float()) {
return builder_->CreateSIToFP(value, target);
} else if (from.is_uint() && to.is_float()) {
return builder_->CreateUIToFP(value, target);
} else {
ICHECK(from.is_float() && to.is_float());
return builder_->CreateFPCast(value, target);
}
}
llvm::Constant* CodeGenLLVM::GetConstString(const std::string& str) {
auto it = str_map_.find(str);
if (it != str_map_.end()) return it->second;
llvm::Type* type = llvm::ArrayType::get(t_char_, str.length() + 1);
llvm::GlobalVariable* global = new llvm::GlobalVariable(
*module_, type, true, llvm::GlobalValue::PrivateLinkage, nullptr, ".str");
#if TVM_LLVM_VERSION >= 100
global->setAlignment(llvm::Align(1));
#else
global->setAlignment(1);
#endif
global->setInitializer(llvm::ConstantDataArray::getString(*ctx_, str));
llvm::Constant* zero = ConstInt32(0);
llvm::Constant* indices[] = {zero, zero};
llvm::Constant* ptr = llvm::ConstantExpr::getGetElementPtr(type, global, indices);
str_map_[str] = ptr;
return ptr;
}
CodeGenLLVM::TypedPointer CodeGenLLVM::CreateBufferPtr(DataType t, llvm::Value* buffer,
llvm::Value* index) {
llvm::PointerType* btype = llvm::dyn_cast<llvm::PointerType>(buffer->getType());
ICHECK(btype != nullptr);
llvm::Type* llvm_type = DTypeToLLVMType(t);
llvm::PointerType* ttype = llvm_type->getPointerTo(btype->getAddressSpace());
if (btype != ttype) {
buffer = builder_->CreatePointerCast(buffer, ttype);
}
llvm::Value* ptr = builder_->CreateInBoundsGEP(llvm_type, buffer, index);
return TypedPointer(llvm_type, ptr);
}
llvm::Value* CodeGenLLVM::GetVarValue(const VarNode* v) const {
auto it = var_map_.find(v);
ICHECK(it != var_map_.end()) << "cannot find variable " << v->name_hint;
return it->second;
}
llvm::Value* CodeGenLLVM::CreateCallExtern(Type ret_type, String global_symbol,
const Array<PrimExpr>& args, bool skip_first_arg) {
std::vector<llvm::Value*> arg_value;
std::vector<llvm::Type*> arg_type;
for (size_t i = static_cast<size_t>(skip_first_arg); i < args.size(); ++i) {
arg_value.push_back(MakeValue(args[i]));
arg_type.push_back(arg_value.back()->getType());
}
llvm::FunctionType* ftype = llvm::FunctionType::get(GetLLVMType(ret_type), arg_type, false);
llvm::Function* f = module_->getFunction(global_symbol);
if (f == nullptr) {
f = llvm::Function::Create(ftype, llvm::Function::ExternalLinkage,
global_symbol.operator llvm::StringRef(), module_.get());
}
llvm::CallInst* call = builder_->CreateCall(f, arg_value);
return call;
}
llvm::Function* CodeGenLLVM::GetIntrinsicDecl(llvm::Intrinsic::ID id, llvm::Type* ret_type,
llvm::ArrayRef<llvm::Type*> arg_types) {
llvm::Module* module = module_.get();
if (!llvm::Intrinsic::isOverloaded(id)) {
return llvm::Intrinsic::getDeclaration(module, id, {});
}
llvm::SmallVector<llvm::Intrinsic::IITDescriptor, 4> infos;
llvm::Intrinsic::getIntrinsicInfoTableEntries(id, infos);
llvm::SmallVector<llvm::Type*, 4> overload_types;
#if TVM_LLVM_VERSION >= 90
auto try_match = [&](llvm::FunctionType* f_ty, bool var_arg) {
overload_types.clear();
llvm::ArrayRef<llvm::Intrinsic::IITDescriptor> ref(infos);
auto match = llvm::Intrinsic::matchIntrinsicSignature(f_ty, ref, overload_types);
if (match == llvm::Intrinsic::MatchIntrinsicTypes_Match) {
bool error = llvm::Intrinsic::matchIntrinsicVarArg(var_arg, ref);
if (error) {
return llvm::Intrinsic::MatchIntrinsicTypes_NoMatchArg;
}
}
return match;
};
// First, try matching the signature assuming non-vararg case.
auto* fn_ty = llvm::FunctionType::get(ret_type, arg_types, false);
switch (try_match(fn_ty, false)) {
case llvm::Intrinsic::MatchIntrinsicTypes_NoMatchRet:
// The return type doesn't match, there is nothing else to do.
return nullptr;
case llvm::Intrinsic::MatchIntrinsicTypes_Match:
return llvm::Intrinsic::getDeclaration(module, id, overload_types);
case llvm::Intrinsic::MatchIntrinsicTypes_NoMatchArg:
break;
}
// Keep adding one type at a time (starting from empty list), and
// try matching the vararg signature.
llvm::SmallVector<llvm::Type*, 4> var_types;
for (int i = 0, e = arg_types.size(); i <= e; ++i) {
if (i > 0) var_types.push_back(arg_types[i - 1]);
auto* ft = llvm::FunctionType::get(ret_type, var_types, true);
if (try_match(ft, true) == llvm::Intrinsic::MatchIntrinsicTypes_Match) {
return llvm::Intrinsic::getDeclaration(module, id, overload_types);
}
}
// Failed to identify the type.
return nullptr;
#else // TVM_LLVM_VERSION
llvm::ArrayRef<llvm::Intrinsic::IITDescriptor> ref(infos);
// matchIntrinsicType returns true on error.
if (llvm::Intrinsic::matchIntrinsicType(ret_type, ref, overload_types)) {
return nullptr;
}
for (llvm::Type* t : arg_types) {
if (llvm::Intrinsic::matchIntrinsicType(t, ref, overload_types)) {
return nullptr;
}
}
return llvm::Intrinsic::getDeclaration(module, id, overload_types);
#endif // TVM_LLVM_VERSION
}
llvm::Value* CodeGenLLVM::CreateIntrinsic(const CallNode* op) {
if (op->op.same_as(builtin_call_llvm_intrin_) || op->op.same_as(builtin_call_llvm_pure_intrin_)) {
ICHECK_GE(op->args.size(), 2U);
llvm::Intrinsic::ID id = static_cast<llvm::Intrinsic::ID>(Downcast<IntImm>(op->args[0])->value);
int64_t num_signature = Downcast<IntImm>(op->args[1])->value;
std::vector<llvm::Value*> arg_value;
std::vector<llvm::Type*> arg_type;
for (size_t i = 2; i < op->args.size(); ++i) {
arg_value.push_back(MakeValue(op->args[i]));
if (i - 2 < static_cast<size_t>(num_signature)) {
arg_type.push_back(arg_value.back()->getType());
}
}
// LLVM's prefetch intrinsic returns "void", while TVM's prefetch
// returns int32. This causes problems because prefetch is one of
// those intrinsics that is generated automatically via the
// tvm.intrin.rule mechanism. Any other intrinsic with a type
// mismatch will have to be treated specially here.
// TODO(kparzysz-quic): fix this once TVM prefetch uses the same
// type as LLVM.
llvm::Type* return_type = (id != llvm::Intrinsic::prefetch) ? GetLLVMType(GetRef<PrimExpr>(op))
: llvm::Type::getVoidTy(*ctx_);
llvm::Function* f = GetIntrinsicDecl(id, return_type, arg_type);
ICHECK(f) << "Cannot find intrinsic declaration, possible type mismatch: "
#if TVM_LLVM_VERSION >= 130
<< llvm::Intrinsic::getBaseName(id).str();
#else
<< llvm::Intrinsic::getName(id, {});
#endif
return builder_->CreateCall(f, arg_value);
} else if (op->op.same_as(builtin::bitwise_and())) {
return builder_->CreateAnd(MakeValue(op->args[0]), MakeValue(op->args[1]));
} else if (op->op.same_as(builtin::bitwise_or())) {
return builder_->CreateOr(MakeValue(op->args[0]), MakeValue(op->args[1]));
} else if (op->op.same_as(builtin::bitwise_not())) {
return builder_->CreateNot(MakeValue(op->args[0]));
} else if (op->op.same_as(builtin::bitwise_xor())) {
return builder_->CreateXor(MakeValue(op->args[0]), MakeValue(op->args[1]));
} else if (op->op.same_as(builtin::shift_left())) {
return builder_->CreateShl(MakeValue(op->args[0]), MakeValue(op->args[1]));
} else if (op->op.same_as(builtin::shift_right())) {
if (op->args[0].dtype().is_int()) {
return builder_->CreateAShr(MakeValue(op->args[0]), MakeValue(op->args[1]));
} else {
return builder_->CreateLShr(MakeValue(op->args[0]), MakeValue(op->args[1]));
}
} else if (op->op.same_as(builtin::tvm_storage_sync())) {
return CreateStorageSync(op);
} else if (op->op.same_as(builtin::address_of())) {
const LoadNode* l = op->args[0].as<LoadNode>();
ICHECK(op->args.size() == 1 && l);
TypedPointer buffer_ptr;
if (const RampNode* r = l->index.as<RampNode>()) {
PrimExpr index = r->base / make_const(DataType::Int(32), r->lanes);
buffer_ptr = CreateBufferPtr(l->dtype, MakeValue(l->buffer_var), MakeValue(index));
} else {
buffer_ptr = CreateBufferPtr(l->dtype, MakeValue(l->buffer_var), MakeValue(l->index));
}
unsigned addrspace =
llvm::dyn_cast<llvm::PointerType>(buffer_ptr.addr->getType())->getAddressSpace();
return builder_->CreatePointerCast(buffer_ptr.addr, t_char_->getPointerTo(addrspace));
} else if (op->op.same_as(builtin::reinterpret()) && is_zero(op->args[0])) {
return llvm::Constant::getNullValue(t_void_p_);
} else if (op->op.same_as(builtin::isnullptr())) {
return builder_->CreateIsNull(MakeValue(op->args[0]));
} else if (op->op.same_as(builtin::large_uint_imm())) {
ICHECK_EQ(op->args.size(), 2U);
uint64_t low = static_cast<uint64_t>(Downcast<IntImm>(op->args[0])->value);
uint64_t high = static_cast<uint64_t>(Downcast<IntImm>(op->args[1])->value);
uint64_t val = (high << 32U) | low;
return llvm::ConstantInt::get(DTypeToLLVMType(op->dtype), val);
} else if (op->op.same_as(builtin::if_then_else())) {
ICHECK_EQ(op->args[0].dtype().lanes(), 1) << "if_then_else can only take scalar condition";
using llvm::BasicBlock;
BasicBlock* then_block = BasicBlock::Create(*ctx_, "if_then", function_);
BasicBlock* else_block = BasicBlock::Create(*ctx_, "if_else", function_);
BasicBlock* end_block = BasicBlock::Create(*ctx_, "if_end", function_);
builder_->CreateCondBr(MakeValue(op->args[0]), then_block, else_block);
builder_->SetInsertPoint(then_block);
llvm::Value* then_value = MakeValue(op->args[1]);
BasicBlock* then_value_block = builder_->GetInsertBlock();
builder_->CreateBr(end_block);
builder_->SetInsertPoint(else_block);
llvm::Value* else_value = MakeValue(op->args[2]);
BasicBlock* else_value_block = builder_->GetInsertBlock();
builder_->CreateBr(end_block);
builder_->SetInsertPoint(end_block);
llvm::PHINode* value = builder_->CreatePHI(then_value->getType(), 2);
value->addIncoming(then_value, then_value_block);
value->addIncoming(else_value, else_value_block);
return value;
} else if (op->op.same_as(builtin::ret())) {
auto const* val = op->args[0].as<IntImmNode>();
ICHECK(val) << "the tir.ret should be transformed to return zero "
<< "before the llvm code generation.";
ICHECK_EQ(val->value, 0) << "the tir.ret should be transformed to "
<< "return zero before the llvm code generation.";
builder_->CreateRet(ConstInt32(0));
// LLVM allows exactly one terminator in a single basic block
// append a new dummy basic block to avoid error.
llvm::BasicBlock* ret_dummy = llvm::BasicBlock::Create(*ctx_, "ret_dummy", function_);
builder_->SetInsertPoint(ret_dummy);
return ret_dummy;
} else if (op->op.same_as(builtin::reinterpret())) {
llvm::Type* target = DTypeToLLVMType(op->dtype);
return builder_->CreateBitCast(MakeValue(op->args[0]), target);
} else if (op->op.same_as(builtin::isnan())) {
// TODO(hgt312): set fast math flag
llvm::Value* a = MakeValue(op->args[0]);
return builder_->CreateFCmpUNO(a, a);
} else if (op->op.same_as(builtin::vectorlow())) {
llvm::Value* v = MakeValue(op->args[0]);
int l = GetVectorNumElements(v);
return CreateVecSlice(v, 0, l / 2);
} else if (op->op.same_as(builtin::vectorhigh())) {
llvm::Value* v = MakeValue(op->args[0]);
int l = GetVectorNumElements(v);
return CreateVecSlice(v, l / 2, l / 2);
} else if (op->op.same_as(builtin::vectorcombine())) {
llvm::Value* v0 = MakeValue(op->args[0]);
llvm::Value* v1 = MakeValue(op->args[1]);
int num_elems = GetVectorNumElements(v0) * 2;
#if TVM_LLVM_VERSION >= 110
std::vector<int> indices;
#else
std::vector<unsigned> indices;
#endif
for (int i = 0; i < num_elems; ++i) {
indices.push_back(i);
}
return builder_->CreateShuffleVector(v0, v1, indices);
} else if (op->op.same_as(builtin::atomic_add())) {
// TODO(masahi): Support atomic for CPU backend
LOG(FATAL) << "CPU backend does not support atomic add yet.";
return nullptr;
} else {
LOG(FATAL) << "unknown intrinsic " << op->op;