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daa828ec18baf3e8a89d2cb8b63257e519eb75da
triton/lib/codegen/selection.cpp
Philippe Tillet daa828ec18 [general] rename namespace tdl -> triton
2019-02-24 14:35:16 -05:00

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#include "triton/codegen/selection.h"
#include "triton/codegen/tune.h"
#include "triton/codegen/allocation.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/IRBuilder.h"
#include "triton/ir/context.h"
#include "triton/ir/module.h"
#include "triton/ir/function.h"
#include "triton/ir/type.h"
#include "llvm/Transforms/Scalar/EarlyCSE.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/IR/BasicBlock.h"
namespace triton{
namespace codegen{
using namespace llvm;
/* Distributed Tile */
void distributed_tile::init_indices() {
std::vector<size_t> id(axes_.size(), 0);
size_t k = 0;
while(true) {
indices_t current;
for(size_t d = 0; d < id.size(); d++)
current.push_back(axes_[d].values[id[d]]);
indices_[current] = indices_.size();
id[0]++;
while(id[k] == axes_[k].values.size()){
if(k == id.size() - 1)
return;
id[k++] = 0;
id[k]++;
}
k = 0;
}
}
llvm::Type *distributed_tile::make_vector_ty(llvm::Type *ty, size_t vector_size) {
if(vector_size == 1)
return ty;
return VectorType::get(ty, vector_size);
}
distributed_tile::distributed_tile(Type *ty, const shapes_t &shapes, const axes_t &axes, llvm::IRBuilder<> &builder, bool vectorize)
: tile(make_vector_ty(ty, vectorize?axes[0].contiguous:1), shapes), axes_(axes), builder_(builder) {
vector_size_ = vectorize?ty_->getVectorNumElements():1;
init_indices();
for(size_t i = 0; i < indices_.size(); i++)
values_.push_back(UndefValue::get(ty_));
}
void distributed_tile::set_value(indices_t idx, Value *v) {
values_[indices_[idx]] = v;
}
Value* distributed_tile::get_value(indices_t idx) {
return values_[indices_[idx]];
}
unsigned distributed_tile::get_linear_index(indices_t idx) {
return indices_[idx];
}
void distributed_tile::for_each(std::function<void (indices_t)> fn) {
for(auto &idx: indices_)
if(idx.second % vector_size_ == 0)
fn(idx.first);
}
/* Shared Tile */
void shared_tile::extract_constant(Value *arg, Value *&non_cst, Value *&cst) {
BinaryOperator *bin_op = dyn_cast<BinaryOperator>(arg);
Constant *_0 = ConstantInt::get(Type::getInt32Ty(arg->getContext()), 0);
if(dyn_cast<Constant>(arg)){
cst = arg;
non_cst = _0;
return;
}
if(!bin_op || bin_op->getOpcode() != llvm::BinaryOperator::Add){
non_cst = arg;
cst = _0;
return;
}
Constant *cst_lhs = dyn_cast<Constant>(bin_op->getOperand(0));
Constant *cst_rhs = dyn_cast<Constant>(bin_op->getOperand(1));
if(cst_lhs && cst_rhs){
cst = arg;
non_cst = _0;
}
else if(cst_lhs){
cst = cst_lhs;
non_cst = bin_op->getOperand(1);
}
else if(cst_rhs){
cst = cst_rhs;
non_cst = bin_op->getOperand(0);
}
else{
non_cst = arg;
cst = _0;
}
}
void shared_tile::extract_constant(const indices_t &arg_idx, indices_t &non_cst_idx, indices_t &cst_idx) {
non_cst_idx.clear();
cst_idx.clear();
for(Value *idx: arg_idx){
Value *non_cst, *cst;
extract_constant(idx, non_cst, cst);
non_cst_idx.push_back(non_cst);
cst_idx.push_back(cst);
}
}
Value* shared_tile::shared_offset(indices_t idx) {
Value *result = builder_.getInt32(0);
result = builder_.CreateAdd(result, idx[0]);
for(size_t i = 1; i < idx.size(); i++)
result = builder_.CreateAdd(result, builder_.CreateMul(idx[i], builder_.getInt32(shapes_[i-1])));
return result;
}
shared_tile::shared_tile(Type *ty, const shapes_t &shapes, Value *ptr, llvm::IRBuilder<> &builder, Value *offset):
tile(ty, shapes), ptr_(ptr), builder_(builder), offset_(offset) {
}
void shared_tile::set_value(indices_t idx, Value *value) {
Value *ptr = builder_.CreateGEP(ptr_, shared_offset(idx));
unsigned addr_space = ptr->getType()->getPointerAddressSpace();
ptr = builder_.CreateBitCast(ptr, value->getType()->getPointerTo(addr_space));
builder_.CreateStore(value, ptr);
}
Value* shared_tile::get_value(indices_t idx) {
indices_t non_cst_idx, cst_idx;
extract_constant(idx, non_cst_idx, cst_idx);
Value *&base_ptr = ptr_cache_[non_cst_idx];
if(base_ptr == nullptr){
base_ptr = builder_.CreateGEP(ptr_, shared_offset(non_cst_idx));
// Type *vec_ty = VectorType::get(base_ptr->getType()->getPointerElementType(), vec_);
// Type *vec_ptr_ty = PointerType::get(vec_ty, base_ptr->getType()->getPointerElementType());
// base_ptr = builder_.CreateBitCast(base_ptr, vec_ptr_ty);
}
Value *ptr = builder_.CreateGEP(base_ptr, shared_offset(cst_idx));
return builder_.CreateLoad(ptr);
}
/* convert ir::type to Type */
Type *selection::llvm_type(ir::type *ty, LLVMContext &ctx) {
// function
if(auto* tt = dynamic_cast<ir::function_type*>(ty)){
Type *return_ty = llvm_type(tt->get_return_ty(), ctx);
std::vector<Type*> param_tys;
std::transform(tt->params_begin(), tt->params_end(), std::back_inserter(param_tys),
[this,&ctx](ir::type* t){ return llvm_type(t, ctx);});
return FunctionType::get(return_ty, param_tys, false);
}
// pointer
if(ty->is_pointer_ty()){
Type *elt_ty = llvm_type(ty->get_pointer_element_ty(), ctx);
unsigned addr_space = ty->get_pointer_address_space();
return PointerType::get(elt_ty, addr_space);
}
// integer
if(ty->is_integer_ty()){
unsigned bitwidth = ty->get_integer_bitwidth();
return IntegerType::get(ctx, bitwidth);
}
// primitive types
switch(ty->get_type_id()){
case ir::type::VoidTyID: return Type::getVoidTy(ctx);
case ir::type::HalfTyID: return Type::getHalfTy(ctx);
case ir::type::FloatTyID: return Type::getFloatTy(ctx);
case ir::type::DoubleTyID: return Type::getDoubleTy(ctx);
case ir::type::X86_FP80TyID: return Type::getX86_FP80Ty(ctx);
case ir::type::PPC_FP128TyID: return Type::getPPC_FP128Ty(ctx);
case ir::type::LabelTyID: return Type::getLabelTy(ctx);
case ir::type::MetadataTyID: return Type::getMetadataTy(ctx);
case ir::type::TokenTyID: return Type::getTokenTy(ctx);
default: break;
}
// unknown type
throw std::runtime_error("unknown conversion from ir::type to Type");
}
/* convert ir::constant to Constant */
Constant *selection::llvm_constant(ir::constant *cst, LLVMContext &ctx) {
Type *dst_ty = llvm_type(cst->get_type(), ctx);
if(auto* cc = dynamic_cast<ir::constant_int*>(cst))
return ConstantInt::get(dst_ty, cc->get_value());
if(auto* cc = dynamic_cast<ir::constant_fp*>(cst))
return ConstantFP::get(dst_ty, cc->get_value());
// unknown constant
throw std::runtime_error("unknown conversion from ir::constant to Constant");
}
/* convert ir::instruction to llvm::Instruction */
Instruction *selection::llvm_inst(ir::instruction *inst, std::function<Value*(ir::value*)> value, IRBuilder<> &builder) {
LLVMContext & ctx = builder.getContext();
auto block = [&](ir::basic_block *x) { return (BasicBlock*)vmap_.at(x); };
auto type = [&](ir::type *x) { return llvm_type(x, ctx); };
if(auto* ii = dynamic_cast<ir::cond_branch_inst*>(inst)){
BasicBlock *true_dest = block(ii->get_true_dest());
BasicBlock *false_dest = block(ii->get_false_dest());
Value *cond = value(ii->get_cond());
return builder.Insert(BranchInst::Create(true_dest, false_dest, cond));
}
if(auto* ii = dynamic_cast<ir::uncond_branch_inst*>(inst)){
BasicBlock *dest = block(ii->get_dest());
return builder.Insert(BranchInst::Create(dest));
}
if(dynamic_cast<ir::barrier_inst*>(inst)){
Module *module = builder.GetInsertBlock()->getModule();
Function *barrier = Intrinsic::getDeclaration(module, Intrinsic::nvvm_barrier0);
return builder.CreateCall(barrier, {});
}
if(auto* ii = dynamic_cast<ir::phi_node*>(inst)){
Type *ty = type(ii->get_type()->get_scalar_ty());
unsigned num_ops = ii->get_num_operands();
return builder.Insert(PHINode::Create(ty, num_ops));
}
if(auto* ii = dynamic_cast<ir::return_inst*>(inst)){
ir::value *ret_val = ii->get_return_value();
return builder.Insert(ReturnInst::Create(ctx, ret_val?value(ret_val):nullptr));
}
if(auto* ii = dynamic_cast<ir::binary_operator*>(inst)){
Value *lhs = value(ii->get_operand(0));
Value *rhs = value(ii->get_operand(1));
return builder.Insert(BinaryOperator::Create(ii->get_op(), lhs, rhs));
}
if(auto* ii = dynamic_cast<ir::icmp_inst*>(inst)){
CmpInst::Predicate pred = ii->get_pred();
Value *lhs = value(ii->get_operand(0));
Value *rhs = value(ii->get_operand(1));
return builder.Insert(CmpInst::Create(Instruction::ICmp, pred, lhs, rhs));
}
if(auto* ii = dynamic_cast<ir::fcmp_inst*>(inst)){
CmpInst::Predicate pred = ii->get_pred();
Value *lhs = value(ii->get_operand(0));
Value *rhs = value(ii->get_operand(1));
return builder.Insert(FCmpInst::Create(Instruction::FCmp, pred, lhs, rhs));
}
if(auto* ii = dynamic_cast<ir::cast_inst*>(inst)){
Value *arg = value(ii->get_operand(0));
Type *dst_ty = type(ii->get_type()->get_scalar_ty());
return builder.Insert(CastInst::Create(ii->get_op(), arg, dst_ty));
}
if(auto* ii = dynamic_cast<ir::getelementptr_inst*>(inst)){
std::vector<Value*> idx_vals;
std::transform(ii->idx_begin(), ii->idx_end(), std::back_inserter(idx_vals),
[&value](ir::value* x){ return value(x);});
Type *source_ty = type(ii->get_source_elt_ty()->get_scalar_ty());
Value *arg = value(ii->get_operand(0));
return builder.Insert(GetElementPtrInst::Create(source_ty, arg, idx_vals));
}
if(ir::load_inst* ii = dynamic_cast<ir::load_inst*>(inst)){
Value *ptr = value(ii->get_pointer_operand());
return builder.Insert(new LoadInst(ptr));
}
// unknown instruction
throw std::runtime_error("unknown conversion from ir::instruction to Instruction");
}
/* convert ir::value to llvm::Value */
Value* selection::llvm_value(ir::value *v, IRBuilder<> &builder) {
assert(!v->get_type()->is_tile_ty());
LLVMContext &ctx = builder.getContext();
if(vmap_.find(v) != vmap_.end())
return vmap_.at(v);
// create operands
if(auto *cc = dynamic_cast<ir::constant*>(v))
return llvm_constant(cc, ctx);
// instruction
if(auto *ii = dynamic_cast<ir::instruction*>(v)){
auto value = [&](ir::value *x) { return llvm_value(x, builder); };
return llvm_inst(ii, value, builder);
}
// unknown value
throw std::runtime_error("unknown conversion from ir::value to Value");
}
// Grid construction
std::vector<Value*> delinearize(Value *trailing, std::vector<unsigned> &shapes, IRBuilder<> &builder){
size_t dim = shapes.size();
std::vector<Value*> result(dim);
for(unsigned k = 0; k < dim - 1; k++){
Constant *dim_k = builder.getInt32(shapes[k]);
Value *rem = builder.CreateURem(trailing, dim_k);
trailing = builder.CreateUDiv(trailing, dim_k);
result[k] = rem;
}
result[dim - 1] = trailing;
return result;
}
void selection::init_axes(ir::value *v, IRBuilder<> &builder, Value *u_thread_id, Value *u_warp_id) {
const auto& shapes = v->get_type()->get_tile_shapes();
size_t dim = shapes.size();
std::vector<unsigned> contiguous(dim);
std::vector<unsigned> warp_size(dim);
std::vector<unsigned> n_warps(dim);
for(unsigned i = 0; i < shapes.size(); i++){
std::string str_i = std::to_string(i);
contiguous[i] = *params_->get_param(v, "p0.d" + str_i);
warp_size[i] = *params_->get_param(v, "p1.d" + str_i);
n_warps[i] = *params_->get_param(v, "p2.d" + str_i);
}
std::vector<Value*> thread_id_in_warp = delinearize(u_thread_id, warp_size, builder);
std::vector<Value*> warp_id = delinearize(u_warp_id, n_warps, builder);
// Create axes
for(unsigned k = 0; k < dim; k++) {
std::string str_k = std::to_string(k);
Value *warp_size_k = builder.getInt32(warp_size[k]);
Value *contiguous_k = builder.getInt32(contiguous[k]);
Value *thread_id = builder.CreateAdd(thread_id_in_warp[k], builder.CreateMul(warp_id[k], warp_size_k));
thread_id = builder.CreateMul(thread_id, contiguous_k);
unsigned per_block = contiguous[k] * warp_size[k] * n_warps[k];
unsigned per_thread = contiguous[k] * shapes[k]->get_value() / per_block;
std::vector<Value*> idx_list(per_thread);
for(unsigned n = 0 ; n < per_thread; n++){
unsigned offset = n / contiguous[k] * per_block + n % contiguous[k];
idx_list[n] = builder.CreateAdd(thread_id, builder.getInt32(offset), "idx_" + str_k + "_" + std::to_string(n));
}
axes_[params_->get_param(v, "p0.d" + str_k)] = distributed_axis{contiguous[k], idx_list};
}
}
void selection::create_grids(std::vector<ir::value*> &grids,
std::map<unsigned*, ir::value*> &references,
ir::function *fn) {
// get number of dimensions greater than 1
auto get_tile_gt1_dim = [&](ir::value *v){
unsigned result = 0;
for(ir::constant_int* shape: v->get_type()->get_tile_shapes()) {
result += (shape->get_value() > 1)?shape->get_value():0;
}
return result;
};
// bind references
std::set<ir::value*> seen;
std::function<void(ir::value*)> bind_references = [&](ir::value *v)
{
// skip
if(!v->get_type()->is_tile_ty() || !seen.insert(v).second)
return;
// recurse
if(auto *user = dynamic_cast<ir::user*>(v))
for(ir::value *op: user->ops())
bind_references(op);
// bind
const auto& shapes = v->get_type()->get_tile_shapes();
if(dynamic_cast<ir::copy_to_shared_inst*>(v) || buffer_info_->is_double(v))
return;
for(size_t d = 0; d < shapes.size(); d++){
if(shapes[d]->get_value() == 1)
continue;
unsigned *x = params_->get_param(v, "p0.d" + std::to_string(d));
ir::value *&r = references[x];
if(!r || get_tile_gt1_dim(v) > get_tile_gt1_dim(r))
r = v;
}
};
for(ir::basic_block *block: fn->blocks())
for(ir::instruction *i: block->get_inst_list())
bind_references(i);
// create grid
for(auto &ref: references)
if(std::find(grids.begin(), grids.end(), ref.second) == grids.end())
grids.push_back(ref.second);
}
void selection::create_tile(ir::value *v, IRBuilder<> &builder,
const std::map<unsigned*, ir::value*>& references,
std::set<ir::value*> &seen, Value *sh_mem_ptr) {
if(!v->get_type()->is_tile_ty() || !seen.insert(v).second)
return;
if(auto *user = dynamic_cast<ir::user*>(v))
for(ir::value *op: user->ops())
create_tile(op, builder, references, seen, sh_mem_ptr);
LLVMContext &ctx = builder.getContext();
const auto& shapes = v->get_type()->get_tile_shapes();
std::vector<unsigned> shapes2;
for(ir::constant_int* shape: shapes)
shapes2.push_back(shape->get_value());
Type* ty = llvm_type(v->get_type()->get_scalar_ty(), ctx);
// create shared tile
if(dynamic_cast<ir::copy_to_shared_inst*>(v) || (buffer_info_->is_double(v))){
// shared copy
PointerType *ptr_ty = ty->getPointerTo(sh_mem_ptr->getType()->getPointerAddressSpace());
if(dynamic_cast<ir::copy_to_shared_inst*>(v)) {
if(buffer_info_->get_reference(v) == nullptr){
size_t offset = alloc_->get_offset(v);
Value *ptr = builder.CreateGEP(sh_mem_ptr, builder.getInt32(offset));
ptr = builder.CreateBitCast(ptr, ptr_ty);
tmap_.insert({v, new shared_tile(ty, shapes2, ptr, builder)});
}
}
// phi-node (double-buffering)
else if(auto *phi = dynamic_cast<ir::phi_node*>(v)) {
BasicBlock *parent = (BasicBlock*)vmap_[phi->get_parent()];
unsigned id_pre = 0, id_loop = 1;
if(phi->get_incoming_block(0) == phi->get_parent())
std::swap(id_pre, id_loop);
if(parent->empty())
builder.SetInsertPoint(parent);
else
builder.SetInsertPoint(&*parent->getFirstInsertionPt());
PHINode *ptr = builder.CreatePHI(ptr_ty, 2);
PHINode *offset = builder.CreatePHI(builder.getInt32Ty(), 2);
// next pointer
Value *pre_ptr = builder.CreateGEP(sh_mem_ptr, builder.getInt32(alloc_->get_offset(phi)));
pre_ptr = builder.CreateBitCast(pre_ptr, ptr->getType());
Value *next_ptr = builder.CreateGEP(ptr, offset);
tmap_.insert({phi, new shared_tile(ty, shapes2, ptr, builder, offset)});
for(unsigned i = 0; i < phi->get_num_incoming(); i++) {
ir::basic_block* inc_block = phi->get_incoming_block(i);
ir::value* inc_value = phi->get_incoming_value(i);
ir::value* terminator = inc_block->get_inst_list().back();
bool is_loop_latch = buffer_info_->is_loop_latch(phi, terminator);
tmap_.insert({inc_value, new shared_tile(ty, shapes2, is_loop_latch?next_ptr:pre_ptr, builder)});
}
}
else
throw std::runtime_error("unknown shared memory tile");
}
// create distributed tile
else {
const auto &shapes = v->get_type()->get_tile_shapes();
std::vector<distributed_axis> axes(shapes.size());
for(size_t d = 0; d < shapes.size(); d++){
if(shapes[d]->get_value() > 1){
unsigned *x = params_->get_param(v, "p0.d" + std::to_string(d));
axes[d] = axes_.at(x);
}
else{
axes[d].contiguous = 1;
axes[d].values = {builder.getInt32(0)};
}
}
bool vectorize = dynamic_cast<ir::vectorize_inst*>(v);
distributed_tile *T = new distributed_tile(ty, shapes2, axes, builder, vectorize);
tmap_.insert({v, T});
// constant range
if(dynamic_cast<ir::constant*>(v)){
T->for_each([&](indices_t idx){
assert(idx.size() == 1);
T->set_value(idx, idx[0]);
});
}
}
}
void selection::init_grids(ir::function *fn, IRBuilder<> &builder, Value *sh_mem_ptr){
// fetch linear ID
Module *mod = builder.GetInsertBlock()->getParent()->getParent();
Function *get_thread_id = Intrinsic::getDeclaration(mod, Intrinsic::nvvm_read_ptx_sreg_tid_x);
Value *warp_size = builder.getInt32(32);
Value *u_thread_id = builder.CreateCall(get_thread_id, {});
Value *u_thread_warp_id = builder.CreateURem(u_thread_id, warp_size);
Value *u_warp_id = builder.CreateUDiv(u_thread_id, warp_size);
// create grid
std::vector<ir::value*> grids;
std::map<unsigned*, ir::value*> references;
create_grids(grids, references, fn);
for(ir::value* i: grids)
init_axes(i, builder, u_thread_warp_id, u_warp_id);
// create tile
std::set<ir::value*> seen;
for(ir::basic_block *block: fn->blocks())
for(ir::instruction *i: block->get_inst_list()){
if(!i->get_type()->is_tile_ty())
continue;
create_tile(i, builder, references, seen, sh_mem_ptr);
}
}
void selection::lower_tile_instruction(ir::instruction *ins, llvm::IRBuilder<> &builder) {
BasicBlock *block = builder.GetInsertBlock();
Module *module = block->getModule();
Function *function = block->getParent();
ir::value* mask_pred = ins->get_mask_pred();
LLVMContext &ctx = builder.getContext();
// helper to handle masks
auto insert_masked = [&](indices_t idx, std::function<Value*()> insert_value) {
BasicBlock *block = builder.GetInsertBlock();
Value *result;
if(mask_pred){
// if(mask.else_value)
// std::cout << mask.else_value << std::endl;
Value *llvm_mask = tmap_.at(mask_pred)->get_value(idx);
BasicBlock *then_bb = BasicBlock::Create(ctx, "", function);
BasicBlock *done_bb = BasicBlock::Create(ctx, "", function);
builder.CreateCondBr(llvm_mask, then_bb, done_bb);
builder.SetInsertPoint(then_bb);
result = insert_value();
builder.CreateBr(done_bb);
builder.SetInsertPoint(done_bb);
if(!ins->get_type()->is_void_ty()){
Type *ty = result->getType();
PHINode *phi = builder.CreatePHI(ty, 2);
// if(mask.else_value)
// phi->addIncoming(tmap_.at(mask.else_value)->get_value(idx), block);
// else
phi->addIncoming(llvm::UndefValue::get(ty), block);
phi->addIncoming(result, then_bb);
return (Value*)phi;
}
}
else
result = insert_value();
return result;
};
// store
if(auto *x = dynamic_cast<ir::store_inst*>(ins)) {
distributed_tile* ptr = (distributed_tile*)tmap_.at(x->get_pointer_operand());
tile *value = tmap_.at(x->get_value_operand());
ptr->for_each([&](indices_t idx){
insert_masked(idx, [&]{ return builder.CreateStore(value->get_value(idx), ptr->get_value(idx)); });
});
}
else {
tile *ti = tmap_[ins];
distributed_tile* result = (distributed_tile*)ti;
if(!ins->get_type()->is_tile_ty())
return;
const auto& shapes = ins->get_type()->get_tile_shapes();
// global_range
if(auto *x = dynamic_cast<ir::get_global_range_inst*>(ins)) {
static std::array<Intrinsic::ID, 3> ctaid = {
Intrinsic::nvvm_read_ptx_sreg_ctaid_x,
Intrinsic::nvvm_read_ptx_sreg_ctaid_y,
Intrinsic::nvvm_read_ptx_sreg_ctaid_z
};
Function *get_group_id = Intrinsic::getDeclaration(module, ctaid[x->get_axis()]);
Value *group_id = builder.CreateCall(get_group_id, {});
Value *offset = builder.CreateMul(builder.getInt32(shapes[0]->get_value()), group_id);
result->for_each([&](indices_t idx){
BinaryOperator *bin = static_cast<BinaryOperator*>(idx[0]);
result->set_value(idx, insert_masked(idx, [&]{ return builder.CreateAdd(bin, offset); }));
});
}
// reshape
else if(dynamic_cast<ir::reshape_inst*>(ins)) {
ir::value* in = ins->get_operand(0);
distributed_tile *in_tile = (distributed_tile*)tmap_.at(in);
result->for_each([&](indices_t out_idx){
indices_t in_idx;
for(size_t k = 0; k < shapes.size(); k++){
if(shapes[k]->get_value() > 1)
in_idx.push_back(out_idx[k]);
}
result->set_value(out_idx, in_tile->get_value(in_idx));
});
}
// splat
else if(dynamic_cast<ir::splat_inst*>(ins)) {
result->for_each([&](indices_t idx) {
result->set_value(idx, insert_masked(idx, [&]{ return llvm_value(ins->get_operand(0), builder); }));
});
}
// broadcast
else if(dynamic_cast<ir::broadcast_inst*>(ins)) {
ir::value* in = ins->get_operand(0);
const auto& in_shapes = in->get_type()->get_tile_shapes();
distributed_tile *in_tile = (distributed_tile*)tmap_.at(in);
result->for_each([&](indices_t out_idx){
indices_t in_idx = out_idx;
for(size_t k = 0; k < in_idx.size(); k++){
if(in_shapes[k]->get_value() == 1)
in_idx[k] = builder.getInt32(0);
}
result->set_value(out_idx, in_tile->get_value(in_idx));
});
}
// vectorize
else if(dynamic_cast<ir::vectorize_inst*>(ins)) {
distributed_tile* in = (distributed_tile*)tmap_.at(ins->get_operand(0));
unsigned vector_size = result->axis(0).contiguous;
std::map<unsigned, Value*> packets;
in->for_each([&](indices_t idx){
unsigned linear = in->get_linear_index(idx);
unsigned id = linear / vector_size;
if(linear % vector_size == 0)
packets[id] = result->get_value(idx);
packets[id] = builder.CreateInsertElement(packets[id], in->get_value(idx), linear % vector_size);
});
result->for_each([&](indices_t idx){
unsigned linear = in->get_linear_index(idx);
unsigned id = linear / vector_size;
if(linear % vector_size == 0)
result->set_value(idx, packets[id]);
});
}
// copy to shared
else if(dynamic_cast<ir::copy_to_shared_inst*>(ins)) {
distributed_tile* in = (distributed_tile*)tmap_.at(ins->get_operand(0));
in->for_each([&](indices_t idx){
ti->set_value(idx, in->get_value(idx));
});
}
else if(dynamic_cast<ir::copy_to_shared_inst*>(ins) || (buffer_info_->is_double(ins)))
return;
// matrix multiplication
else if(dynamic_cast<ir::matmul_inst*>(ins)) {
ir::value *A = ins->get_operand(0);
ir::value *B = ins->get_operand(1);
ir::value *C = ins->get_operand(2);
Function *f_mul_add = Intrinsic::getDeclaration(module, Intrinsic::fmuladd, {llvm_type(C->get_type()->get_scalar_ty(), ctx)});
result->for_each([&](indices_t idx){
Value *res = tmap_.at(C)->get_value(idx);
unsigned NK = A->get_type()->get_tile_shapes()[1]->get_value();
for(unsigned K = 0; K < NK; ++K){
indices_t a_idx = {idx[0], builder.getInt32(K)};
indices_t b_idx = {idx[1], builder.getInt32(K)};
Value *a = tmap_.at(A)->get_value(a_idx);
Value *b = tmap_.at(B)->get_value(b_idx);
res = builder.CreateCall(f_mul_add, {a, b, res});
}
result->set_value(idx, res);
});
}
// element-wise
else {
result->for_each([&](indices_t idx){
auto value = [&](ir::value *x) {
if(x->get_type()->is_tile_ty())
return tmap_.at(x)->get_value(idx);
else
return llvm_value(x, builder);
};
result->set_value(idx, insert_masked(idx, [&]() { return llvm_inst(ins, value, builder); }));
});
}
}
}
void selection::lower_instruction(ir::instruction *src, IRBuilder<> &builder) {
if(src->has_tile_result_or_op()) {
lower_tile_instruction(src, builder);
}
else {
Instruction *i = (Instruction*)llvm_value(src, builder);
vmap_[src] = i;
}
}
void selection::run(ir::module &src, Module &dst){
vmap_.clear();
LLVMContext &dst_ctx = dst.getContext();
IRBuilder<> dst_builder(dst_ctx);
std::map<ir::value*, llvm::BasicBlock*> block_of;
// iterate over functions
for(ir::function *fn: src.get_function_list()) {
// create LLVM function
FunctionType *fn_ty = (FunctionType*)llvm_type(fn->get_fn_type(), dst_ctx);
Function *dst_fn = Function::Create(fn_ty, Function::ExternalLinkage, fn->get_name(), &dst);
// Set metadata
llvm::Metadata *md_args[] = {
llvm::ValueAsMetadata::get(dst_fn),
llvm::MDString::get(dst_ctx, "kernel"),
llvm::ValueAsMetadata::get(dst_builder.getInt32(1))
};
dst.getOrInsertNamedMetadata("nvvm.annotations")->addOperand(llvm::MDNode::get(dst_ctx, md_args));
// map parameters
for(unsigned i = 0; i < fn->args().size(); i++)
vmap_[fn->args()[i]] = &*(dst_fn->arg_begin() + i);
// create blocks
for(ir::basic_block *block: fn->blocks()) {
BasicBlock *dst_block = BasicBlock::Create(dst_ctx, block->get_name(), dst_fn);
vmap_[block] = dst_block;
}
dst_builder.SetInsertPoint((BasicBlock*)vmap_[fn->blocks()[0]]);
// allocate shared memory
Value *sh_mem_ptr = nullptr;
if(unsigned alloc_size = alloc_->get_allocated_size()){
Type *int_8_ty = Type::getInt8Ty(dst_ctx);
ArrayType *array_ty = ArrayType::get(int_8_ty, alloc_size);
Type *ptr_ty = PointerType::get(int_8_ty, 3);
GlobalVariable *sh_mem_array =
new GlobalVariable(*dst_fn->getParent(), array_ty, false, GlobalVariable::ExternalLinkage,
nullptr, "__shared_ptr", nullptr, GlobalVariable::NotThreadLocal, 3);
sh_mem_ptr = dst_builder.CreateBitCast(sh_mem_array, ptr_ty);
}
// create grids
init_grids(fn, dst_builder, sh_mem_ptr);
std::map<ir::basic_block*, BasicBlock*> last_block;
// iterate through block
for(ir::basic_block *block: fn->blocks()) {
BasicBlock *parent = (BasicBlock*)vmap_[block];
dst_builder.SetInsertPoint(parent);
for(ir::instruction *i: block->get_inst_list()){
if(dynamic_cast<ir::phi_node*>(i) && !parent->empty()){
dst_builder.SetInsertPoint(&*parent->getFirstInsertionPt());
}
lower_instruction(i, dst_builder);
if(dynamic_cast<ir::phi_node*>(i) && !parent->empty())
dst_builder.SetInsertPoint(parent);
last_block[block] = dst_builder.GetInsertBlock();
}
}
// add phi operands
for(ir::basic_block *block: fn->blocks())
for(ir::instruction *inst: block->get_inst_list())
if(auto *phi = dynamic_cast<ir::phi_node*>(inst)){
if(buffer_info_->is_double(phi)) {
PHINode *ptr = (PHINode*)((shared_tile*)tmap_.at(phi))->get_pointer();
PHINode *offset = (PHINode*)((shared_tile*)tmap_.at(phi))->get_offset();
for(unsigned n = 0; n < phi->get_num_incoming(); n++){
ir::value *inc_val = phi->get_incoming_value(n);
ir::basic_block *inc_block = phi->get_incoming_block(n);
BasicBlock *llvm_inc_block = last_block.at(inc_block);
shared_tile *inc_shared = (shared_tile*)tmap_.at(inc_val);
GetElementPtrInst *inc_ptr = dyn_cast<GetElementPtrInst>(inc_shared->get_pointer());
if(inc_ptr && ptr == inc_ptr->getPointerOperand()){
dst_builder.SetInsertPoint(llvm_inc_block->getTerminator());
Value *next_offset = dst_builder.CreateNeg(offset);
offset->addIncoming(next_offset, llvm_inc_block);
}
else {
offset->addIncoming(dst_builder.getInt32(alloc_->get_num_bytes(phi)/(2*4)), llvm_inc_block);
}
ptr->addIncoming(inc_shared->get_pointer(), llvm_inc_block);
}
}
else {
for(unsigned n = 0; n < phi->get_num_incoming(); n++){
ir::value *inc_val = phi->get_incoming_value(n);
ir::basic_block *inc_block = phi->get_incoming_block(n);
BasicBlock *llvm_inc_block = last_block.at(inc_block);
if(phi->get_type()->is_tile_ty()) {
distributed_tile *phi_tile = (distributed_tile*)tmap_.at(phi);
distributed_tile *inc_tile = (distributed_tile*)tmap_.at(inc_val);
phi_tile->for_each([&](indices_t idx){
PHINode *llvm_phi = (PHINode*)phi_tile->get_value(idx);
Value *llvm_inc_val = inc_tile->get_value(idx);
llvm_phi->addIncoming(llvm_inc_val, llvm_inc_block);
});
}
else {
PHINode *llvm_phi = (PHINode*)vmap_.at(phi);
Value *llvm_inc_val = vmap_.at(inc_val);
llvm_phi->addIncoming(llvm_inc_val, llvm_inc_block);
}
}
}
}
}
}
}
}
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