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a3f76b6eb1515f20eb3a51abe7b53b450e359208
triton/lib/codegen/selection.cc
Philippe Tillet a3f76b6eb1 [codegen] more cleaning
2019-10-09 21:59:35 -04:00

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#include <numeric>
#include "triton/codegen/selection.h"
#include "triton/codegen/target.h"
#include "triton/codegen/analysis/liveness.h"
#include "triton/codegen/analysis/layout.h"
#include "triton/codegen/analysis/axes.h"
#include "triton/codegen/analysis/allocation.h"
#include "triton/codegen/analysis/align.h"
#include "triton/codegen/transform/coalesce.h"
#include "triton/codegen/instructions.h"
#include "triton/ir/context.h"
#include "triton/ir/module.h"
#include "triton/ir/function.h"
#include "triton/ir/type.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/Transforms/Scalar/EarlyCSE.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/InlineAsm.h"
namespace triton{
namespace codegen{
using namespace llvm;
/* Distributed Tile */
void distributed_tile::init_indices() {
std::vector<size_t> id(axes_.size(), 0);
// create iteration order
std::vector<size_t> order(id.size());
std::iota(order.begin(), order.end(), 0);
auto cmp = [&](int x, int y) {
return axes_[x].contiguous > axes_[y].contiguous;
};
std::sort(order.begin(), order.end(), cmp);
// build
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]]);
size_t sz = indices_.size();
indices_[current] = sz;
values_[current] = nullptr;
ordered_indices_.push_back(current);
id[order[0]]++;
while(id[order[k]] == axes_[order[k]].values.size()){
if(k == id.size() - 1)
return;
id[order[k++]] = 0;
id[order[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 std::vector<int>& order, const axes_t &axes, llvm::IRBuilder<> &builder, bool vectorize)
: tile(make_vector_ty(ty, vectorize?axes[0].contiguous:1), shapes), axes_(axes), order_(order), builder_(builder) {
vector_size_ = vectorize?ty_->getVectorNumElements():1;
init_indices();
}
void distributed_tile::set_value(indices_t idx, Value *x) {
assert(x->getType() == ty_ && "cannot set a value of different type");
Value *&result = values_[idx];
assert(!result && "value cannot be set twice");
result = x;
}
Value* distributed_tile::get_value(indices_t idx) {
Value *result = values_.at(idx);
assert(result && "value has not been set");
return result;
}
unsigned distributed_tile::get_linear_index(indices_t idx) {
return indices_[idx];
}
indices_t distributed_tile::get_ordered_indices(unsigned id) {
return ordered_indices_.at(id);
}
void distributed_tile::for_each(std::function<void (indices_t)> fn) {
for(unsigned i = 0; i < ordered_indices_.size(); i++){
if(i % vector_size_ == 0)
fn(ordered_indices_[i]);
}
}
/* 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(llvm::IRBuilder<> &builder, const shapes_t& shapes, const std::vector<int>& perm, const std::vector<int>& order, indices_t idx) {
// strides
std::vector<Value*> strides(order.size());
strides[order[0]] = builder.getInt32(1);
for(size_t i = 1; i < idx.size(); i++)
strides[order[i]] = builder.CreateMul(strides[order[i-1]], builder.getInt32(shapes[order[i-1]]));
// result
Value *result = builder.getInt32(0);
for(size_t i = 0; i < strides.size(); i++)
result = builder.CreateAdd(result, builder.CreateMul(idx[perm[i]], strides[i]));
return result;
}
shared_tile::shared_tile(Type *ty, const shapes_t &shapes, const std::vector<int>& order, Value *ptr, llvm::IRBuilder<> &builder, Value *offset, const std::vector<int>& perm):
tile(ty, shapes), order_(order), ptr_(ptr), builder_(builder), offset_(offset), vector_size_(1), perm_(perm){
return_vector_ = false;
if(perm_.empty()){
perm_.resize(shapes.size());
std::iota(perm_.begin(), perm_.end(), 0);
}
}
void shared_tile::set_value(indices_t idx, Value *value) {
Value *ptr = builder_.CreateGEP(ptr_, shared_offset(builder_, shapes_, perm_, order_, idx));
unsigned addr_space = ptr->getType()->getPointerAddressSpace();
ptr = builder_.CreateBitCast(ptr, value->getType()->getPointerTo(addr_space));
builder_.CreateStore(value, ptr);
}
void shared_tile::set_vector_size(unsigned vector_size) {
vector_size_ = vector_size;
}
void shared_tile::set_return_mode(bool return_vector){
return_vector_ = return_vector;
}
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];
unsigned vector_size = vector_size_;
Type *ty = ty_;
if(ty->isHalfTy() && (vector_size % 2 == 0)){
ty = IntegerType::get(ty->getContext(), 32);
vector_size = vector_size / 2;
}
if(base_ptr == nullptr){
// BasicBlock* store = builder_.GetInsertBlock();
// if(!non_cst_idx.empty())
// if(isa<Instruction>(non_cst_idx.front())){
// builder_.SetInsertPoint((Instruction*)non_cst_idx.front());
// }
base_ptr = builder_.CreateGEP(ptr_, shared_offset(builder_, shapes_, perm_, order_, non_cst_idx));
if(vector_size_ > 1){
Type *vec_ty = VectorType::get(ty, vector_size);
Type *vec_ptr_ty = PointerType::get(vec_ty, base_ptr->getType()->getPointerAddressSpace());
base_ptr = builder_.CreateBitCast(base_ptr, vec_ptr_ty);
}
// builder_.SetInsertPoint(store);
}
Value *offset = shared_offset(builder_, shapes_, perm_, order_, cst_idx);
Value *div = offset;
if(vector_size_ > 1)
div = builder_.CreateUDiv(offset, builder_.getInt32(vector_size_));
Value *ptr = builder_.CreateGEP(base_ptr, div);
Value *result = builder_.CreateLoad(ptr);
if(return_vector_ == false && vector_size_ > 1) {
Value *rem = builder_.CreateURem(offset, builder_.getInt32(vector_size_));
result = builder_.CreateExtractElement(result, rem);
}
return result;
}
llvm::Instruction::BinaryOps llvm_op(ir::binary_op_t op) {
using llop = llvm::Instruction::BinaryOps;
using ttop = ir::binary_op_t;
switch(op) {
case ttop::Add: return llop::Add;
case ttop::FAdd: return llop::FAdd;
case ttop::Sub: return llop::Sub;
case ttop::FSub: return llop::FSub;
case ttop::Mul: return llop::Mul;
case ttop::FMul: return llop::FMul;
case ttop::UDiv: return llop::UDiv;
case ttop::SDiv: return llop::SDiv;
case ttop::FDiv: return llop::FDiv;
case ttop::URem: return llop::URem;
case ttop::SRem: return llop::SRem;
case ttop::FRem: return llop::FRem;
case ttop::Shl: return llop::Shl;
case ttop::LShr: return llop::LShr;
case ttop::AShr: return llop::AShr;
case ttop::And: return llop::And;
case ttop::Or: return llop::Or;
case ttop::Xor: return llop::Xor;
}
throw std::runtime_error("unknown operator");
}
llvm::Instruction::CastOps llvm_op(ir::cast_op_t op) {
using llop = llvm::Instruction::CastOps;
using ttop = ir::cast_op_t;
switch(op){
case ttop::Trunc: return llop::Trunc;
case ttop::ZExt: return llop::ZExt;
case ttop::SExt: return llop::SExt;
case ttop::FPTrunc: return llop::FPTrunc;
case ttop::FPExt: return llop::FPExt;
case ttop::UIToFP: return llop::UIToFP;
case ttop::SIToFP: return llop::SIToFP;
case ttop::FPToUI: return llop::FPToUI;
case ttop::FPToSI: return llop::FPToSI;
case ttop::PtrToInt: return llop::PtrToInt;
case ttop::IntToPtr: return llop::IntToPtr;
case ttop::BitCast: return llop::BitCast;
case ttop::AddrSpaceCast: return llop::AddrSpaceCast;
}
throw std::runtime_error("unknown operator");
}
llvm::CmpInst::Predicate llvm_pred(ir::cmp_pred_t pred) {
using llop = llvm::CmpInst::Predicate;
using ttop = ir::cmp_pred_t;
switch(pred){
case ttop::FIRST_FCMP_PREDICATE: return llop::FIRST_FCMP_PREDICATE;
case ttop::FCMP_FALSE: return llop::FCMP_FALSE;
case ttop::FCMP_OEQ: return llop::FCMP_OEQ;
case ttop::FCMP_OGT: return llop::FCMP_OGT;
case ttop::FCMP_OGE: return llop::FCMP_OGE;
case ttop::FCMP_OLT: return llop::FCMP_OLT;
case ttop::FCMP_OLE: return llop::FCMP_OLE;
case ttop::FCMP_ONE: return llop::FCMP_ONE;
case ttop::FCMP_ORD: return llop::FCMP_ORD;
case ttop::FCMP_UNO: return llop::FCMP_UNO;
case ttop::FCMP_UEQ: return llop::FCMP_UEQ;
case ttop::FCMP_UGT: return llop::FCMP_UGT;
case ttop::FCMP_UGE: return llop::FCMP_UGE;
case ttop::FCMP_ULT: return llop::FCMP_ULT;
case ttop::FCMP_ULE: return llop::FCMP_ULE;
case ttop::FCMP_UNE: return llop::FCMP_UNE;
case ttop::FCMP_TRUE: return llop::FCMP_TRUE;
case ttop::LAST_FCMP_PREDICATE: return llop::LAST_FCMP_PREDICATE;
case ttop::FIRST_ICMP_PREDICATE: return llop::FIRST_ICMP_PREDICATE;
case ttop::ICMP_EQ: return llop::ICMP_EQ;
case ttop::ICMP_NE: return llop::ICMP_NE;
case ttop::ICMP_UGT: return llop::ICMP_UGT;
case ttop::ICMP_UGE: return llop::ICMP_UGE;
case ttop::ICMP_ULT: return llop::ICMP_ULT;
case ttop::ICMP_ULE: return llop::ICMP_ULE;
case ttop::ICMP_SGT: return llop::ICMP_SGT;
case ttop::ICMP_SGE: return llop::ICMP_SGE;
case ttop::ICMP_SLT: return llop::ICMP_SLT;
case ttop::ICMP_SLE: return llop::ICMP_SLE;
case ttop::LAST_ICMP_PREDICATE: return llop::LAST_ICMP_PREDICATE;
}
throw std::runtime_error("unknown operator");
}
/* 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()->get_scalar_ty(), 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();
return tgt_->add_barrier(module, builder);
}
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(llvm_op(ii->get_op()), lhs, rhs));
}
if(auto* ii = dynamic_cast<ir::icmp_inst*>(inst)){
ir::cmp_pred_t 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, llvm_pred(pred), lhs, rhs));
}
if(auto* ii = dynamic_cast<ir::fcmp_inst*>(inst)){
ir::cmp_pred_t 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, llvm_pred(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(llvm_op(ii->get_op()), arg, dst_ty));
}
if(auto* ii = dynamic_cast<ir::getelementptr_inst*>(inst)){
// get pointer
Value *ptr = value(ii->get_operand(0));
// reassociate first index
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());
return builder.Insert(GetElementPtrInst::CreateInBounds(source_ty, ptr, idx_vals));
}
if(ir::load_inst* ii = dynamic_cast<ir::load_inst*>(inst)){
Value *ptr = value(ii->get_pointer_operand());
LoadInst *result = new LoadInst(ptr);
return builder.Insert(result);
}
if(ir::store_inst* ii = dynamic_cast<ir::store_inst*>(inst)){
Value *val = value(ii->get_value_operand());
Value *ptr = value(ii->get_pointer_operand());
builder.CreateStore(val, ptr);
return nullptr;
}
if(ir::select_inst* ii = dynamic_cast<ir::select_inst*>(inst)){
Value *pred = value(ii->get_operand(0));
Value *if_value = value(ii->get_operand(1));
Value *else_value = value(ii->get_operand(2));
return builder.Insert(SelectInst::Create(pred, if_value, else_value));
}
if(ir::get_program_id_inst* ii = dynamic_cast<ir::get_program_id_inst*>(inst)){
Value *result = tgt_->get_block_id(builder.GetInsertBlock()->getModule(), builder, ii->get_axis());
return (Instruction*)result;
}
if(ir::get_num_program_inst* ii = dynamic_cast<ir::get_num_program_inst*>(inst)){
Value *result = tgt_->get_num_blocks(builder.GetInsertBlock()->getModule(), builder, ii->get_axis());
return (Instruction*)result;
}
if(ir::atomic_cas_inst* ii = dynamic_cast<ir::atomic_cas_inst*>(inst)){
BasicBlock *current = builder.GetInsertBlock();
Module *module = current->getModule();
Value *tid = tgt_->get_local_id(module, builder, 0);
Value *pred = builder.CreateICmpEQ(tid, builder.getInt32(0));
BasicBlock *tid_0_bb = BasicBlock::Create(ctx, "tid_0", current->getParent());
BasicBlock *tid_0_done_bb = BasicBlock::Create(ctx, "tid_0_done", current->getParent());
Value *ptr = builder.CreateGEP(sh_mem_ptr_, builder.getInt32(alloc_->offset(ii)));
ptr = builder.CreateBitCast(ptr, PointerType::get(builder.getInt32Ty(), ptr->getType()->getPointerAddressSpace()));
tgt_->add_memfence(module, builder);
tgt_->add_barrier(module, builder);
builder.CreateCondBr(pred, tid_0_bb, tid_0_done_bb);
builder.SetInsertPoint(tid_0_bb);
Value *cas_ptr = value(ii->get_operand(0));
Value *cas_cmp = value(ii->get_operand(1));
Value *cas_val = value(ii->get_operand(2));
Value *old = builder.CreateAtomicCmpXchg(cas_ptr, cas_cmp, cas_val, AtomicOrdering::Monotonic, AtomicOrdering::Monotonic);
old = builder.CreateExtractValue(old, {0});
builder.CreateStore(old, ptr);
builder.CreateBr(tid_0_done_bb);
builder.SetInsertPoint(tid_0_done_bb);
tgt_->add_memfence(module, builder);
tgt_->add_barrier(module, builder);
Value *res = builder.CreateLoad(ptr);
return (Instruction*)res;
}
if(ir::atomic_exch_inst* ii = dynamic_cast<ir::atomic_exch_inst*>(inst)){
BasicBlock *current = builder.GetInsertBlock();
Module *module = current->getModule();
Value *rmw_ptr = value(ii->get_operand(0));
Value *rmw_val = value(ii->get_operand(1));
Value *tid = tgt_->get_local_id(module, builder, 0);
Value *pred = builder.CreateICmpEQ(tid, builder.getInt32(0));
BasicBlock *tid_0_bb = BasicBlock::Create(ctx, "tid_0", current->getParent());
BasicBlock *tid_0_done_bb = BasicBlock::Create(ctx, "tid_0_done", current->getParent());
tgt_->add_memfence(module, builder);
tgt_->add_barrier(module, builder);
builder.CreateCondBr(pred, tid_0_bb, tid_0_done_bb);
builder.SetInsertPoint(tid_0_bb);
Value *res = builder.CreateAtomicRMW(AtomicRMWInst::Xchg, rmw_ptr, rmw_val, AtomicOrdering::Monotonic, SyncScope::System);
builder.CreateBr(tid_0_done_bb);
builder.SetInsertPoint(tid_0_done_bb);
tgt_->add_memfence(module, builder);
tgt_->add_barrier(module, builder);
return (Instruction*)res;
}
if(ir::atomic_add_inst* ii = dynamic_cast<ir::atomic_add_inst*>(inst)){
// Value *ptr = value(ii->get_operand(0));
// Value *val = value(ii->get_operand(1));
// Value *atom_f_add = nullptr;
// if(val->getType()->isFloatTy())
// atom_f_add = Intrinsic::getDeclaration(builder.GetInsertBlock()->getModule(), Intrinsic::nvvm_atomic_load_add_f32, {ptr->getType()});
// else if(val->getType()->isHalfTy()){
// Type *fp16 = Type::getHalfTy(ctx);
// FunctionType *atom_ty = FunctionType::get(fp16, {fp16->getPointerTo(), fp16}, false);
// atom_f_add = InlineAsm::get(atom_ty, " atom.relaxed.global.gpu.add.noftz.f16 $0, [$1], $2;", "=h,l,h", true);
// }
// if(atom_f_add == nullptr)
throw std::runtime_error("unsupported");
// Value *res = builder.CreateCall(atom_f_add, {ptr, val});
// return (Instruction*)res;
}
if(ir::sqrt_inst* ii = dynamic_cast<ir::sqrt_inst*>(inst)){
Value *val = value(ii->get_operand(0));
Value *sqrt = Intrinsic::getDeclaration(builder.GetInsertBlock()->getModule(), Intrinsic::sqrt, {val->getType()});
Value *res = builder.CreateCall(sqrt, {val});
return (Instruction*)res;
}
// unknown instruction
throw std::runtime_error("unknown conversion from ir::instruction to Instruction");
}
/* convert ir::alloc_const to llvm::GlobalVariable */
Value* selection::llvm_alloc_const(ir::alloc_const *v, Module *module, IRBuilder<> &builder) {
unsigned size = ((ir::constant_int*)v->get_operand(0))->get_value();
Type *element_ty = llvm_type(v->get_type()->get_pointer_element_ty(), module->getContext());
Type *array_ty = llvm::ArrayType::get(element_ty, size);
Value *array = new llvm::GlobalVariable(*module, array_ty, false, llvm::GlobalVariable::ExternalLinkage,
nullptr, v->get_name(), nullptr, llvm::GlobalVariable::NotThreadLocal, 4);
return builder.CreateBitCast(array, element_ty->getPointerTo(4));
}
/* 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);
// alloc const
if(auto *cc = dynamic_cast<ir::alloc_const*>(v)){
BasicBlock *block = builder.GetInsertBlock();
Module *module = block->getModule();
unsigned size = ((ir::constant_int*)cc->get_operand(0))->get_value();
Type *element_ty = llvm_type(cc->get_type()->get_pointer_element_ty(), ctx);
Type *array_ty = llvm::ArrayType::get(element_ty, size);
if(vmap_.find(v) == vmap_.end()){
Value *array = new llvm::GlobalVariable(*module, array_ty, false, llvm::GlobalVariable::ExternalLinkage,
nullptr, cc->get_name(), nullptr, llvm::GlobalVariable::NotThreadLocal, 4);
vmap_[v] = builder.CreateBitCast(array, array->getType()->getArrayElementType()->getPointerTo(4));
}
return vmap_.at(v);
}
// 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");
}
/* -------------------
* ---- Init Axes ----
* ------------------- */
// Grid construction
std::vector<Value*> delinearize(Value *trailing, const std::vector<int>& order, 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[order[k]]);
Value *rem = builder.CreateURem(trailing, dim_k);
trailing = builder.CreateUDiv(trailing, dim_k);
result[order[k]] = rem;
}
result[order[dim - 1]] = trailing;
return result;
}
inline int32_t ceil(int32_t num, int32_t div){
return (num + div - 1)/div;
}
void selection::init_strided_scan_axes(const analysis::layout_t& layout, IRBuilder<> &builder, Value *u_thread_id, Value *u_warp_id) {
auto order = layout.order;
const auto& shapes = layout.shapes;
size_t dim = shapes.size();
std::vector<unsigned> nts(dim);
std::vector<unsigned> mts(dim);
for(unsigned i = 0; i < shapes.size(); i++){
nts[i] = layout.nts.at(i);
mts[i] = layout.mts.at(i);
}
Value* full_thread_id = builder.CreateAdd(builder.CreateMul(u_warp_id, builder.getInt32(32)), u_thread_id);
std::vector<Value*> thread_id = delinearize(full_thread_id, order, mts, builder);
// Create axes
for(unsigned k = 0; k < dim; k++) {
std::string str_k = std::to_string(k);
Value *contiguous_k = builder.getInt32(nts[k]);
Value *scaled_thread_id = builder.CreateMul(thread_id[k], contiguous_k);
unsigned per_block = nts[k] * mts[k];
unsigned per_thread = nts[k] * shapes[k] / per_block;
std::vector<Value*> idx_list(per_thread);
for(unsigned n = 0 ; n < per_thread; n++){
unsigned offset = n / nts[k] * per_block + n % nts[k];
idx_list[n] = builder.CreateAdd(scaled_thread_id, builder.getInt32(offset), "idx_" + str_k + "_" + std::to_string(n));
}
axes_[layout.axes[k]] = distributed_axis{nts[k], idx_list, thread_id[k]};
}
}
void selection::init_hmma_axes(const analysis::layout_t& layout, IRBuilder<> &builder, Value *u_thread_id, Value *u_warp_id) {
const auto& shapes = layout.shapes;
if(shapes.size() > 3)
throw std::runtime_error("unsupported");
bool is_batched = shapes.size() >= 3;
Value *_1 = builder.getInt32(1);
Value *_2 = builder.getInt32(2);
Value *_3 = builder.getInt32(3);
Value *_4 = builder.getInt32(4);
Value *_16 = builder.getInt32(16);
// fragments per warp
unsigned fpw_0 = layout.fpw.at(0);
unsigned fpw_1 = layout.fpw.at(1);
unsigned fpw_2 = is_batched ? layout.fpw.at(2) : 1;
// warps per tile
unsigned wpt_0 = layout.wpt.at(0);
unsigned wpt_1 = layout.wpt.at(1);
unsigned wpt_2 = is_batched ? layout.wpt.at(2) : 1;
// hmma warp tile size
unsigned hmma_wts_0 = fpw_0 * 8;
unsigned hmma_wts_1 = fpw_1 * 8;
unsigned hmma_wts_2 = is_batched ? fpw_2 : 1;
// hmma block tile size
unsigned hmma_bts_0 = hmma_wts_0 * wpt_0;
unsigned hmma_bts_1 = hmma_wts_1 * wpt_1;
unsigned hmma_bts_2 = is_batched ? hmma_wts_2 * wpt_2 : 1;
// number of repetition
unsigned num_rep_0 = shapes[0] / hmma_bts_0;
unsigned num_rep_1 = shapes[1] / hmma_bts_1;
unsigned num_rep_2 = is_batched ? shapes[2] / hmma_bts_2 : 1;
// size of each pack (interleaving)
pack_size_0_ = std::min<unsigned>(num_rep_0, 1);
pack_size_1_ = std::min<unsigned>(num_rep_1, 1);
// number of packs (interleaving)
num_packs_0_ = num_rep_0 / pack_size_0_;
num_packs_1_ = num_rep_1 / pack_size_1_;
/* intra warp offset */
// offset of quad in pair
Value *in_pair_off_a = builder.CreateMul(builder.CreateUDiv(builder.CreateAnd(u_thread_id, _16), builder.getInt32(4)),
builder.getInt32(fpw_0 * pack_size_0_));
Value *in_pair_off_b = builder.CreateMul(builder.CreateUDiv(builder.CreateAnd(u_thread_id, _16), builder.getInt32(4)),
builder.getInt32(fpw_1 * pack_size_1_));
// Quad pair id
Value *pair_a_id = builder.CreateUDiv(builder.CreateURem(u_thread_id, _16), _4);
Value *pair_b_id = builder.CreateUDiv(builder.CreateURem(u_thread_id, _16), _4);
pair_a_id = builder.CreateURem(pair_a_id, builder.getInt32(fpw_0));
pair_b_id = builder.CreateUDiv(pair_b_id, builder.getInt32(fpw_0));
pair_b_id = builder.CreateURem(pair_b_id, builder.getInt32(fpw_1));
// Quad pair offset
Value *pair_a_off = builder.CreateMul(pair_a_id, builder.getInt32(4 * pack_size_0_));
Value *pair_b_off = builder.CreateMul(pair_b_id, builder.getInt32(4 * pack_size_1_));
/* inter warp offset */
Value *warp_id_0 = builder.CreateURem(u_warp_id, builder.getInt32(wpt_0));
Value *warp_id_12 = builder.CreateUDiv(u_warp_id, builder.getInt32(wpt_0));
Value *warp_id_1 = builder.CreateURem(warp_id_12, builder.getInt32(wpt_1));
Value *warp_id_2 = builder.CreateUDiv(warp_id_12, builder.getInt32(wpt_1));
Value *warp_offset_i = builder.CreateMul(warp_id_0, builder.getInt32(hmma_wts_0 * pack_size_0_));
Value *warp_offset_j = builder.CreateMul(warp_id_1, builder.getInt32(hmma_wts_1 * pack_size_1_));
/* offsets */
// a offset
offset_a_i_ = builder.CreateAdd(warp_offset_i, builder.CreateAdd(pair_a_off, in_pair_off_a));
offset_a_k_ = builder.CreateAnd(u_thread_id, _3);
// b offsets
offset_b_j_ = builder.CreateAdd(warp_offset_j, builder.CreateAdd(pair_b_off, in_pair_off_b));
offset_b_k_ = builder.CreateAnd(u_thread_id, _3);
// c offsets
Value *offset_c_i = builder.CreateAdd(builder.CreateAnd(u_thread_id, _1), offset_a_i_);
Value *offset_c_j = builder.CreateAdd(builder.CreateAnd(u_thread_id, _2),
builder.CreateAdd(warp_offset_j, pair_b_off));
/* indices */
// i indices
std::vector<Value*> idx_i;
for(unsigned pack = 0; pack < num_packs_0_; pack++)
for(unsigned ii = 0; ii < pack_size_0_; ii++)
for(unsigned i = 0; i < 2; i++){
idx_i.push_back(builder.CreateAdd(offset_c_i, builder.getInt32(pack*hmma_bts_0*pack_size_0_ + ii*4 + i*2)));
}
// j indices
std::vector<Value*> idx_j;
for(unsigned pack = 0; pack < num_packs_1_; pack++)
for(unsigned jj = 0; jj < pack_size_1_; jj++)
for(unsigned j = 0; j < 2; j++){
idx_j.push_back(builder.CreateAdd(offset_c_j, builder.getInt32(pack*hmma_bts_1*pack_size_1_ + jj*4 + j*4*fpw_1*pack_size_1_)));
idx_j.push_back(builder.CreateAdd(offset_c_j, builder.getInt32(pack*hmma_bts_1*pack_size_1_ + jj*4 + j*4*fpw_1*pack_size_1_ + 1)));
}
// z indices
std::vector<Value*> idx_z;
for(unsigned pack = 0; pack < num_rep_2; pack++)
idx_z.push_back(builder.CreateAdd(warp_id_2, builder.getInt32(pack*hmma_bts_2)));
/* axes */
axes_[layout.axes[0]] = distributed_axis{1, idx_i, warp_id_0};
axes_[layout.axes[1]] = distributed_axis{1, idx_j, warp_id_1};
if(is_batched)
axes_[layout.axes[2]] = distributed_axis{1, idx_z, warp_id_2};
}
void selection::init_axes(const analysis::layout_t& layout, IRBuilder<> &builder, Value *u_thread_id, Value *u_warp_id) {
if(layout.type == analysis::HMMA_884)
init_hmma_axes(layout, builder, u_thread_id, u_warp_id);
else
init_strided_scan_axes(layout, builder, u_thread_id, u_warp_id);
}
/* -------------------
* ---- Init Tiles ----
* ------------------- */
void selection::create_shared_tile(ir::value *v, IRBuilder<> &builder, Value *sh_mem_ptr) {
if(tmap_.find(v) != tmap_.end())
return;
auto order = layouts_->get(v).order;
auto shapes = v->get_type()->get_tile_shapes();
unsigned pad = liveness_->get_pad(v);
if(pad > 0)
shapes[order[0]] += pad;
Type* ty = llvm_type(v->get_type()->get_scalar_ty(), builder.getContext());
// shared copy
PointerType *ptr_ty = ty->getPointerTo(sh_mem_ptr->getType()->getPointerAddressSpace());
// double-buffered
if(liveness_->has_double(v)) {
auto info = liveness_->get_double(v);
ir::phi_node *phi = info.phi;
BasicBlock *parent = (BasicBlock*)vmap_[phi->get_parent()];
if(parent->empty())
builder.SetInsertPoint(parent);
else
builder.SetInsertPoint(&*parent->getFirstInsertionPt());
// create double-buffered pointer
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_->offset(v)));
pre_ptr = builder.CreateBitCast(pre_ptr, ptr->getType());
Value *next_ptr = builder.CreateGEP(ptr, offset, "next_ptr");
tmap_.insert({phi, new shared_tile(ty, shapes, order, ptr, builder, offset)});
tmap_.insert({v, new shared_tile(ty, shapes, order, pre_ptr, builder)});
tmap_.insert({info.latch, new shared_tile(ty, shapes, order, next_ptr, builder)});
}
else {
size_t offset = alloc_->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, shapes, order, ptr, builder)});
}
}
void selection::create_distributed_tile(ir::value *v, IRBuilder<> &builder) {
Type* ty = llvm_type(v->get_type()->get_scalar_ty(), builder.getContext());
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] > 1){
unsigned x = a_axes_->get(v, d);
axes[d] = axes_.at(x);
}
else{
axes[d].contiguous = 1;
axes[d].values = {builder.getInt32(0)};
}
}
distributed_tile *T = new distributed_tile(ty, shapes, layouts_->get(v).order, axes, builder, false);
bool is_inserted = tmap_.insert({v, T}).second;
// constant range
if(is_inserted && dynamic_cast<ir::make_range*>(v)){
T->for_each([&](indices_t idx){
assert(idx.size() == 1);
T->set_value(idx, idx[0]);
});
}
if(is_inserted && dynamic_cast<ir::make_range_sta*>(v)){
T->for_each([&](indices_t idx){
assert(idx.size() == 1);
BinaryOperator *bin_add = dyn_cast<BinaryOperator>(idx[0]);
assert(bin_add);
Value *res = bin_add->getOperand(1);
assert(isa<Constant>(res));
T->set_value(idx, res);
});
}
}
void selection::create_tile(ir::value *v, IRBuilder<> &builder,
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, seen, sh_mem_ptr);
auto *i = dynamic_cast<ir::instruction*>(v);
if(i && storage_info.at(i->get_id()).first == SHARED && !dynamic_cast<ir::reduce_inst*>(v))
create_shared_tile(i, builder, sh_mem_ptr);
else
create_distributed_tile(v, builder);
}
void selection::init_layouts(ir::function *fn, IRBuilder<> &builder, Value *sh_mem_ptr){
// fetch linear ID
Module *mod = builder.GetInsertBlock()->getParent()->getParent();
Value *warp_size = builder.getInt32(32);
Value* u_thread_id = tgt_->get_local_id(mod, builder, 0);
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
for(auto x: layouts_->get_all())
init_axes(x.second, 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, seen, sh_mem_ptr);
}
}
/* ----------------------------
* ---- Lower Instructions ----
* ---------------------------- */
void selection::lower_masked_store(ir::masked_store_inst *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
distributed_tile* ptrs = (distributed_tile*)tmap_.at(x->get_pointer_operand());
distributed_tile* scalars = (distributed_tile*)tmap_.at(x->get_value_operand());
ir::value *mask = x->get_mask_operand();
distributed_tile* preds = (distributed_tile*)tmap_.at(mask);
ptrs->for_each([&](indices_t idx){
Value *scalar = scalars->get_value(idx);
Value *ptr = ptrs->get_value(idx);
Value *pred = preds->get_value(idx);
BasicBlock *mask_then_bb = BasicBlock::Create(ctx, "mask_then", fn);
BasicBlock *mask_done_bb = BasicBlock::Create(ctx, "mask_done", fn);
builder.CreateCondBr(pred, mask_then_bb, mask_done_bb);
builder.SetInsertPoint(mask_then_bb);
builder.CreateStore(scalar, ptr);
builder.CreateBr(mask_done_bb);
builder.SetInsertPoint(mask_done_bb);
// std::string offset = "";
// if(GetElementPtrInst *gep = dyn_cast<GetElementPtrInst>(ptr))
// if(gep->getNumIndices() == 1)
// if(ConstantInt *cst = dyn_cast<ConstantInt>(gep->idx_begin())){
// offset = " + " + std::to_string(cst->getValue().getSExtValue()*4);
// }
// FunctionType *ty = FunctionType::get(Type::getVoidTy(ctx), {pred->getType(), ptr->getType(), scalar->getType()}, false);
// std::string asm_str = "@$0 st.global.b32 [$1" + offset + "], $2;";
// InlineAsm *iasm = InlineAsm::get(ty, asm_str, "b,l,f", true);
// builder.CreateCall(iasm, {pred, ptr, scalar});
});
}
void selection::lower_store(ir::store_inst *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
distributed_tile* ptrs = (distributed_tile*)tmap_.at(x->get_pointer_operand());
tile *scalars = tmap_.at(x->get_value_operand());
// size_t ld = layouts_->order(x->get_pointer_operand())[0];
// unsigned vector_size = 2;
// // vectorize pointers
// std::map<unsigned, Value*> ptr_packets;
// ptrs->for_each([&](indices_t idx){
// unsigned linear = ptrs->get_linear_index(idx);
// unsigned id = linear / vector_size;
// if(linear % vector_size == 0) {
// Value *ptr = ptrs->get_value(idx);
// ptr = builder.CreateBitCast(ptr, PointerType::get(VectorType::get(ptr->getType()->getPointerElementType(), vector_size),
// ptr->getType()->getPointerAddressSpace()));
// ptr_packets[id] = ptr;
// }
// });
// ((shared_tile*)(scalars))->set_vector_size(vector_size);
// ((shared_tile*)(scalars))->set_return_mode(true);
// extract result element
ptrs->for_each([&](indices_t idx){
builder.CreateStore(scalars->get_value(idx), ptrs->get_value(idx));
});
}
void selection::lower_downcast(ir::downcast_inst *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
vmap_[x] = tmap_[x->get_operand(0)]->get_value({builder.getInt32(0)});
}
void selection::lower_reduce(ir::reduce_inst *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
ir::instruction *ins = (ir::instruction*)x;
Module *module = fn->getParent();
std::map<indices_t, Value*> partial;
ir::value *op = x->get_operand(0);
distributed_tile* op_tile = (distributed_tile*)tmap_.at(op);
unsigned axis = x->get_axis();
// reduce within thread
op_tile->for_each([&](indices_t idx) {
indices_t pidx = idx;
pidx.erase(pidx.begin() + axis);
Value *current = op_tile->get_value(idx);
// current partial result is not initialized -- create
if(partial.find(pidx) == partial.end())
partial[pidx] = current;
// current partial result is initialized -- accumulate
else
partial[pidx] = builder.CreateFAdd(partial[pidx], current);
});
// reduce within blocks
unsigned addr_space = sh_mem_ptr_->getType()->getPointerAddressSpace();
Type *res_ty = builder.getFloatTy();
Value *base_ptr = builder.CreateBitCast(sh_mem_ptr_, PointerType::get(res_ty, addr_space));
for(auto& x: partial) {
// current element being computed
Value *lane = axes_.at(a_axes_->get(op, axis)).thread_id;
Value *&result = x.second;
indices_t write_idx = x.first;
write_idx.insert(write_idx.begin() + axis, lane);
// shared memory write pointer
Value *write_offset = shared_tile::shared_offset(builder, op_tile->get_shapes(), {0, 1}, op_tile->get_order(), write_idx);
Value *write_ptr = builder.CreateGEP(base_ptr, write_offset);
// initialize shared memory
tgt_->add_barrier(module, builder);
builder.CreateStore(result, write_ptr);
// build result
unsigned depth = layouts_->get(op).wpt.at(axis);
for(unsigned i = depth/2; i > 0; i >>= 1){
// current indices
indices_t current(write_idx.size(), builder.getInt32(0));
current[axis] = builder.getInt32(i);
// shared memory offset
Value *read_offset = shared_tile::shared_offset(builder, op_tile->get_shapes(), {0, 1}, op_tile->get_order(), current);
Value *is_active = builder.CreateICmpULT(lane, builder.getInt32(i));
read_offset = builder.CreateSelect(is_active, read_offset, builder.getInt32(0));
// shared memory read pointer
Value *read_ptr = builder.CreateGEP(write_ptr, read_offset);
tgt_->add_barrier(module, builder);
Value *next = builder.CreateLoad(read_ptr);
// accumulate
result = builder.CreateFAdd(result, next);
// write back
builder.CreateStore(result, write_ptr);
}
// result is on the first lane of shared memory
indices_t final = write_idx;
final[axis] = builder.getInt32(0);
Value *read_offset = shared_tile::shared_offset(builder, op_tile->get_shapes(), {0, 1}, op_tile->get_order(), final);
Value *read_ptr = builder.CreateGEP(base_ptr, read_offset);
tgt_->add_barrier(module, builder);
result = builder.CreateLoad(read_ptr);
if(tmap_.find(ins) == tmap_.end())
vmap_[ins] = result;
else{
distributed_tile *ti = (distributed_tile*)tmap_[ins];
ti->set_value(x.first, result);
}
}
}
void selection::lower_dynamic_program_idx(ir::make_range_dyn *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
distributed_tile* result = (distributed_tile*)tmap_.at(x);
result->for_each([&](indices_t idx){
assert(idx.size() == 1);
BinaryOperator *bin_add = dyn_cast<BinaryOperator>(idx[0]);
assert(bin_add);
Value *res = bin_add->getOperand(0);
result->set_value(idx, res);
});
}
void selection::lower_reshape(ir::reshape_inst* x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
distributed_tile* result = (distributed_tile*)tmap_.at(x);
ir::value* in = x->get_operand(0);
distributed_tile *in_tile = (distributed_tile*)tmap_.at(in);
result->for_each([&](indices_t out_idx){
unsigned pos = result->get_linear_index(out_idx);
indices_t in_idx = in_tile->get_ordered_indices(pos);
result->set_value(out_idx, in_tile->get_value(in_idx));
});
}
void selection::lower_splat(ir::splat_inst *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
distributed_tile* result = (distributed_tile*)tmap_.at(x);
result->for_each([&](indices_t idx) {
result->set_value(idx, llvm_value(x->get_operand(0), builder));
});
}
void selection::lower_broadcast(ir::broadcast_inst *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
distributed_tile* result = (distributed_tile*)tmap_.at(x);
ir::value* in = x->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] == 1)
in_idx[k] = builder.getInt32(0);
}
result->set_value(out_idx, in_tile->get_value(in_idx));
});
}
void selection::lower_copy_to_shared(ir::copy_to_shared_inst *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
unsigned vector_size = 1;
auto x_order = layouts_->get(x).order;
ir::value *arg = x->get_operand(0);
auto arg_order = layouts_->get(arg).order;
// tiles
shared_tile* result = (shared_tile*)tmap_.at(x);
distributed_tile* in = (distributed_tile*)tmap_.at(arg);
if(x_order == arg_order){
size_t ld = arg_order[0];
vector_size = std::min(layouts_->get(x).nts.at(ld), layouts_->get(arg).nts.at(ld));
}
std::map<unsigned, Value*> packets;
in->for_each([&](indices_t idx){
unsigned linear = in->get_linear_index(idx);
unsigned id = linear / vector_size;
Value *in_value = in->get_value(idx);
if(linear % vector_size == 0)
packets[id] = UndefValue::get(VectorType::get(in_value->getType(), vector_size));
packets[id] = builder.CreateInsertElement(packets.at(id), in_value, linear % vector_size);
});
in->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]);
});
}
void selection::lower_trans(ir::trans_inst *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
shared_tile* in = (shared_tile*)tmap_.at(x->get_operand(0));
shared_tile* out = new shared_tile(in->get_ty(), in->get_shapes(), in->get_order(), in->get_pointer(), builder, in->get_offset(), x->get_perm());
tmap_[x] = out;
}
bool is_trans(ir::value *v) {
if(dynamic_cast<ir::trans_inst *>(v)) {
return true;
}
if(auto *phi = dynamic_cast<ir::instruction *>(v)) {
bool result = true;
for(ir::value *op: phi->ops())
result = result && is_trans(op);
return result;
}
return false;
}
void selection::lower_hmma_dot(ir::dot_inst *dot, LLVMContext &ctx, Function *fn, IRBuilder<> &builder,
distributed_tile *TC, shared_tile *TA, shared_tile *TB, distributed_tile *TD, unsigned NK) {
const auto& shapes = dot->get_type()->get_tile_shapes();
TA->set_vector_size(4*pack_size_0_);
TB->set_vector_size(4*pack_size_1_);
TA->set_return_mode(true);
TB->set_return_mode(true);
std::map<std::vector<Value*>, std::vector<Value*>> fcs;
TC->for_each([&](indices_t idx){
std::vector<Value*> key(idx.size() - 2);
std::copy(idx.begin() + 2, idx.end(), key.begin());
fcs[key].push_back(TD->get_value(idx));
});
Type *fp32_ty = builder.getFloatTy();
Type *fp16x2_ty = VectorType::get(builder.getHalfTy(), 2);
Type *fp32_pack8_ty = StructType::get(ctx, {fp32_ty, fp32_ty, fp32_ty, fp32_ty, fp32_ty, fp32_ty, fp32_ty, fp32_ty});
FunctionType *mma_ty = FunctionType::get(fp32_pack8_ty, {fp16x2_ty, fp16x2_ty, fp16x2_ty, fp16x2_ty, fp32_ty, fp32_ty, fp32_ty, fp32_ty, fp32_ty, fp32_ty, fp32_ty, fp32_ty}, false);
Value *offset_a_i = offset_a_i_;
Value *offset_a_k = offset_a_k_;
Value *offset_b_j = offset_b_j_;
Value *offset_b_k = offset_b_k_;
Value* u_thread_id = tgt_->get_local_id(builder.GetInsertBlock()->getModule(), builder, 0);
auto ord_a = layouts_->get(dot->get_operand(0)).order;
auto ord_b = layouts_->get(dot->get_operand(1)).order;
bool is_a_trans = is_trans(dot->get_operand(0));
bool is_b_trans = is_trans(dot->get_operand(1));
bool is_a_row = is_a_trans ^ (ord_a[ord_a.size() - 2] == 1);
bool is_b_row = is_b_trans ^ (ord_b[ord_b.size() - 2] == 1);
if(is_a_row){
offset_a_i = builder.CreateAdd(offset_a_i, builder.CreateURem(u_thread_id, builder.getInt32(4)));
offset_a_k = builder.getInt32(0);
}
if(!is_b_row){
offset_b_j = builder.CreateAdd(offset_b_j, builder.CreateURem(u_thread_id, builder.getInt32(4)));
offset_b_k = builder.getInt32(0);
}
std::string op_a = is_a_row ? "row" : "col";
std::string op_b = is_b_row ? "row" : "col";
InlineAsm *mma_fn = InlineAsm::get(mma_ty, " mma.sync.aligned.m8n8k4." + op_a + "." + op_b + ".f32.f16.f16.f32 "
"{$0, $1, $2, $3, $4, $5, $6, $7}, "
"{$8, $9}, "
"{$10, $11}, "
"{$0, $1, $2, $3, $4, $5, $6, $7};", "=f,=f,=f,=f,=f,=f,=f,=f,r,r,r,r,0,1,2,3,4,5,6,7", false);
unsigned fpw_0 = layouts_->get(dot).fpw.at(0);
unsigned fpw_1 = layouts_->get(dot).fpw.at(1);
unsigned wts_0 = fpw_0 * 8;
unsigned wts_1 = fpw_1 * 8;
unsigned wpt_0 = layouts_->get(dot).wpt.at(0);
unsigned wpt_1 = layouts_->get(dot).wpt.at(1);
unsigned stride_rep_i = wpt_0 * wts_0;
unsigned stride_rep_j = wpt_1 * wts_1;
unsigned num_rep_i = shapes[0] / stride_rep_i;
unsigned ld_fc = num_rep_i * 2;
for(auto& x: fcs){
std::vector<Value *>& fc = x.second;
for(unsigned pack_i = 0; pack_i < num_packs_0_; pack_i++)
for(unsigned pack_j = 0; pack_j < num_packs_1_; pack_j++){
for(unsigned K = 0; K < NK; K += 4){
Value *_K = builder.getInt32(K);
Value *current_offset_a_i = builder.CreateAdd(offset_a_i, builder.getInt32(pack_i*stride_rep_i*pack_size_0_));
Value *current_offset_b_i = builder.CreateAdd(offset_b_j, builder.getInt32(pack_j*stride_rep_j*pack_size_1_));
indices_t idx_a = {current_offset_a_i, builder.CreateAdd(offset_a_k, _K)};
indices_t idx_b = {builder.CreateAdd(offset_b_k, _K), current_offset_b_i};
idx_a.insert(idx_a.end(), x.first.begin(), x.first.end());
idx_b.insert(idx_b.end(), x.first.begin(), x.first.end());
Value *ha = TA->get_value(idx_a);
Value *hb = TB->get_value(idx_b);
for(unsigned ii = 0; ii < pack_size_0_; ii++)
for(unsigned jj = 0; jj < pack_size_1_; jj++){
Value *ha0 = builder.CreateBitCast(builder.CreateExtractElement(ha, builder.getInt32(ii*pack_size_0_ + 0)), fp16x2_ty);
Value *ha1 = builder.CreateBitCast(builder.CreateExtractElement(ha, builder.getInt32(ii*pack_size_0_ + 1)), fp16x2_ty);
Value *hb0 = builder.CreateBitCast(builder.CreateExtractElement(hb, builder.getInt32(jj*pack_size_0_ + 0)), fp16x2_ty);
Value *hb1 = builder.CreateBitCast(builder.CreateExtractElement(hb, builder.getInt32(jj*pack_size_0_ + 1)), fp16x2_ty);
std::vector<size_t> idx = {
(pack_i*2*pack_size_0_ + ii*2 + 0) + (pack_j*4*pack_size_1_ + jj*4 + 0)*ld_fc,
(pack_i*2*pack_size_0_ + ii*2 + 0) + (pack_j*4*pack_size_1_ + jj*4 + 1)*ld_fc,
(pack_i*2*pack_size_0_ + ii*2 + 1) + (pack_j*4*pack_size_1_ + jj*4 + 0)*ld_fc,
(pack_i*2*pack_size_0_ + ii*2 + 1) + (pack_j*4*pack_size_1_ + jj*4 + 1)*ld_fc,
(pack_i*2*pack_size_0_ + ii*2 + 0) + (pack_j*4*pack_size_1_ + jj*4 + 2)*ld_fc,
(pack_i*2*pack_size_0_ + ii*2 + 0) + (pack_j*4*pack_size_1_ + jj*4 + 3)*ld_fc,
(pack_i*2*pack_size_0_ + ii*2 + 1) + (pack_j*4*pack_size_1_ + jj*4 + 2)*ld_fc,
(pack_i*2*pack_size_0_ + ii*2 + 1) + (pack_j*4*pack_size_1_ + jj*4 + 3)*ld_fc
};
Value *nc = builder.CreateCall(mma_fn, {ha0, ha1, hb0, hb1, fc[idx[0]], fc[idx[1]], fc[idx[2]], fc[idx[3]], fc[idx[4]], fc[idx[5]], fc[idx[6]], fc[idx[7]]});
fc[idx[0]] = builder.CreateExtractValue(nc, {0});
fc[idx[1]] = builder.CreateExtractValue(nc, {1});
fc[idx[2]] = builder.CreateExtractValue(nc, {2});
fc[idx[3]] = builder.CreateExtractValue(nc, {3});
fc[idx[4]] = builder.CreateExtractValue(nc, {4});
fc[idx[5]] = builder.CreateExtractValue(nc, {5});
fc[idx[6]] = builder.CreateExtractValue(nc, {6});
fc[idx[7]] = builder.CreateExtractValue(nc, {7});
}
}
}
}
// write back
unsigned i = 0;
TC->for_each([&](indices_t idx){
std::vector<Value*> key(idx.size() - 2);
std::copy(idx.begin() + 2, idx.end(), key.begin());
if(i >= fcs.at(key).size())
i = 0;
TC->set_value(idx, fcs.at(key)[i++]);
});
TA->set_return_mode(false);
TB->set_return_mode(false);
}
void selection::lower_scanline_dot(ir::dot_inst *dot, LLVMContext &ctx, Function *fn, IRBuilder<> &builder,
distributed_tile *TC, shared_tile *TA, shared_tile *TB, distributed_tile *TD, unsigned NK,
Type *c_ty, Function *f_mul_add) {
TA->set_vector_size(TC->axis(0).contiguous);
TB->set_vector_size(TC->axis(1).contiguous);
TC->for_each([&](indices_t idx){
Value *res = TD->get_value(idx);
for(unsigned K = 0; K < NK; ++K){
// input indices
indices_t a_idx = {idx[0], builder.getInt32(K)};
indices_t b_idx = {builder.getInt32(K), idx[1]};
// add batching dimension
for(size_t i = 2; i < idx.size(); i++){
a_idx.insert(a_idx.end(), idx[i]);
b_idx.insert(b_idx.end(), idx[i]);
}
// load value
Value *a = TA->get_value(a_idx);
Value *b = TB->get_value(b_idx);
if(a->getType() != c_ty)
a = builder.CreateFPCast(a, c_ty);
if(b->getType() != c_ty)
b = builder.CreateFPCast(b, c_ty);
res = builder.CreateCall(f_mul_add, {a, b, res});
}
TC->set_value(idx, res);
});
}
void selection::lower_outer_dot(ir::dot_inst *dot, LLVMContext &ctx, Function *fn, IRBuilder<> &builder,
distributed_tile *TC, distributed_tile *TA, distributed_tile *TB, distributed_tile *TD,
Type *c_ty, Function *f_mul_add) {
TC->for_each([&](indices_t idx){
Value *res = TD->get_value(idx);
indices_t a_idx = {idx[0], builder.getInt32(0)};
indices_t b_idx = {builder.getInt32(0), idx[1]};
std::swap(a_idx[0], a_idx[1]);
std::swap(b_idx[0], b_idx[1]);
Value *a = TA->get_value(a_idx);
Value *b = TB->get_value(b_idx);
if(a->getType() != c_ty)
a = builder.CreateFPCast(a, c_ty);
if(b->getType() != c_ty)
b = builder.CreateFPCast(b, c_ty);
res = builder.CreateCall(f_mul_add, {a, b, res});
TC->set_value(idx, res);
});
}
void selection::lower_dot(ir::dot_inst *dot, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
distributed_tile* TC = (distributed_tile*)tmap_.at(dot);
Module *module = fn->getParent();
ir::value *A = dot->get_operand(0);
ir::value *B = dot->get_operand(1);
ir::value *D = dot->get_operand(2);
distributed_tile *TD = (distributed_tile*)tmap_.at(D);
Type *c_ty = llvm_type(D->get_type()->get_scalar_ty(), ctx);
Function *f_mul_add = Intrinsic::getDeclaration(module, Intrinsic::fmuladd, {c_ty});
auto A_shapes = A->get_type()->get_tile_shapes();
size_t red_axis = 1;
unsigned NK = A_shapes[red_axis];
if(NK != 1) {
shared_tile *TA = (shared_tile*)tmap_.at(A);
shared_tile *TB = (shared_tile*)tmap_.at(B);
if(layouts_->get(dot).type == analysis::HMMA_884)
lower_hmma_dot(dot, ctx, fn, builder, TC, TA, TB, TD, NK);
else
lower_scanline_dot(dot, ctx, fn, builder, TC, TA, TB, TD, NK, c_ty, f_mul_add);
}
else {
distributed_tile *TA = (distributed_tile*)tmap_.at(A);
distributed_tile *TB = (distributed_tile*)tmap_.at(B);
lower_outer_dot(dot, ctx, fn, builder, TC, TA, TB, TD, c_ty, f_mul_add);
}
}
void selection::lower_masked_load(ir::masked_load_inst *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
// find vector size
distributed_tile* result = (distributed_tile*)tmap_.at(x);
ir::value *ptr = x->get_pointer_operand();
size_t ld = layouts_->get(ptr).order[0];
unsigned alignment = alignment_->get(ptr, ld);
unsigned vector_size = std::min<unsigned>(result->axis(ld).contiguous, alignment);
distributed_tile *pointers = (distributed_tile*)tmap_.at(ptr);
distributed_tile *masks = (distributed_tile*)tmap_.at(x->get_mask_operand());
distributed_tile *false_values = (distributed_tile*)tmap_.at(x->get_false_value_operand());
std::map<unsigned, Value*> packets;
result->for_each([&](indices_t idx){
unsigned linear = result->get_linear_index(idx);
unsigned id = linear / vector_size;
if(linear % vector_size == 0) {
Value *ptr = pointers->get_value(idx);
ptr = builder.CreateBitCast(ptr, PointerType::get(VectorType::get(result->get_ty(), vector_size),
ptr->getType()->getPointerAddressSpace()));
Value *mask = masks->get_value(idx);
BasicBlock *current_bb = builder.GetInsertBlock();
BasicBlock *mask_then_bb = BasicBlock::Create(ctx, "mask_then", fn);
BasicBlock *mask_done_bb = BasicBlock::Create(ctx, "mask_done", fn);
builder.CreateCondBr(mask, mask_then_bb, mask_done_bb);
builder.SetInsertPoint(mask_then_bb);
Value *result_then = builder.CreateLoad(ptr);
builder.CreateBr(mask_done_bb);
builder.SetInsertPoint(mask_done_bb);
Value *current_result = nullptr;
if(false_values){
current_result = builder.CreatePHI(result_then->getType(), 2);
((PHINode*)current_result)->addIncoming(result_then, mask_then_bb);
Value *result_false = false_values->get_value(idx);
if(result_then->getType()->isVectorTy())
result_false = builder.CreateVectorSplat(vector_size, llvm::UndefValue::get(result_false->getType()));
((PHINode*)current_result)->addIncoming(result_false, current_bb);
}
else
current_result = result_then;
// ConstantInt *cst = nullptr;
// if(GetElementPtrInst *gep = dyn_cast<GetElementPtrInst>(ptr))
// if(gep->getNumIndices() == 1)
// cst = dyn_cast<ConstantInt>(gep->idx_begin());
// llvm::Value* mask = masks->get_value(idx);
// std::string offset = "";
// if(cst)
// offset = " + " + std::to_string(cst->getValue().getSExtValue()*2*vector_size);
// Type *fp16x2_ty = VectorType::get(builder.getHalfTy(), 2);
// Type *fp16x2_pack4_ty = StructType::get(ctx, {fp16x2_ty, fp16x2_ty, fp16x2_ty, fp16x2_ty});
// FunctionType *ty = FunctionType::get(fp16x2_pack4_ty, {mask->getType(), ptr->getType()}, false);
// std::string asm_str = "@$0 ld.global.nc.b32 {$1, $2, $3, $4}, [$5" + offset + "];";
// if(false_values)
// asm_str += "\n\t@!$0 mov.v4.b32 {$1, $2, $3, $4}, {0, 0, 0, 0};";
// InlineAsm *iasm = InlineAsm::get(ty, asm_str, "b,=r,=r,=r,=r,l", true);
// Value *current_result = builder.CreateCall(iasm, {mask, ptr});
packets[id] = current_result;
}
});
// extract result element
result->for_each([&](indices_t idx){
unsigned linear = result->get_linear_index(idx);
unsigned id = linear / vector_size;
// Value *tmp = builder.CreateExtractValue(packets.at(id), {(linear % vector_size) / 2});
// Value *res = builder.CreateExtractElement(tmp, (linear % vector_size) % 2);
// result->set_value(idx, res);
result->set_value(idx, builder.CreateExtractElement(packets.at(id), linear % vector_size));
});
}
void selection::lower_load(ir::load_inst *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
distributed_tile* result = (distributed_tile*)tmap_.at(x);
// find vector size
ir::value *ptr = x->get_pointer_operand();
size_t ld = layouts_->get(ptr).order[0];
unsigned alignment = alignment_->get(ptr, ld);
unsigned vector_size = std::min<unsigned>(result->axis(ld).contiguous, alignment);
distributed_tile *pointers = (distributed_tile*)tmap_.at(ptr);
// vector loads
std::map<unsigned, Value*> packets;
result->for_each([&](indices_t idx){
unsigned linear = result->get_linear_index(idx);
unsigned id = linear / vector_size;
if(linear % vector_size == 0) {
Value *ptr = pointers->get_value(idx);
ptr = builder.CreateBitCast(ptr, PointerType::get(VectorType::get(result->get_ty(), vector_size),
ptr->getType()->getPointerAddressSpace()));
packets[id] = builder.CreateLoad(ptr);
}
});
// extract result element
result->for_each([&](indices_t idx){
unsigned linear = result->get_linear_index(idx);
unsigned id = linear / vector_size;
result->set_value(idx, builder.CreateExtractElement(packets.at(id), linear % vector_size));
});
}
void selection::lower_elementwise(ir::instruction *x, LLVMContext &ctx, Function *fn, IRBuilder<> &builder) {
distributed_tile* result = (distributed_tile*)tmap_.at(x);
result->for_each([&](indices_t idx){
auto value = [&](ir::value *v) {
if(auto *cst = dynamic_cast<ir::constant_int*>(v))
return (Value*)llvm_constant(cst, ctx);
else if(v->get_type()->is_tile_ty())
return tmap_.at(v)->get_value(idx);
else
return llvm_value(v, builder);
};
result->set_value(idx, llvm_inst(x, value, builder));
});
}
void selection::lower_tile_instruction(ir::instruction *ins, llvm::IRBuilder<> &builder) {
BasicBlock *block = builder.GetInsertBlock();
LLVMContext &ctx = builder.getContext();
Function *fn = block->getParent();
if(auto *x = dynamic_cast<ir::masked_store_inst*>(ins))
lower_masked_store(x, ctx, fn, builder);
else if(auto *x = dynamic_cast<ir::store_inst*>(ins))
lower_store(x, ctx, fn, builder);
else if(auto *x = dynamic_cast<ir::downcast_inst*>(ins))
lower_downcast(x, ctx, fn, builder);
else if(auto *x = dynamic_cast<ir::reduce_inst*>(ins))
lower_reduce(x, ctx, fn, builder);
else if(auto *x = dynamic_cast<ir::make_range_dyn*>(ins))
lower_dynamic_program_idx(x, ctx, fn, builder);
else if(auto *x = dynamic_cast<ir::reshape_inst*>(ins))
lower_reshape(x, ctx, fn, builder);
else if(auto *x = dynamic_cast<ir::splat_inst*>(ins))
lower_splat(x, ctx, fn, builder);
else if(auto *x = dynamic_cast<ir::broadcast_inst*>(ins))
lower_broadcast(x, ctx, fn, builder);
else if(auto *x = dynamic_cast<ir::copy_to_shared_inst*>(ins))
lower_copy_to_shared(x, ctx, fn, builder);
else if(auto* x = dynamic_cast<ir::trans_inst*>(ins))
lower_trans(x, ctx, fn, builder);
else if(auto x = dynamic_cast<ir::dot_inst*>(ins))
lower_dot(x, ctx, fn, builder);
else if(auto *x = dynamic_cast<ir::masked_load_inst*>(ins))
lower_masked_load(x, ctx, fn, builder);
else if(auto *x = dynamic_cast<ir::load_inst*>(ins))
lower_load(x, ctx, fn, builder);
else if(!dynamic_cast<shared_tile*>(tmap_.at(ins)))
lower_elementwise(ins, ctx, fn, 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;
}
}
/* ----------------------------
* ---- Generate LLVM code ----
* ---------------------------- */
inline llvm::Attribute llvm_attr(llvm::LLVMContext& ctx, ir::attribute attr) {
switch(attr.get_kind()){
case ir::noalias: return llvm::Attribute::get(ctx, llvm::Attribute::NoAlias);
case ir::readonly: return llvm::Attribute::get(ctx, llvm::Attribute::ReadOnly);
case ir::writeonly: return llvm::Attribute::get(ctx, llvm::Attribute::WriteOnly);
case ir::aligned: return llvm::Attribute::get(ctx, llvm::Attribute::Alignment, attr.get_value());
default: throw std::runtime_error("cannot convert ir::attribute_t to llvm::Attribute");
}
}
ArrayType* selection::llvm_linearized_tile_type(ir::type *ty, LLVMContext &ctx) {
unsigned size = 1;
for(auto shape: ty->get_tile_shapes())
size *= shape;
return ArrayType::get(llvm_type(ty->get_scalar_ty(), ctx), size);
}
Function* selection::llvm_fn(ir::function *fn, IRBuilder<>& builder, Module& dst) {
LLVMContext &ctx = builder.getContext();
FunctionType *fn_ty = (FunctionType*)llvm_type(fn->get_fn_type(), ctx);
FunctionType *dst_fn_ty = fn_ty;
if(!tgt_->is_gpu()){
Type *dst_fn_ret_ty = fn_ty->getReturnType();
std::vector<Type*> dst_fn_args_ty;
for(unsigned i = 0; i < fn_ty->getNumParams(); i++)
dst_fn_args_ty.push_back(fn_ty->getParamType(i));
dst_fn_args_ty.push_back(builder.getInt32Ty());
dst_fn_args_ty.push_back(builder.getInt32Ty());
dst_fn_args_ty.push_back(builder.getInt32Ty());
dst_fn_ty = FunctionType::get(dst_fn_ret_ty, dst_fn_args_ty, false);
}
Function *ret = Function::Create(dst_fn_ty, Function::ExternalLinkage, fn->get_name(), &dst);
// set attributes
for(auto attr_pair: fn->attrs()){
unsigned id = attr_pair.first;
for(ir::attribute attr: attr_pair.second)
if(attr.is_llvm_attr())
ret->addAttribute(id, llvm_attr(ctx, attr));
}
// set metadata
tgt_->set_kernel(builder, ctx, &dst, ret);
Metadata *md_args[] = {
ValueAsMetadata::get(ret),
MDString::get(ctx, "maxntidx"),
ValueAsMetadata::get(builder.getInt32(num_warps_*32))
};
dst.getOrInsertNamedMetadata("nvvm.annotations")->addOperand(MDNode::get(ctx, md_args));
// map parameters
for(unsigned i = 0; i < fn->args().size(); i++)
vmap_[fn->args()[i]] = &*(ret->arg_begin() + i);
// create blocks
for(ir::basic_block *block: fn->blocks()) {
BasicBlock *dst_block = BasicBlock::Create(ctx, block->get_name(), ret);
vmap_[block] = dst_block;
}
builder.SetInsertPoint((BasicBlock*)vmap_[fn->blocks()[0]]);
}
Value* selection::alloc_shared(IRBuilder<> &builder, Module& dst) {
Value *ret = nullptr;
LLVMContext &ctx = builder.getContext();
if(tgt_->is_gpu())
if(unsigned alloc_size = alloc_->allocated_size()){
Type *int_8_ty = Type::getInt8Ty(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, array_ty, false, GlobalVariable::ExternalLinkage,
nullptr, "__shared_ptr", nullptr, GlobalVariable::NotThreadLocal, 3);
ret = builder.CreateBitCast(sh_mem_array, ptr_ty);
}
return ret;
}
void selection::run(ir::module &src, Module &dst) {
vmap_.clear();
tmap_.clear();
LLVMContext &dst_ctx = dst.getContext();
IRBuilder<> dst_builder(dst_ctx);
// constant memory
for(ir::alloc_const *x: src.allocs())
vmap_[x] = llvm_alloc_const(x, &dst, dst_builder);
// iterate over functions
for(ir::function *fn: src.get_function_list()) {
// create LLVM function
llvm_fn(fn, dst_builder, dst);
// allocate shared memory
sh_mem_ptr_ = alloc_shared(dst_builder, dst);
// initialize layouts
init_layouts(fn, dst_builder, sh_mem_ptr_);
// generate LLVM-IR code
std::map<ir::basic_block*, BasicBlock*> last_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()){
BasicBlock *current = dst_builder.GetInsertBlock();
bool phi_inserted = (dynamic_cast<ir::phi_node*>(i)) && !current->empty();
if(phi_inserted && current->getFirstNonPHI())
dst_builder.SetInsertPoint(&*current->getFirstNonPHI());
lower_instruction(i, dst_builder);
if(phi_inserted && current->getFirstNonPHI())
dst_builder.SetInsertPoint(current);
last_block[block] = dst_builder.GetInsertBlock();
}
}
// finalize double-buffering
for(ir::basic_block *block: fn->blocks())
for(ir::instruction *inst: block->get_inst_list()) {
if(liveness_->has_double(inst)) {
auto info = liveness_->get_double(inst);
ir::phi_node *phi = info.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::basic_block* inc_block = phi->get_incoming_block(n);
ir::value* inc_val = phi->get_incoming_value(n);
BasicBlock *llvm_inc_block = last_block.at(inc_block);
shared_tile *inc_shared = (shared_tile*)tmap_.at(inc_val);
if(inc_val == info.latch){
dst_builder.SetInsertPoint(llvm_inc_block->getTerminator());
Value *next_offset = dst_builder.CreateNeg(offset);
offset->addIncoming(next_offset, llvm_inc_block);
}
else {
unsigned num_bytes = inst->get_type()->get_scalar_ty()->get_primitive_size_in_bits() / 8;
offset->addIncoming(dst_builder.getInt32(liveness_->get_buffer(inst)->size / (2*num_bytes)), llvm_inc_block);
}
ptr->addIncoming(inc_shared->get_pointer(), llvm_inc_block);
}
}
}
// finalize phi
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(tmap_.find(phi) == tmap_.end() ||
!dynamic_cast<shared_tile*>(tmap_.at(phi))) {
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*)llvm_value(phi, dst_builder);
Value *llvm_inc_val = llvm_value(inc_val, dst_builder);
llvm_phi->addIncoming(llvm_inc_val, llvm_inc_block);
}
}
}
}
}
}
}
}
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