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triton/lib/codegen/selection.cc

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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");
}
Type *type(ir::type *ty, LLVMContext &ctx) {
// function
if(auto* tt = dynamic_cast<ir::function_type*>(ty)){
Type *return_ty = type(tt->get_return_ty(), ctx);
std::vector<Type*> param_tys;
std::transform(tt->params_begin(), tt->params_end(), std::back_inserter(param_tys),
[&ctx](ir::type* t){ return type(t, ctx);});
return FunctionType::get(return_ty, param_tys, false);
}
// pointer
if(ty->is_pointer_ty()){
Type *elt_ty = 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");
}
/* -------------------
* ---- Init Axes ----
* ------------------- */
// Grid construction
std::vector<Value*> delinearize(Value *trailing, const std::vector<int>& order, std::vector<int> &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;
}
/* -------------------
* ---- Init Tiles ----
* ------------------- */
void selection::create_shared_tile(ir::value *v, IRBuilder<> &builder, Value *sh_mem_ptr) {
if(tmap_.find(v) != tmap_.end())
return;
analysis::layout_shared_t *layout = (analysis::layout_shared_t*)layouts_->get(v);
auto order = layout->order;
auto shapes = layout->shapes;
shapes[order[0]] += layout->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(layout->double_buffer) {
auto info = *layout->double_buffer;
ir::phi_node *phi = info.phi;
BasicBlock *parent = (BasicBlock*)vmap_[phi->get_parent()];
if(parent->empty())
builder.SetInsertPoint(parent);
else
builder.SetInsertPoint(&*parent->getFirstNonPHI());
// 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)});
}
}
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_value(ir::value *src, IRBuilder<> &builder, generator* gen, std::set<ir::value*>& seen) {
if(!seen.insert(src).second)
return;
BasicBlock *current = builder.GetInsertBlock();
if(src->get_type()->is_tile_ty()){
builder.SetInsertPoint(&*builder.GetInsertBlock()->getParent()->begin());
auto *i = dynamic_cast<ir::instruction*>(src);
if(i && layouts_->get(i)->type == analysis::SHARED)
create_shared_tile(i, builder, sh_mem_ptr_);
else
tmap_[src] = ((machine_layout_distributed_t*)gen->get_machine_layout(layouts_->get(src)))->create(src);
}
builder.SetInsertPoint(current);
auto *inst = dynamic_cast<ir::instruction*>(src);
if(inst && !dynamic_cast<ir::phi_node*>(src))
for(ir::value *op: inst->ops())
lower_value(op, builder, gen, seen);
builder.SetInsertPoint(current);
auto *phi = dynamic_cast<ir::phi_node*>(src);
if(phi && !current->empty() && current->getFirstNonPHI())
builder.SetInsertPoint(&*current->getFirstNonPHI());
if(auto *usr = dynamic_cast<ir::user*>(src))
usr->accept(gen);
if(phi && !current->empty() && current->getFirstNonPHI())
builder.SetInsertPoint(current);
}
/* ----------------------------
* ---- 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");
}
}
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);
// allocate shared memory
sh_mem_ptr_ = alloc_shared(dst_builder, dst);
// iterate over functions
std::set<ir::value*> seen;
// create tile
generator gen(&dst_ctx, &dst, &dst_builder, a_axes_, axes_, vmap_, tmap_, tgt_, layouts_, alignment_, alloc_, sh_mem_ptr_,
offset_a_i_, offset_a_k_, offset_b_j_, offset_b_k_, num_packs_0_, num_packs_1_, pack_size_0_, pack_size_1_, num_warps_ );
for(ir::alloc_const *x: src.allocs())
x->accept(&gen);
for(ir::function *fn: src.get_function_list()) {
fn->accept(&gen);
// initialize layouts
for(auto x: layouts_->get_all())
x.second->accept(&gen);
// 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())
lower_value(i, dst_builder, &gen, seen);
last_block[block] = dst_builder.GetInsertBlock();
}
// finalize double-buffering
for(const auto& x: layouts_->get_all()) {
if(x.second->double_buffer) {
auto info = *x.second->double_buffer;
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 = x.second->ty->get_primitive_size_in_bits() / 8;
offset->addIncoming(dst_builder.getInt32(x.second->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*)vmap_.at(phi);
Value *llvm_inc_val = vmap_.at(inc_val);
llvm_phi->addIncoming(llvm_inc_val, llvm_inc_block);
}
}
}
}
}
}
void generator::visit_phi_node(ir::phi_node* phi) {
Type *ty = type(phi->get_type()->get_scalar_ty(), *ctx_);
unsigned num_ops = phi->get_num_operands();
for_each(phi, [&](indices_t idx){
set_value(phi, idx, builder_->Insert(PHINode::Create(ty, num_ops)));
});
}
void generator::visit_binary_operator(ir::binary_operator*binop) {
for_each(binop, [&](indices_t idx){
Value *lhs = get_value(binop->get_operand(0), idx);
Value *rhs = get_value(binop->get_operand(1), idx);
Value *ret = builder_->Insert(BinaryOperator::Create(llvm_op(binop->get_op()), lhs, rhs));
set_value(binop, idx, ret);
});
}
void generator::visit_getelementptr_inst(ir::getelementptr_inst* gep) {
for_each(gep, [&](indices_t idx){
Value *ptr = get_value(gep->get_operand(0), idx);
std::vector<Value*> idx_vals;
std::transform(gep->idx_begin(), gep->idx_end(), std::back_inserter(idx_vals),
[&](ir::value* x){ return get_value(x, idx);});
Type *source_ty = type(gep->get_source_elt_ty()->get_scalar_ty(), *ctx_);
Value *ret = builder_->Insert(GetElementPtrInst::CreateInBounds(source_ty, ptr, idx_vals));
set_value(gep, idx, ret);
});
}
void generator::visit_icmp_inst(ir::icmp_inst* icmp) {
for_each(icmp, [&](indices_t idx){
ir::cmp_pred_t pred = icmp->get_pred();
Value *lhs = get_value(icmp->get_operand(0), idx);
Value *rhs = get_value(icmp->get_operand(1), idx);
Value *ret = builder_->Insert(CmpInst::Create(Instruction::ICmp, llvm_pred(pred), lhs, rhs));
set_value(icmp, idx, ret);
});
}
void generator::visit_fcmp_inst(ir::fcmp_inst* fcmp) {
for_each(fcmp, [&](indices_t idx){
ir::cmp_pred_t pred = fcmp->get_pred();
Value *lhs = get_value(fcmp->get_operand(0), idx);
Value *rhs = get_value(fcmp->get_operand(1), idx);
Value *ret = builder_->Insert(FCmpInst::Create(Instruction::FCmp, llvm_pred(pred), lhs, rhs));
set_value(fcmp, idx, ret);
});
}
void generator::visit_cast_inst(ir::cast_inst* cast) {
for_each(cast, [&](indices_t idx){
Value *arg = get_value(cast->get_operand(0), idx);
Type *dst_ty = type(cast->get_type()->get_scalar_ty(), *ctx_);
Value *ret = builder_->Insert(CastInst::Create(llvm_op(cast->get_op()), arg, dst_ty));
set_value(cast, idx, ret);
});
}
void generator::visit_return_inst(ir::return_inst* rr) {
ir::value *ret_val = rr->get_return_value();
builder_->Insert(ReturnInst::Create(*ctx_, ret_val ? vmap_.at(ret_val) : nullptr));
}
void generator::visit_cond_branch_inst(ir::cond_branch_inst* br) {
BasicBlock *true_dest = (BasicBlock*)vmap_.at(br->get_true_dest());
BasicBlock *false_dest = (BasicBlock*)vmap_.at(br->get_false_dest());
Value *cond = vmap_.at(br->get_cond());
builder_->Insert(BranchInst::Create(true_dest, false_dest, cond));
}
void generator::visit_uncond_branch_inst(ir::uncond_branch_inst* br) {
BasicBlock *dest = (BasicBlock*)vmap_.at(br->get_dest());
builder_->Insert(BranchInst::Create(dest));
}
void generator::visit_unmasked_load_inst(ir::unmasked_load_inst* x) {
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 generator::visit_masked_load_inst(ir::masked_load_inst* x) {
// 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();
Function *parent = builder_->GetInsertBlock()->getParent();
BasicBlock *mask_then_bb = BasicBlock::Create(*ctx_, "mask_then", parent);
BasicBlock *mask_done_bb = BasicBlock::Create(*ctx_, "mask_done", parent);
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 generator::visit_unmasked_store_inst(ir::unmasked_store_inst* st) {
for_each(st->get_pointer_operand(), [&](indices_t idx){
Value *ptr = get_value(st->get_pointer_operand(), idx);
Value *val = get_value(st->get_value_operand(), idx);
builder_->CreateStore(val, ptr);
});
}
void generator::visit_masked_store_inst(ir::masked_store_inst* st) {
distributed_tile* ptrs = (distributed_tile*)tmap_.at(st->get_pointer_operand());
distributed_tile* scalars = (distributed_tile*)tmap_.at(st->get_value_operand());
ir::value *mask = st->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);
Function *parent = builder_->GetInsertBlock()->getParent();
BasicBlock *mask_then_bb = BasicBlock::Create(*ctx_, "mask_then", parent);
BasicBlock *mask_done_bb = BasicBlock::Create(*ctx_, "mask_done", parent);
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 generator::visit_reshape_inst(ir::reshape_inst* reshape) {
distributed_tile* result = (distributed_tile*)tmap_.at(reshape);
ir::value* in = reshape->get_operand(0);
distributed_tile *in_tile = (distributed_tile*)tmap_.at(in);
for_each(reshape, [&](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 generator::visit_splat_inst(ir::splat_inst* splat) {
Value *in = get_value(splat->get_operand(0), {});
for_each(splat, [&](indices_t idx){
set_value(splat, idx, in);
});
}
void generator::visit_broadcast_inst(ir::broadcast_inst* bcast) {
distributed_tile* result = (distributed_tile*)tmap_.at(bcast);
ir::value* in = bcast->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 generator::visit_downcast_inst(ir::downcast_inst* x) {
vmap_[x] = tmap_[x->get_operand(0)]->get_value({builder_->getInt32(0)});
}
void generator::visit_get_program_id_inst(ir::get_program_id_inst* pid) {
Module *module = builder_->GetInsertBlock()->getModule();
Value *ret = tgt_->get_block_id(module, *builder_, pid->get_axis());
vmap_[pid] = ret;
}
void generator::visit_get_num_program_inst(ir::get_num_program_inst* np) {
Module *module = builder_->GetInsertBlock()->getModule();
Value *ret = tgt_->get_num_blocks(module, *builder_, np->get_axis());
vmap_[np] = ret;
}
void generator::visit_atomic_cas_inst(ir::atomic_cas_inst* cas) {
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(cas)));
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 = vmap_.at(cas->get_operand(0));
Value *cas_cmp = vmap_.at(cas->get_operand(1));
Value *cas_val = vmap_.at(cas->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_);
vmap_[cas] = builder_->CreateLoad(ptr);
}
void generator::visit_atomic_exch_inst(ir::atomic_exch_inst* xchg) {
BasicBlock *current = builder_->GetInsertBlock();
Module *module = current->getModule();
Value *rmw_ptr = vmap_.at(xchg->get_operand(0));
Value *rmw_val = vmap_.at(xchg->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);
vmap_[xchg] = 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_);
}
void generator::visit_atomic_add_inst(ir::atomic_add_inst*) {
throw std::runtime_error("unsupported");
}
void generator::visit_hmma_dot(ir::dot_inst* dot, 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 generator::visit_scanline_dot(ir::dot_inst* dot, 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 generator::visit_outer_dot(ir::dot_inst*, distributed_tile *TC, distributed_tile *TA, distributed_tile *TB, distributed_tile *TD, unsigned NK,
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 generator::visit_dot_inst(ir::dot_inst* dot) {
Function *fn = builder_->GetInsertBlock()->getParent();
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 = 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)
visit_hmma_dot(dot, TC, TA, TB, TD, NK);
else
visit_scanline_dot(dot, 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);
visit_outer_dot(dot, TC, TA, TB, TD, NK, c_ty, f_mul_add);
}
}
void generator::visit_trans_inst(ir::trans_inst* trans) {
shared_tile* in = (shared_tile*)tmap_.at(trans->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(), trans->get_perm());
tmap_[trans] = out;
}
void generator::visit_sqrt_inst(ir::sqrt_inst* sqt) {
for_each(sqt, [&](indices_t idx){
Value *val = get_value(sqt->get_operand(0), idx);
Module* module = builder_->GetInsertBlock()->getModule();
Value *sqrt = Intrinsic::getDeclaration(module, Intrinsic::sqrt, {val->getType()});
Value *ret = builder_->CreateCall(sqrt, {val});
set_value(sqt, idx, ret);
});
}
void generator::visit_reduce_inst(ir::reduce_inst*) {
throw std::runtime_error("not implemented");
}
void generator::visit_select_inst(ir::select_inst* select) {
for_each(select, [&](indices_t idx){
Value *pred = get_value(select->get_operand(0), idx);
Value *if_value = get_value(select->get_operand(1), idx);
Value *else_value = get_value(select->get_operand(2), idx);
Value *ret = builder_->Insert(SelectInst::Create(pred, if_value, else_value));
set_value(select, idx, ret);
});
}
void generator::visit_copy_to_shared_inst(ir::copy_to_shared_inst* cts) {
unsigned vector_size = 1;
auto x_order = layouts_->get(cts)->order;
ir::value *arg = cts->get_operand(0);
auto arg_order = layouts_->get(arg)->order;
// tiles
shared_tile* result = (shared_tile*)tmap_.at(cts);
distributed_tile* in = (distributed_tile*)tmap_.at(arg);
if(x_order == arg_order){
size_t ld = arg_order[0];
vector_size = 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 generator::visit_copy_from_shared_inst(ir::copy_from_shared_inst* cfs) {
distributed_tile* result = (distributed_tile*)tmap_.at(cfs);
shared_tile* arg = (shared_tile*)tmap_.at(cfs->get_operand(0));
result->for_each([&](indices_t idx){
result->set_value(idx, arg->get_value(idx));
});
}
void generator::visit_barrier_inst(ir::barrier_inst*) {
Module *module = builder_->GetInsertBlock()->getModule();
tgt_->add_barrier(module, *builder_);
}
void generator::visit_make_range_dyn(ir::make_range_dyn* x) {
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 generator::visit_make_range_sta(ir::make_range_sta* x) {
distributed_tile *T = (distributed_tile *)tmap_.at(x);
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 generator::visit_make_range(ir::make_range* x) {
distributed_tile *T = (distributed_tile *)tmap_.at(x);
T->for_each([&](indices_t idx){
assert(idx.size() == 1);
T->set_value(idx, idx[0]);
});
}
void generator::visit_undef_value(ir::undef_value *ud) {
vmap_[ud] = llvm::UndefValue::get(type(ud->get_type(), *ctx_));
}
void generator::visit_constant_int(ir::constant_int *cst){
Type *ty = type(cst->get_type()->get_scalar_ty(), *ctx_);
vmap_[cst] = ConstantInt::get(ty, cst->get_value());
}
void generator::visit_constant_fp(ir::constant_fp *cst){
Type *ty = type(cst->get_type()->get_scalar_ty(), *ctx_);
vmap_[cst] = ConstantFP::get(ty, cst->get_value());
}
void generator::visit_alloc_const(ir::alloc_const *alloc) {
unsigned size = ((ir::constant_int*)alloc->get_operand(0))->get_value();
Type *element_ty = type(alloc->get_type()->get_pointer_element_ty(), *ctx_);
Type *array_ty = llvm::ArrayType::get(element_ty, size);
Value *array = new llvm::GlobalVariable(*mod_, array_ty, false, llvm::GlobalVariable::ExternalLinkage,
nullptr, alloc->get_name(), nullptr, llvm::GlobalVariable::NotThreadLocal, 4);
vmap_[alloc] = builder_->CreateBitCast(array, element_ty->getPointerTo(4));
}
void generator::visit_function(ir::function* fn) {
LLVMContext &ctx = builder_->getContext();
FunctionType *fn_ty = (FunctionType*)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(), mod_);
// 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, mod_, ret);
Metadata *md_args[] = {
ValueAsMetadata::get(ret),
MDString::get(ctx, "maxntidx"),
ValueAsMetadata::get(builder_->getInt32(num_warps_*32))
};
mod_->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]]);
fn_ = ret;
}
void generator::visit_layout_hmma_884(analysis::layout_hmma_884_t* layout) {
machine_layouts_[layout] = new machine_layout_hmma_884_t(mod_, builder_, tgt_, type(layout->ty->get_scalar_ty(), *ctx_), a_axes_, axes_,
offset_a_i_, offset_a_k_, offset_b_j_, offset_b_k_,
pack_size_0_, pack_size_1_,
num_packs_0_, num_packs_1_,
layout);
}
void generator::visit_layout_scanline(analysis::layout_scanline_t* layout) {
machine_layouts_[layout] = new machine_layout_scanline_t(mod_, builder_, tgt_, type(layout->ty->get_scalar_ty(), *ctx_), a_axes_, axes_, layout);
}
void generator::visit_layout_shared(analysis::layout_shared_t* layout) {
machine_layouts_[layout] = new machine_layout_shared_t();
}
void generator::for_each(ir::value *x, const std::function<void(indices_t)>& fn) {
if(!x->get_type()->is_tile_ty())
return fn({});
else {
if(auto *dt = dynamic_cast<distributed_tile*>(tmap_.at(x)))
dt->for_each(fn);
}
}
Value* generator::get_value(ir::value *x, const indices_t& idx) {
if(x->get_type()->is_tile_ty())
return tmap_.at(x)->get_value(idx);
return vmap_.at(x);
}
void generator::set_value(ir::value *x, const indices_t& idx, Value* v) {
if(x->get_type()->is_tile_ty())
tmap_.at(x)->set_value(idx, v);
else
vmap_[x] = v;
}
shared_tile* machine_layout_shared_t::create(ir::value *v) {
}
machine_layout_distributed_t::machine_layout_distributed_t(Module *mod, Builder *builder, target *tgt, Type *ty,
analysis::axes *a_axes, std::map<unsigned, distributed_axis>& axes,
analysis::layout_t *layout)
: mod_(mod), builder_(builder), tgt_(tgt), ty_(ty), a_axes_(a_axes), axes_(axes), layout_(layout) {
}
distributed_tile* machine_layout_distributed_t::create(ir::value *v) {
Type *ty = 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)};
}
}
return new distributed_tile(ty, shapes, layout_->order, axes, *builder_, false);
}
machine_layout_hmma_884_t::machine_layout_hmma_884_t(Module *mod, Builder *builder,
target *tgt, Type *ty, analysis::axes *a_axes,
std::map<unsigned, distributed_axis>& axes,
Value *&offset_a_i, Value *&offset_a_k, Value *&offset_b_j, Value *&offset_b_k,
unsigned &pack_size_0, unsigned &pack_size_1,
unsigned &num_packs_0, unsigned &num_packs_1,
analysis::layout_hmma_884_t* layout)
: machine_layout_distributed_t(mod, builder, tgt, ty, a_axes, axes, layout),
offset_a_i_(offset_a_i), offset_a_k_(offset_a_k), offset_b_j_(offset_b_j), offset_b_k_(offset_b_k),
pack_size_0_(pack_size_0), pack_size_1_(pack_size_1), num_packs_0_(num_packs_0), num_packs_1_(num_packs_1) {
Value *warp_size = builder_->getInt32(32);
Value* u_thread_id_0 = tgt_->get_local_id(mod_, *builder_, 0);
Value *u_thread_id = builder_->CreateURem(u_thread_id_0, warp_size);
Value *u_warp_id = builder_->CreateUDiv(u_thread_id_0, warp_size);
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};
}
machine_layout_scanline_t::machine_layout_scanline_t(Module *mod, Builder *builder,
target *tgt, Type *ty,
analysis::axes *a_axes, std::map<unsigned, distributed_axis> &axes,
analysis::layout_scanline_t* layout)
: machine_layout_distributed_t(mod, builder, tgt, ty, a_axes, axes, layout) {
Value *warp_size = builder_->getInt32(32);
Value* u_thread_id_0 = tgt_->get_local_id(mod_, *builder_, 0);
Value *u_thread_id = builder_->CreateURem(u_thread_id_0, warp_size);
Value *u_warp_id = builder_->CreateUDiv(u_thread_id_0, warp_size);
auto order = layout->order;
const auto& shapes = layout->shapes;
size_t dim = shapes.size();
std::vector<int> nts = layout->nts;
std::vector<int> mts = layout->mts;
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]};
}
}
}
}
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