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#include <torch/csrc/jit/codegen/cuda/expr_evaluator.h>
#include <torch/csrc/jit/codegen/cuda/fusion.h>
#include <torch/csrc/jit/codegen/cuda/instrumentation.h>
#include <torch/csrc/jit/codegen/cuda/ir_all_nodes.h>
#include <torch/csrc/jit/codegen/cuda/ir_iostream.h>
#include <iostream>
namespace torch {
namespace jit {
namespace fuser {
void StatefulExpressionEvaluator::safeBind(
Val* value,
Int::ScalarType concrete_value,
GpuLower* lower) {
auto already_concrete_val = getValue(value);
if (already_concrete_val.has_value()) {
TORCH_INTERNAL_ASSERT(
concrete_value == already_concrete_val.value(),
"Tried to bind ",
value,
" to ",
" concrete value, but it's already set to ",
already_concrete_val.value());
} else {
TORCH_INTERNAL_ASSERT(
value->getOrigin() == nullptr,
"Tried to bind to a value that is computed in the fusion IR. ",
"Can only bind to symbolic values to the fusion that do not have an origin expr.");
bindings_[value] = concrete_value;
}
if (lower != nullptr) {
// TODO(kir): we should not need to lower (or mutate the IR in any way)
// during expression evaluation
auto lowered_val = lower->getLowerValue(value);
already_concrete_val = getValue(lowered_val);
if (already_concrete_val.has_value()) {
TORCH_INTERNAL_ASSERT(
concrete_value == already_concrete_val.value(),
"Tried to bind ",
lowered_val,
" to ",
" concrete value, but it's already set to ",
already_concrete_val.value());
} else {
TORCH_INTERNAL_ASSERT(
lowered_val->getOrigin() == nullptr,
"Tried to bind to a value that is computed in the fusion IR. ",
"Can only bind to symbolic values to the fusion that do not have an origin expr.");
bindings_[lowered_val] = concrete_value;
}
}
}
c10::optional<Int::ScalarType> StatefulExpressionEvaluator::inferValue(
Val* value) {
FUSER_PERF_SCOPE("inferValue");
return maybeHandle(value);
}
void StatefulExpressionEvaluator::print() const {
std::cout << "\nEvaluation context\n";
std::cout << "--------------------\n";
for (const auto& kv : bindings_) {
std::cout << kv.first << " = " << kv.second;
if (kv.first->isConstScalar()) {
std::cout << " ; original value = "
<< kv.first->as<Int>()->value().value();
}
std::cout << " ; " << *kv.first->getValType() << "\n";
}
std::cout << "--------------------\n\n";
}
c10::optional<Int::ScalarType> StatefulExpressionEvaluator::getValue(
Val* value) {
TORCH_INTERNAL_ASSERT(
value->isAnInt(),
"Expressoin Evaluation does not support values other than integers at this time.");
switch (value->getValType().value()) {
case ValType::Scalar:
if (value->as<Int>()->value().has_value()) {
return value->as<Int>()->value();
}
break;
case ValType::KirScalar:
if (value->as<kir::Int>()->value().has_value()) {
return value->as<kir::Int>()->value();
}
break;
default:
break;
}
const auto it = bindings_.find(value);
return it != bindings_.end() ? c10::optional<Int::ScalarType>(it->second)
: c10::nullopt;
}
c10::optional<Int::ScalarType> StatefulExpressionEvaluator::maybeHandle(
Val* val) {
auto maybe_concrete_value = getValue(val);
if (!maybe_concrete_value.has_value()) {
auto origin = val->getOrigin();
if (origin != nullptr) {
handle(origin);
maybe_concrete_value = getValue(val);
}
}
return maybe_concrete_value;
}
void StatefulExpressionEvaluator::handle(UnaryOp* uop) {
const auto in = maybeHandle(uop->in());
if (in.has_value()) {
switch (uop->getUnaryOpType()) {
case UnaryOpType::Neg:
bindings_[uop->out()] = -*in;
break;
case UnaryOpType::Cast:
bindings_[uop->out()] = *in;
break;
default:
TORCH_CHECK(!"Unexpected operator type");
}
}
}
void StatefulExpressionEvaluator::handle(BinaryOp* bop) {
const auto lhs = maybeHandle(bop->lhs());
const auto rhs = maybeHandle(bop->rhs());
if (lhs.has_value() && rhs.has_value()) {
switch (bop->getBinaryOpType()) {
case BinaryOpType::Add:
bindings_[bop->out()] = *lhs + *rhs;
break;
case BinaryOpType::Sub:
bindings_[bop->out()] = *lhs - *rhs;
break;
case BinaryOpType::Mul:
bindings_[bop->out()] = *lhs * *rhs;
break;
case BinaryOpType::Div:
TORCH_CHECK(*rhs != 0);
bindings_[bop->out()] = *lhs / *rhs;
break;
case BinaryOpType::Mod:
TORCH_CHECK(*rhs != 0);
bindings_[bop->out()] = *lhs % *rhs;
break;
case BinaryOpType::CeilDiv:
TORCH_CHECK(*rhs != 0);
bindings_[bop->out()] = (*lhs + *rhs - 1) / *rhs;
break;
case BinaryOpType::And:
bindings_[bop->out()] = Int::ScalarType(*lhs && *rhs);
break;
default:
TORCH_CHECK(!"Unexpected operator type");
}
}
}
void StatefulExpressionEvaluator::handle(kir::UnaryOp* uop) {
const auto in = maybeHandle(uop->in());
if (in.has_value()) {
switch (uop->getUnaryOpType()) {
case UnaryOpType::Neg:
bindings_[uop->out()] = -*in;
break;
case UnaryOpType::Cast:
bindings_[uop->out()] = *in;
break;
default:
TORCH_CHECK(!"Unexpected operator type");
}
}
}
void StatefulExpressionEvaluator::handle(kir::BinaryOp* bop) {
const auto lhs = maybeHandle(bop->lhs());
const auto rhs = maybeHandle(bop->rhs());
if (lhs.has_value() && rhs.has_value()) {
switch (bop->getBinaryOpType()) {
case BinaryOpType::Add:
bindings_[bop->out()] = *lhs + *rhs;
break;
case BinaryOpType::Sub:
bindings_[bop->out()] = *lhs - *rhs;
break;
case BinaryOpType::Mul:
bindings_[bop->out()] = *lhs * *rhs;
break;
case BinaryOpType::Div:
TORCH_CHECK(*rhs != 0);
bindings_[bop->out()] = *lhs / *rhs;
break;
case BinaryOpType::Mod:
TORCH_CHECK(*rhs != 0);
bindings_[bop->out()] = *lhs % *rhs;
break;
case BinaryOpType::CeilDiv:
TORCH_CHECK(*rhs != 0);
bindings_[bop->out()] = (*lhs + *rhs - 1) / *rhs;
break;
case BinaryOpType::And:
bindings_[bop->out()] = Int::ScalarType(*lhs && *rhs);
break;
default:
TORCH_CHECK(!"Unexpected operator type");
}
}
}
} // namespace fuser
} // namespace jit
} // namespace torch
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